diff --git a/BUILD.gn b/BUILD.gn
index bafc121..dc28b54 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -13,9 +13,7 @@
     # Fuchsia has run_vm_tests marked testonly.
     testonly = true
   }
-  deps = [
-    ":runtime",
-  ]
+  deps = [ ":runtime" ]
   if (defined(checkout_llvm) && checkout_llvm) {
     deps += [ ":llvm_codegen" ]
   }
@@ -66,9 +64,7 @@
     # Fuchsia has run_vm_tests marked testonly.
     testonly = true
   }
-  deps = [
-    ":runtime",
-  ]
+  deps = [ ":runtime" ]
 }
 
 group("runtime_precompiled") {
@@ -80,59 +76,41 @@
 
 if (use_nnbd) {
   group("create_sdk") {
-    public_deps = [
-      "sdk_nnbd:create_sdk",
-    ]
+    public_deps = [ "sdk_nnbd:create_sdk" ]
   }
 } else {
   group("create_sdk") {
-    public_deps = [
-      "sdk:create_sdk",
-    ]
+    public_deps = [ "sdk:create_sdk" ]
   }
 }
 
 group("dart2js") {
-  deps = [
-    "utils/compiler:dart2js",
-  ]
+  deps = [ "utils/compiler:dart2js" ]
 }
 
 group("dartanalyzer") {
-  deps = [
-    "utils/dartanalyzer",
-  ]
+  deps = [ "utils/dartanalyzer" ]
 }
 
 group("dartdevc") {
-  deps = [
-    "utils/dartdevc",
-  ]
+  deps = [ "utils/dartdevc" ]
 }
 
 group("dartfmt") {
-  deps = [
-    "utils/dartfmt",
-  ]
+  deps = [ "utils/dartfmt" ]
 }
 
 group("dartfix") {
-  deps = [
-    "utils/dartfix",
-  ]
+  deps = [ "utils/dartfix" ]
 }
 
 group("analysis_server") {
-  deps = [
-    "utils/analysis_server",
-  ]
+  deps = [ "utils/analysis_server" ]
 }
 
 group("check_llvm") {
   if (defined(checkout_llvm) && checkout_llvm) {
-    deps = [
-      "runtime/llvm_codegen/test",
-    ]
+    deps = [ "runtime/llvm_codegen/test" ]
   }
 }
 
@@ -149,15 +127,11 @@
 # It must depend on anything that is required by the dart2js
 # test suites.
 group("dart2js_bot") {
-  deps = [
-    ":create_sdk",
-  ]
+  deps = [ ":create_sdk" ]
 }
 
 group("samples") {
-  deps = [
-    "runtime/bin:sample_extension",
-  ]
+  deps = [ "runtime/bin:sample_extension" ]
 }
 
 # This rule and the compressed_observatory_archive rule are for the Fuchsia
@@ -165,13 +139,9 @@
 # the root build output directory for convenient access by the Fuchsia buildbot
 # scripts.
 group("observatory_archive") {
-  deps = [
-    "runtime/observatory:copy_observatory_archive",
-  ]
+  deps = [ "runtime/observatory:copy_observatory_archive" ]
 }
 
 group("compressed_observatory_archive") {
-  deps = [
-    "runtime/observatory:copy_compressed_observatory_archive",
-  ]
+  deps = [ "runtime/observatory:copy_compressed_observatory_archive" ]
 }
diff --git a/build/config/android/BUILD.gn b/build/config/android/BUILD.gn
index c8c978a..d3775d7 100644
--- a/build/config/android/BUILD.gn
+++ b/build/config/android/BUILD.gn
@@ -8,9 +8,8 @@
 config("sdk") {
   if (sysroot != "") {
     cflags = [ "--sysroot=" + sysroot ]
-    ldflags = [
-      "--sysroot=" + rebase_path("$android_ndk_root/$android_sysroot_subdir"),
-    ]
+    ldflags = [ "--sysroot=" +
+                rebase_path("$android_ndk_root/$android_sysroot_subdir") ]
 
     # Need to get some linker flags out of the sysroot.
     sysroot_ld_path = rebase_path("//build/config/linux/sysroot_ld_path.py")
diff --git a/build/config/mac/rules.gni b/build/config/mac/rules.gni
index 54b5a6c..df8080e 100644
--- a/build/config/mac/rules.gni
+++ b/build/config/mac/rules.gni
@@ -12,17 +12,13 @@
   assert(defined(invoker.deps))
 
   action(target_name) {
-    sources = [
-      invoker.entitlements_path,
-    ]
+    sources = [ invoker.entitlements_path ]
 
     _application_path = invoker.application_path
 
     script = mac_app_script
 
-    outputs = [
-      "$_application_path/_CodeSignature/CodeResources",
-    ]
+    outputs = [ "$_application_path/_CodeSignature/CodeResources" ]
 
     args = [
       "codesign",
@@ -50,9 +46,7 @@
 
     invoker_out_dir = invoker.output_dir
 
-    outputs = [
-      "$root_build_dir/$invoker_out_dir/{{source_name_part}}.nib",
-    ]
+    outputs = [ "$root_build_dir/$invoker_out_dir/{{source_name_part}}.nib" ]
 
     args = [
       "nib",
@@ -80,9 +74,7 @@
   copy(target_name) {
     set_sources_assignment_filter([])
     sources = _resources
-    outputs = [
-      "$root_build_dir/$_app_name.app/$_bundle_directory/Contents/Resources/{{source_file_part}}",
-    ]
+    outputs = [ "$root_build_dir/$_app_name.app/$_bundle_directory/Contents/Resources/{{source_file_part}}" ]
 
     if (defined(invoker.deps)) {
       deps = invoker.deps
@@ -116,9 +108,7 @@
     script = mac_app_script
 
     sources = []
-    outputs = [
-      "$root_build_dir/$app_name.app",
-    ]
+    outputs = [ "$root_build_dir/$app_name.app" ]
 
     args = [
       "structure",
@@ -145,12 +135,8 @@
   action(plist_gen_target_name) {
     script = mac_app_script
 
-    sources = [
-      invoker.info_plist,
-    ]
-    outputs = [
-      "$root_build_dir/plist/$app_name/Info.plist",
-    ]
+    sources = [ invoker.info_plist ]
+    outputs = [ "$root_build_dir/plist/$app_name/Info.plist" ]
 
     args = [
       "plist",
@@ -165,32 +151,21 @@
 
   copy_plist_gen_target_name = target_name + "_plist_copy"
   copy(copy_plist_gen_target_name) {
-    sources = [
-      "$root_build_dir/plist/$app_name/Info.plist",
-    ]
+    sources = [ "$root_build_dir/plist/$app_name/Info.plist" ]
 
-    outputs = [
-      "$root_build_dir/$app_name.app/Contents/{{source_file_part}}",
-    ]
+    outputs = [ "$root_build_dir/$app_name.app/Contents/{{source_file_part}}" ]
 
-    deps = [
-      ":$plist_gen_target_name",
-    ]
+    deps = [ ":$plist_gen_target_name" ]
   }
 
   copy_bin_target_name = target_name + "_bin_copy"
   copy(copy_bin_target_name) {
-    sources = [
-      "$root_build_dir/$app_name",
-    ]
+    sources = [ "$root_build_dir/$app_name" ]
 
-    outputs = [
-      "$root_build_dir/$app_name.app/Contents/MacOS/{{source_file_part}}",
-    ]
+    outputs =
+        [ "$root_build_dir/$app_name.app/Contents/MacOS/{{source_file_part}}" ]
 
-    deps = [
-      ":$bin_gen_target_name",
-    ]
+    deps = [ ":$bin_gen_target_name" ]
   }
 
   copy_xib_target_name = target_name + "_xib_copy"
@@ -213,8 +188,6 @@
   # Top level group
 
   group(target_name) {
-    deps = [
-      ":$copy_all_target_name",
-    ]
+    deps = [ ":$copy_all_target_name" ]
   }
 }
diff --git a/build/config/sanitizers/BUILD.gn b/build/config/sanitizers/BUILD.gn
index 160545a..31e9cf2 100644
--- a/build/config/sanitizers/BUILD.gn
+++ b/build/config/sanitizers/BUILD.gn
@@ -8,9 +8,7 @@
 # shared_libraries. Unconditionally depend upon this target as it is empty if
 # |is_asan|, |is_lsan|, |is_tsan|, |is_msan| and |use_custom_libcxx| are false.
 group("deps") {
-  deps = [
-    "//third_party/instrumented_libraries:deps",
-  ]
+  deps = [ "//third_party/instrumented_libraries:deps" ]
   if (is_asan || is_lsan || is_msan || is_tsan || is_ubsan) {
     public_configs = [ ":sanitizer_options_link_helper" ]
     deps += [ ":options_sources" ]
@@ -44,9 +42,7 @@
     ":deps",
     "//:gn_visibility",
   ]
-  sources = [
-    "//build/sanitizers/sanitizer_options.cc",
-  ]
+  sources = [ "//build/sanitizers/sanitizer_options.cc" ]
 
   if (is_asan) {
     sources += [ "//build/sanitizers/asan_suppressions.cc" ]
diff --git a/build/config/sysroot.gni b/build/config/sysroot.gni
index 52a1b83..092022a 100644
--- a/build/config/sysroot.gni
+++ b/build/config/sysroot.gni
@@ -16,13 +16,17 @@
 
 if (is_linux && dart_use_debian_sysroot) {
   if (current_cpu == "x86") {
-    target_sysroot = rebase_path("//build/linux/debian_jessie_i386-sysroot", root_build_dir)
+    target_sysroot =
+        rebase_path("//build/linux/debian_jessie_i386-sysroot", root_build_dir)
   } else if (current_cpu == "x64") {
-    target_sysroot = rebase_path("//build/linux/debian_jessie_amd64-sysroot", root_build_dir)
+    target_sysroot =
+        rebase_path("//build/linux/debian_jessie_amd64-sysroot", root_build_dir)
   } else if (current_cpu == "arm") {
-    target_sysroot = rebase_path("//build/linux/debian_jessie_arm-sysroot", root_build_dir)
+    target_sysroot =
+        rebase_path("//build/linux/debian_jessie_arm-sysroot", root_build_dir)
   } else if (current_cpu == "arm64") {
-    target_sysroot = rebase_path("//build/linux/debian_jessie_arm64-sysroot", root_build_dir)
+    target_sysroot =
+        rebase_path("//build/linux/debian_jessie_arm64-sysroot", root_build_dir)
   } else {
     print("There is no Debian sysroot present for $current_cpu")
     assert(false)
diff --git a/build/config/templates/templates.gni b/build/config/templates/templates.gni
index 72d09c0..cd310ce 100644
--- a/build/config/templates/templates.gni
+++ b/build/config/templates/templates.gni
@@ -38,9 +38,7 @@
     script = "//build/android/gyp/jinja_template.py"
     depfile = "$target_gen_dir/$target_name.d"
 
-    sources = [
-      invoker.input,
-    ]
+    sources = [ invoker.input ]
     outputs = [
       invoker.output,
       depfile,
diff --git a/build/dart/copy_tree.gni b/build/dart/copy_tree.gni
index 580d711..a17e529 100644
--- a/build/dart/copy_tree.gni
+++ b/build/dart/copy_tree.gni
@@ -74,14 +74,14 @@
   foreach(copy_tree_spec, sources) {
     copy_tree_source_paths += [
       rebase_path(copy_tree_spec.source),
-      copy_tree_spec.ignore_patterns
+      copy_tree_spec.ignore_patterns,
     ]
   }
 
   # Evaluate script output as GN, producing a scope containing a single value
   # "sources"
   copy_tree_inputs_scope = exec_script("$_dart_root/tools/copy_tree.py",
-                                       ["--gn"] + copy_tree_source_paths,
+                                       [ "--gn" ] + copy_tree_source_paths,
                                        "scope")
 
   # A list of lists of input source files for copy_tree.
diff --git a/build/dart/dart_action.gni b/build/dart/dart_action.gni
index 8fa5e57..2058f033 100644
--- a/build/dart/dart_action.gni
+++ b/build/dart/dart_action.gni
@@ -74,9 +74,7 @@
     # Add the executable itself as an input.
     inputs += [ host_executable ]
 
-    deps = [
-      host_tool,
-    ]
+    deps = [ host_tool ]
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
diff --git a/build/dart/prebuilt_dart_sdk.gni b/build/dart/prebuilt_dart_sdk.gni
index bdb9ebf..906822e 100644
--- a/build/dart/prebuilt_dart_sdk.gni
+++ b/build/dart/prebuilt_dart_sdk.gni
@@ -12,7 +12,12 @@
 # When the first argument is "exec_script", gn_run_binary.py always exits with
 # status 0, but gives non-empty output when the command it is given fails.
 _prebuilt_dart_exe_trial = exec_script("../gn_run_binary.py",
-    ["exec_script", _prebuilt_dart_exe, "--version"], "string")
+                                       [
+                                         "exec_script",
+                                         _prebuilt_dart_exe,
+                                         "--version",
+                                       ],
+                                       "string")
 if (_prebuilt_dart_exe_trial == "") {
   prebuilt_dart_exe_works = true
 } else {
diff --git a/build/rust/rust.gni b/build/rust/rust.gni
index 6b4caf1..caabcc8 100644
--- a/build/rust/rust.gni
+++ b/build/rust/rust.gni
@@ -11,8 +11,10 @@
   cmd = [
     rebase_path("//buildtools/${current_os}-${current_cpu}/rust/bin/cargo"),
     "build",
-    "--target-dir", rebase_path(target_out_dir),
-    "--manifest-path", manifest,
+    "--target-dir",
+    rebase_path(target_out_dir),
+    "--manifest-path",
+    manifest,
   ]
   output = "$target_out_dir/lib${invoker.lib_name}.a"
   debug = defined(invoker.debug) && invoker.debug
diff --git a/build/sanitizers/BUILD.gn b/build/sanitizers/BUILD.gn
index 4f81f3e..f90faa5 100644
--- a/build/sanitizers/BUILD.gn
+++ b/build/sanitizers/BUILD.gn
@@ -6,19 +6,13 @@
   # TODO(GYP): Figure out which of these work and are needed on other platforms.
   copy("copy_llvm_symbolizer") {
     if (is_win) {
-      sources = [
-        "//third_party/llvm-build/Release+Asserts/bin/llvm-symbolizer.exe",
-      ]
-      outputs = [
-        "$root_out_dir/llvm-symbolizer.exe",
-      ]
+      sources =
+          [ "//third_party/llvm-build/Release+Asserts/bin/llvm-symbolizer.exe" ]
+      outputs = [ "$root_out_dir/llvm-symbolizer.exe" ]
     } else {
-      sources = [
-        "//third_party/llvm-build/Release+Asserts/bin/llvm-symbolizer",
-      ]
-      outputs = [
-        "$root_out_dir/llvm-symbolizer",
-      ]
+      sources =
+          [ "//third_party/llvm-build/Release+Asserts/bin/llvm-symbolizer" ]
+      outputs = [ "$root_out_dir/llvm-symbolizer" ]
     }
   }
 }
diff --git a/build/secondary/third_party/android_tools/BUILD.gn b/build/secondary/third_party/android_tools/BUILD.gn
index 5f803c9..8f0799c 100644
--- a/build/secondary/third_party/android_tools/BUILD.gn
+++ b/build/secondary/third_party/android_tools/BUILD.gn
@@ -16,13 +16,12 @@
 }
 
 source_set("cpu_features") {
-  sources = [
-    "$android_ndk_root/sources/android/cpufeatures/cpu-features.c",
-  ]
+  sources = [ "$android_ndk_root/sources/android/cpufeatures/cpu-features.c" ]
   public_configs = [ ":cpu_features_include" ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     "//build/config/compiler:no_chromium_code",
+
     # Must be after no_chromium_code for warning flags to be ordered correctly.
     ":cpu_features_warnings",
   ]
diff --git a/build/toolchain/android/BUILD.gn b/build/toolchain/android/BUILD.gn
index 8568ef7..123c9c4 100644
--- a/build/toolchain/android/BUILD.gn
+++ b/build/toolchain/android/BUILD.gn
@@ -4,8 +4,8 @@
 
 import("//build/config/sysroot.gni")  # Imports android/config.gni.
 import("//build/toolchain/ccache.gni")
-import("//build/toolchain/goma.gni")
 import("//build/toolchain/gcc_toolchain.gni")
+import("//build/toolchain/goma.gni")
 
 # The Android GCC toolchains share most of the same parameters, so we have this
 # wrapper around gcc_toolchain to avoid duplication of logic.
diff --git a/build/toolchain/gcc_toolchain.gni b/build/toolchain/gcc_toolchain.gni
index 3689187..0d74966 100644
--- a/build/toolchain/gcc_toolchain.gni
+++ b/build/toolchain/gcc_toolchain.gni
@@ -101,9 +101,8 @@
       command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "CC {{output}}"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
+      outputs =
+          [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
     }
 
     tool("cxx") {
@@ -111,9 +110,8 @@
       command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "CXX {{output}}"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
+      outputs =
+          [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
     }
 
     tool("asm") {
@@ -122,9 +120,8 @@
       command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{asmflags}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "ASM {{output}}"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
+      outputs =
+          [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
     }
 
     tool("alink") {
@@ -132,9 +129,8 @@
       command = "rm -f {{output}} && $ar rcs {{output}} @$rspfile"
       description = "AR {{output}}"
       rspfile_content = "{{inputs}}"
-      outputs = [
-        "{{target_out_dir}}/{{target_output_name}}{{output_extension}}",
-      ]
+      outputs =
+          [ "{{target_out_dir}}/{{target_output_name}}{{output_extension}}" ]
       default_output_extension = ".a"
       output_prefix = "lib"
     }
@@ -208,8 +204,7 @@
         command += " && " + strip_command
       } else if (defined(invoker.llvm_objcopy)) {
         strip = invoker.llvm_objcopy
-        strip_command =
-            "${strip} --strip-all $outfile $stripped_outfile"
+        strip_command = "${strip} --strip-all $outfile $stripped_outfile"
         command += " && " + strip_command
       }
       if (defined(invoker.postlink)) {
@@ -217,9 +212,7 @@
       }
       description = "LINK $outfile"
       rspfile_content = "{{inputs}}"
-      outputs = [
-        outfile,
-      ]
+      outputs = [ outfile ]
       if (defined(invoker.strip) || defined(invoker.llvm_objcopy)) {
         outputs += [ stripped_outfile ]
       }
diff --git a/build/toolchain/mac/BUILD.gn b/build/toolchain/mac/BUILD.gn
index ef4b8a5..48ef702 100644
--- a/build/toolchain/mac/BUILD.gn
+++ b/build/toolchain/mac/BUILD.gn
@@ -6,13 +6,13 @@
 # some enhancements since the commands on Mac are slightly different than on
 # Linux.
 
-import("../goma.gni")
 import("//build/config/mac/mac_sdk.gni")
+import("../goma.gni")
 
 assert(host_os == "mac")
 
-import("//build/toolchain/goma.gni")
 import("//build/config/sysroot.gni")
+import("//build/toolchain/goma.gni")
 
 if (use_goma) {
   goma_prefix = "$goma_dir/gomacc "
@@ -61,9 +61,8 @@
       command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} $sysroot_flags $toolchain_flags {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "CC {{output}}"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
+      outputs =
+          [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
     }
 
     tool("cxx") {
@@ -71,9 +70,8 @@
       command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} $sysroot_flags $toolchain_flags {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "CXX {{output}}"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
+      outputs =
+          [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
     }
 
     tool("asm") {
@@ -82,9 +80,8 @@
       command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} $sysroot_flags $toolchain_flags {{asmflags}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "ASM {{output}}"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
+      outputs =
+          [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
     }
 
     tool("objc") {
@@ -92,9 +89,8 @@
       command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} $sysroot_flags $toolchain_flags {{cflags}} {{cflags_c}} {{cflags_objc}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "OBJC {{output}}"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
+      outputs =
+          [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
     }
 
     tool("objcxx") {
@@ -102,9 +98,8 @@
       command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} $sysroot_flags $toolchain_flags {{cflags}} {{cflags_cc}} {{cflags_objcc}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "OBJCXX {{output}}"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
+      outputs =
+          [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
     }
 
     tool("alink") {
@@ -112,15 +107,15 @@
       command = "rm -f {{output}} && $ar rcs {{output}} @$rspfile"
       description = "AR {{output}}"
       rspfile_content = "{{inputs}}"
-      outputs = [
-        "{{target_out_dir}}/{{target_output_name}}{{output_extension}}",
-      ]
+      outputs =
+          [ "{{target_out_dir}}/{{target_output_name}}{{output_extension}}" ]
       default_output_extension = ".a"
       output_prefix = "lib"
     }
 
     tool("solink") {
-      dylib = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"  # eg "./libfoo.dylib"
+      dylib = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"  # eg
+                                                                             # "./libfoo.dylib"
       rspfile = dylib + ".rsp"
 
       # These variables are not build into GN but are helpers that implement
@@ -185,9 +180,7 @@
 
       description = "LINK $outfile"
       rspfile_content = "{{inputs_newline}}"
-      outputs = [
-        outfile,
-      ]
+      outputs = [ outfile ]
       if (defined(invoker.strip)) {
         outputs += [ stripped_outfile ]
       }
diff --git a/build/toolchain/win/BUILD.gn b/build/toolchain/win/BUILD.gn
index ea348b68..a053de1 100644
--- a/build/toolchain/win/BUILD.gn
+++ b/build/toolchain/win/BUILD.gn
@@ -138,9 +138,10 @@
     }
 
     tool("solink") {
-      dllname = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"  # e.g. foo.dll
-      libname =
-          "{{root_out_dir}}/{{target_output_name}}{{output_extension}}.lib"  # e.g. foo.dll.lib
+      dllname = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"  # e.g.
+                                                                               # foo.dll
+      libname = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}.lib"  # e.g.
+                                                                                   # foo.dll.lib
       rspfile = "${dllname}.rsp"
 
       link_command = "$python_path $tool_wrapper_path link-wrapper $env False link.exe /nologo /IMPLIB:$libname /DLL /OUT:$dllname /PDB:${dllname}.pdb @$rspfile"
@@ -165,7 +166,9 @@
     }
 
     tool("solink_module") {
-      dllname = "{{output_dir}}/{{target_output_name}}{{output_extension}}"  # e.g. foo.dll
+      dllname =
+          "{{output_dir}}/{{target_output_name}}{{output_extension}}"  # e.g.
+                                                                       # foo.dll
       pdbname = "${dllname}.pdb"
       rspfile = "${dllname}.rsp"
 
diff --git a/docs/process/language-versions-and-experiments.md b/docs/process/language-versions-and-experiments.md
new file mode 100644
index 0000000..54f83ad
--- /dev/null
+++ b/docs/process/language-versions-and-experiments.md
@@ -0,0 +1,363 @@
+# Language Versioning and Experiments
+
+This document explains our model for how to language versioning and experiment
+flags interact, and the processes we use to work with them. The key principles:
+
+*   Every major and minor (".0") release of the SDK creates a new language
+    version. A shipped language version's semantics are entirely fixed by how it
+    behaves in that version of the SDK.
+
+*   At any point in time, there is an "in-progress" language version with a
+    family of related languages, one for each combination of experiments.
+
+*   Language versioning, experiment flags, and other magic for handling the core
+    libraries and special packages like Flutter all boil down to mechanisms to
+    select which of these many languages a given library wants to target.
+
+## Language Versions
+
+There is an ordered series of shipped language versions, 2.5, 2.6, etc. Each one
+is a different language. They may be mutually incompatible (in practice they are
+mostly compatible). Each Dart library targets&mdash;is "written in"&mdash;a
+*single* version of the language. (We'll get to how they target one soon.)
+Programs may contain libraries written in a variety of languages, and a Dart SDK
+supports multiple different Dart versions simultaneously.
+
+Each time we ship a major or minor stable release of the SDK, the corresponding
+language version gets carved in stone. The day we shipped Dart 2.5.0, we
+henceforth and forevermore declared that there is only one Dart 2.5, and it
+refers to the first Dart version that supports the "constant update" changes.
+
+As of today, the 2.5, 2.6, and 2.7 language versions are all locked down.
+
+Patch releases, like 2.5.1, do not introduce new language versions. Both Dart
+SDK 2.5.0 and 2.5.1 contain language version 2.5. This implies that we cannot
+ship breaking language changes in patch releases. Doing so would spontaneously
+break any user whose library already targeted that language version.
+
+### "In-progress" version
+
+At any point in time, there is also an **in-progress language version.** It
+corresponds to the current dev build or (equivalently) the next stable version
+to be released. Today's current in-progress language version is 2.8 because we
+have shipped 2.7.1 and have not yet shipped 2.8.0.
+
+Unlike the previous stable releases, the in-progress version is not carved in
+stone. As we develop the SDK, its behavior may change.
+
+### Experimental languages
+
+The in-progress version is not alone. Hanging off it are a family of sibling
+**experimental languages.** Each one corresponds to a specific combination of
+experiment flags. While there is only one Dart 2.7, there are several Dart 2.8s:
+
+*   "2.8": The Dart you get right now on bleeding edge with no experiments enabled.
+
+*   "2.8+non-nullable": The same but with the "non-nullable" experiment enabled.
+
+*   "2.8+variance": Likewise but with "variance" instead.
+
+*   "2.8+non-nullable+variance": Both "non-nullable" and "variance" experiments.
+
+All of these languages exist simultaneously and in parallel. Dart 2.6, Dart 2.7,
+Dart 2.8, and Dart 2.8+non-nullable, etc. all *are* in some sense. They have
+(sometimes incomplete) specs. There are tools that implement them. Think of each
+as a different language with its own name, syntax, and semantics.
+
+Don't think of an experiment flag as "turning on a feature". The feature is
+there, it's just in some other language. The only question is which libraries
+want to go over there and use it.
+
+You can visualize the space of different flavors of Dart something like this:
+
+```
+┌──────── shipped ─────────┐ ┌─ in-progress ─────────────┐
+older... ┄─ 2.5 ─ 2.6 ─ 2.7 ─ 2.8
+                               │
+           ┌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┐  2.8+non-nullable
+           ╎               ╎   │
+           ╎      no       ╎  2.8+variance
+           ╎   languages   ╎   │
+           ╎    here...    ╎  2.8+triple-shift
+           ╎               ╎   │
+           ╎               ╎  2.8+non-nullable+variance
+           └╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┘   │
+                               ┆
+                              other experiment combinations...
+```
+
+There is a line of numeric languages for all of the shipped stable versions of
+Dart, receding back into history. Then there is a single in-progress version and
+next to it are all of the various combinations of experiments. There are no
+other languages. In particular, there are no combinations of "shipped version +
+experiment". **You cannot "enable an experiment" in a library targeting a shipped
+version of the language.**
+
+## Selecting a Language
+
+This is the fundamental concept: there are a variety of different Dart languages
+for various versions and combinations of experimental in-progress features.
+Everything else is just a mechanism for users to select *which* of these
+languages they use.
+
+The first part to picking a language for a library is picking the numeric part.
+The language versioning spec defines how that works. For completeness' sake, the
+basic rules are (in priority order):
+
+1.  A comment like `// @dart=2.5` selects that (numeric) version for the library.
+
+2.  For other libraries in a package, the "package_config.json" file specifies
+    their language version. This file is generated by pub from the SDK
+    constraints in the pubspecs of the various packages the user is using.
+
+3.  If a package does not specify an SDK constraint, then pub doesn't put a
+    language version in the "package_config.json" for that file. In that case,
+    libraries in that package default to the "current SDK" version.
+
+4.  Likewise, any library not part of a package defaults to the "current SDK"
+    version.
+
+### SDK version &rarr; Language version
+
+The "current SDK version" is generally the semver version you get when you run
+one of the various Dart tools with `--version`.
+
+To convert that three-component semver SDK version to a major.minor language
+version, use this rule: **The language version of an SDK is the major and minor
+version of the version reported by tools in that SDK.** This means that:
+
+*   Stable releases of the Dart SDK have the language version you expect: Dart
+    2.5.3's language version is 2.5.
+
+*   Dev and bleeding edge releases have the language version of the upcoming
+    stable release. On my machine today, `dart --version` reports
+    "2.8.0-edge.a38…", which means its language version is "2.8". In other
+    words, **the default language version of non-stable versions of the SDK is
+    the in-progress language.**
+
+Internally in the Dart SDK repo, the source of truth for the SDK version number
+is `tools/VERSION`. That file gets updated during the release process when
+various branches are cut and releases shipped. We could calculate the language
+version from that using the above rule, but we're worried that that means the
+language version could change inadvertently as a consequence of release
+administrivia. Instead, the repo stores the language version explicitly in
+`tools/experimental_features.yaml`.
+
+In theory this means the SDK's reported version can get out of sync with its
+language version. In practice, slippage should be rare and only visible to users
+building the Dart SDK on bleeding edge.
+
+### SDK constraint &rarr; Language version
+
+The rule to convert an SDK constraint to a language is: **The default language
+version used by a package is the language version of its SDK constraint's
+minimum version.** Thus the following SDK constraints yield these language
+versions:
+
+*   `>=2.6.0 <3.0.0` &rarr; 2.6
+
+*   `>=2.6.3 <3.0.0` &rarr; 2.6 (still on 2.6)
+
+*   `>=2.7.1 <3.0.0` &rarr; 2.7 (still on 2.7)
+
+*   `>=2.8.0-dev.1 <3.0.0` &rarr; (2.8, in-progress version)
+
+This rule lets users target language versions that exist only in dev releases.
+It also lets them use a patch version as their minimum version in order to get
+bug fixes or core library changes.
+
+## Experiment Flags
+
+Language versioning and the above section cover cases where you just want your
+library to get onto a specific numeric language version like 2.7, even including
+the current in-progress version 2.8. But what if you want to play with some
+experimental in-progress features? For that, you need to get onto one of the
+experimental sibling languages of the in-progress version. You get there by
+passing experiment flags to the various tools (and in their
+`analysis_options.yaml` file).
+
+This is *all* the experiment flags do. Passing a set of experiment flags to a
+Dart tool means **Treat every user library using the in-progress language as
+using the given experimental language instead.**
+
+"User library" means libraries authored by normal Dart users outside of the Dart
+and Flutter teams who may have some special powers described below.
+
+"Using the in-progress language" means this rule only comes into play for the
+in-progress language. Today, passing the "non-nullable" flag shunts every user
+library targeting 2.8 over to 2.8+non-nullable, but has no effect on any library
+targeting 2.7 or older. *There is no such thing as 2.7+non-nullable.* The day
+2.7.0 shipped, 2.7 got locked down and all of the experimental versions
+surrounding it evaporated, to be replaced by a new set of experimental languages
+surrounding the new in-progress version 2.8.
+
+Shipping a version of the SDK and language does not imply that all experiment
+flags that exist at that point automatically get turned on in that version. Many
+language changes gated behind experiment flags float through several releases
+before finally becoming ready to ship. The "non-nullable" and "variance"
+experiments existed before we shipped 2.7.0 and still exist today.
+
+When a new version of the SDK is released, unless an experimental feature is
+deliberately "shipped" (meaning the behavior is turned on by default and the
+flag goes away), the flag simply carries forward as an experimental feature in
+the next in-progress version. So the day we shipped Dart 2.7.0, "variance"
+ceased to be a flag that affects Dart 2.7 and instead became a flag that affects
+Dart 2.8.
+
+### Experiment flags are global across all user libraries
+
+Note that passing an experiment flag moves *all* in-progress version user
+libraries onto that experimental language. If you pass "non-nullable", all of
+your 2.8 libraries *and every 2.8 library in every package you use* instantly
+starts targeting 2.8+non-nullable. We support mixed-mode Dart programs
+consisting of libraries using a variety of *shipped* versions like 2.7 and 2.6.
+You can even mix them with *one* in-progress version like 2.8 or
+2.8+non-nullable.
+
+We do *not* support user programs that are arbitrary combinations of
+*experimental* languages. We don't want to have to define or implement what it
+means to have, for example, a 2.8+variance library importing a 2.8+non-nullable
+library and extending a generic class from it. Combinations of combinations is a
+path to madness.
+
+We may internally allow some mixture to occur because of things like core
+libraries (see below), but that's because we can carefully control what code is
+in that weird state. We do not want to let *users* write programs that mix
+different experimental languages. If you have some user library that you don't
+want to be affected by an experiment you are playing with, make sure that
+library is not on the in-progress version.
+
+### SDK core libraries and other special friends
+
+Experiment flags are *a* way to shift a library from the in-progress version
+over to one of its experimental siblings, but not the only way. Remember, all
+experimental flavors of the in-progress version exist simultaneously. Experiment
+flags are primarily intended to let *users* opt their libraries into one of
+those experimental languages.
+
+We on the Dart team have our own special powers. The migrated SDK core libraries
+do not need the user to pass any experiment flag to move them into
+2.8+non-nullable. Our tools know to do that automatically when compiling those
+particular libs. Likewise, when Flutter (and a couple of packages like
+vector_math that it exports from its API) migrate, we can also use whitelists or
+other special sauce to move them into 2.8+non-nullable.
+
+However, all those libraries do need to take care to select the right *numeric*
+version. Because, again, there is no such thing as 2.7+non-nullable. So if, say,
+a core lib doesn't get marked as 2.8, it ain't gonna be 2.8+non-nullable. Dart's
+"language versioning" support is how libraries do that.
+
+## Using Null Safety
+
+OK, so let's put that all together to see how someone goes about being able to
+use `?` and `late` in their library today.
+
+1.  You must be running on a dev or bleeding edge build of the SDK. No stable
+    release of Dart has support for any language later than 2.7.
+
+2.  Tell Dart that your libraries should be treated as 2.8. In the core libs,
+    we've been using the version comments and/or some hardcoding. In a package,
+    you can set the SDK constraint to:
+
+    ```yaml
+    environment:
+      sdk: >=2.8.0-dev.0 <2.8.0
+    ```
+
+    *SDK min constraint:* You can require a higher dev release if you want. The
+    important part is that the minimum is at least *a dev version of 2.8.0*. You
+    could also omit the SDK constraint completely. That works OK for application
+    packages but not for library packages since pub will not let you publish a
+    package without an SDK constraint.
+
+    SDK max constraint: The relatively low max version gives us some wiggle room
+    to break things before 2.8.0. I don't know if it's wise to claim that a
+    package we publish right now will keep working all the way through, say,
+    3.0.0. It's not strictly necessary. Everything in this doc still works if
+    you do <3.0.0
+
+3.  Tell your Dart compiler to shunt all version 2.8 user libraries over to
+    2.8+non-nullable by passing `--enable-experiment=non-nullable` when you
+    invoke the tool. Put something similar in your `analysis_options.yaml` file
+    for IDE goodness. See the [experimental flags doc][] for details.
+
+That's it. Now you have a library that Dart tools know targets 2.8+non-nullable,
+at least today.
+
+[experimental flags doc]: https://github.com/dart-lang/sdk/blob/master/docs/process/experimental-flags.md
+
+### 2.8.0 ships without null safety
+
+Let's say we ship Dart 2.8.0 stable and it does not include stable support for null safety. That means null safety is still behind the "non-nullable" flag. What happens?
+
+The day this happens, 2.8 is no longer an "in-progress" language version. It has
+become carved in stone and that language version refers to exactly the behavior
+shipped by that SDK. All of the 2.8 experimental versions disappear. The
+experiment flags no longer affect libraries using language 2.8. Instead, at that
+exact same moment, a new 2.9 in-progress version appears. Any flags that we
+didn't ship and carried forward now apply to that. So there is 2.9+non-nullable,
+2.9+variance, etc.
+
+This closing of 2.8 and opening of 2.9 implies several things:
+
+*   **Any library targeting 2.8 and using null safety features needs to have its
+    language version changed to target 2.9.** This can mean changing a ``//
+    @dart=2.8` comment or bumping the minimum SDK constraint in the pubspec.
+
+*   **In the 2.8.0 stable SDK that we just shipped, the language version for the
+    core libraries must be 2.9.** They must be because they use null safety
+    features, which can no longer be enabled for 2.8 libraries. This seems
+    weird. How can 2.8.0 support a *future* version of Dart? The reality is that
+    2.8.0 has secret *internal* support for some subset of 2.9 that we know the
+    core libraries happen to fit within. It's an implementation detail that
+    those core libraries happen to use capabilities within the SDK that we don't
+    expose externally yet. It's strange, but I think should be OK.
+
+*   **Any packages needed by Flutter for users to play with null safety after
+    2.8.0 ships need to have min SDK constraints above 2.8.0.** They need to get
+    to language level 2.9, and the only way to do that is with a constraint that
+    excludes 2.8.0. But if users are running on Dart 2.8.0 stable, Pub won't
+    select any of those packages because 2.8.0 is outside of their SDK
+    constraint!
+
+    This is a real problem, a consequence of using SDK constraints to control
+    *both* language version and package resolution. To address this, shortly after
+    shipping the stable build, we will also ship a Dart 2.9.0-dev.0 dev release
+    and roll that into Flutter's dev channel. Anyone who wants to experiment
+    with non-nullability needs to be on the dev channel. Null-safety is still an
+    experimental feature, and the point of stable releases is to be, well,
+    stable. If you want to experiment with experimental features, get yourself
+    on dev channel.
+
+### 2.10.0 ships with null safety
+
+Then let's say we finally ship null safety officially in 2.10.0. Every package
+out there playing with the null safety experiment has already revved its minimum
+SDK constraint to something like `>=2.10.0-dev.0`. What happens next?
+
+*   **If the SDK constraint is like `>=2.10.0-dev.0 <2.10.0`, they just need to
+    raise that to include 2.10.0.** This path is the safe choice because it's
+    risky to assume the next stable release will be compatible with preceding
+    in-progress dev builds. The point of dev builds is that they are in flux. So
+    most packages using null safety should be in this state. Once we ship null
+    safety, we just need to raise their max SDK constraints to include 2.10.0
+    after verifying that the package still works with the stable release.
+
+*   **If the SDK constraint is like `>=2.10.0-dev.0 <3.0.0` the package author
+    has nothing to do.** The package claims to support both the previous dev
+    versions of null safety and the shipped stable version. A constraint like
+    this is dubious because we reserve the right to make arbitrary breaking
+    changes to features that are gated behind experiment flags. But if the
+    package author is confident that no breakage has or will happen (likely
+    because said "author" is a member of the Dart team), a wide constraint like
+    this *can* be reasonable. And, in that case the package keeps working. It's
+    already on language 2.10 and 2.10 now supports null safety out of the box.
+    There's nothing to do.
+
+*   **If the SDK constraint is like `>=2.8.0 <3.0.0`, the package is on a
+    previous "legacy" language version.** The package has "opted out of NNBD"
+    and keeps working like it did before.
+
+There's nothing special about "2.10.0" in this scenario. Whenever we choose to
+ship an experimental feature, in whatever version, this is how it should play
+out regarding packages.
diff --git a/pkg/BUILD.gn b/pkg/BUILD.gn
index bd7eb4c..173b32f 100644
--- a/pkg/BUILD.gn
+++ b/pkg/BUILD.gn
@@ -55,9 +55,7 @@
 
   inputs = stamp0_outputs + stamp1_outputs + stamp2_outputs + stamp3_outputs
 
-  outputs = [
-    "$root_gen_dir/pkg_files.stamp",
-  ]
+  outputs = [ "$root_gen_dir/pkg_files.stamp" ]
 
   script = "../tools/create_timestamp_file.py"
   args = [ rebase_path("$root_gen_dir/pkg_files.stamp") ]
diff --git a/pkg/_fe_analyzer_shared/analysis_options_no_lints.yaml b/pkg/_fe_analyzer_shared/analysis_options_no_lints.yaml
index a3e66b0..0ba9195 100644
--- a/pkg/_fe_analyzer_shared/analysis_options_no_lints.yaml
+++ b/pkg/_fe_analyzer_shared/analysis_options_no_lints.yaml
@@ -9,6 +9,7 @@
   exclude:
     - test/flow_analysis/assigned_variables/data/**
     - test/flow_analysis/definite_assignment/data/**
+    - test/flow_analysis/definite_unassignment/data/**
     - test/flow_analysis/nullability/data/**
     - test/flow_analysis/reachability/data/**
     - test/flow_analysis/type_promotion/data/**
diff --git a/pkg/_fe_analyzer_shared/lib/src/flow_analysis/flow_analysis.dart b/pkg/_fe_analyzer_shared/lib/src/flow_analysis/flow_analysis.dart
index 60eb94d..d715141 100644
--- a/pkg/_fe_analyzer_shared/lib/src/flow_analysis/flow_analysis.dart
+++ b/pkg/_fe_analyzer_shared/lib/src/flow_analysis/flow_analysis.dart
@@ -513,6 +513,10 @@
   void isExpression_end(
       Expression isExpression, Expression subExpression, bool isNot, Type type);
 
+  /// Return whether the [variable] is definitely unassigned in the current
+  /// state.
+  bool isUnassigned(Variable variable);
+
   /// Call this method after visiting the RHS of a logical binary operation
   /// ("||" or "&&").
   /// [wholeExpression] should be the whole logical binary expression.
@@ -928,6 +932,12 @@
   }
 
   @override
+  bool isUnassigned(Variable variable) {
+    return _wrap('isUnassigned($variable)', () => _wrapped.isAssigned(variable),
+        isQuery: true);
+  }
+
+  @override
   void logicalBinaryOp_end(Expression wholeExpression, Expression rightOperand,
       {@required bool isAnd}) {
     _wrap(
@@ -1174,6 +1184,31 @@
   VariableModel<Type> infoFor(Variable variable) =>
       variableInfo[variable] ?? _freshVariableInfo;
 
+  /// Updates the state to indicate that variables that are not definitely
+  /// unassigned in the [other] are also not definitely unassigned in the
+  /// result.
+  FlowModel<Variable, Type> joinUnassigned(FlowModel<Variable, Type> other) {
+    Map<Variable, VariableModel<Type>> newVariableInfo;
+
+    for (Variable variable in other.variableInfo.keys) {
+      VariableModel<Type> otherInfo = other.variableInfo[variable];
+      if (otherInfo.unassigned) continue;
+
+      VariableModel<Type> info = variableInfo[variable];
+      if (info == null) continue;
+
+      VariableModel<Type> newInfo = info.markNotUnassigned();
+      if (identical(newInfo, info)) continue;
+
+      (newVariableInfo ??= new Map<Variable, VariableModel<Type>>.from(
+          variableInfo))[variable] = newInfo;
+    }
+
+    if (newVariableInfo == null) return this;
+
+    return FlowModel<Variable, Type>._(reachable, newVariableInfo);
+  }
+
   /// Updates the state to indicate that the given [writtenVariables] are no
   /// longer promoted; they are presumed to have their declared types.
   ///
@@ -1209,7 +1244,7 @@
       if (info == null) {
         (newVariableInfo ??= new Map<Variable, VariableModel<Type>>.from(
                 variableInfo))[variable] =
-            new VariableModel<Type>(null, const [], false, true);
+            new VariableModel<Type>(null, const [], false, false, true);
       } else if (!info.writeCaptured) {
         (newVariableInfo ??= new Map<Variable, VariableModel<Type>>.from(
             variableInfo))[variable] = info.writeCapture();
@@ -1382,7 +1417,7 @@
         : _updateVariableInfo(
             variable,
             new VariableModel<Type>(info.promotedTypes, newTested,
-                info.assigned, info.writeCaptured));
+                info.assigned, info.unassigned, info.writeCaptured));
     FlowModel<Variable, Type> modelIfSuccessful =
         identical(newPromotedTypes, info.promotedTypes) &&
                 identical(newTested, info.tested)
@@ -1390,7 +1425,7 @@
             : _updateVariableInfo(
                 variable,
                 new VariableModel<Type>(newPromotedTypes, newTested,
-                    info.assigned, info.writeCaptured));
+                    info.assigned, info.unassigned, info.writeCaptured));
     return new ExpressionInfo<Variable, Type>(
         this, modelIfSuccessful, modelIfFailed);
   }
@@ -1549,14 +1584,21 @@
   /// Indicates whether the variable has definitely been assigned.
   final bool assigned;
 
+  /// Indicates whether the variable is unassigned.
+  final bool unassigned;
+
   /// Indicates whether the variable has been write captured.
   final bool writeCaptured;
 
-  VariableModel(
-      this.promotedTypes, this.tested, this.assigned, this.writeCaptured) {
+  VariableModel(this.promotedTypes, this.tested, this.assigned, this.unassigned,
+      this.writeCaptured) {
+    assert(!(assigned && unassigned),
+        "Can't be both definitely assigned and unassigned");
     assert(promotedTypes == null || promotedTypes.isNotEmpty);
     assert(!writeCaptured || promotedTypes == null,
         "Write-captured variables can't be promoted");
+    assert(!(writeCaptured && unassigned),
+        "Write-captured variables can't be definitely unassigned");
     assert(tested != null);
   }
 
@@ -1566,22 +1608,33 @@
       : promotedTypes = null,
         tested = const [],
         assigned = false,
+        unassigned = true,
         writeCaptured = false;
 
   /// Returns a new [VariableModel] in which any promotions present have been
   /// dropped.
   VariableModel<Type> discardPromotions() {
     assert(promotedTypes != null, 'No promotions to discard');
-    return new VariableModel<Type>(null, tested, assigned, writeCaptured);
+    return new VariableModel<Type>(
+        null, tested, assigned, unassigned, writeCaptured);
   }
 
   /// Returns a new [VariableModel] reflecting the fact that the variable was
   /// just initialized.
   VariableModel<Type> initialize() {
-    if (promotedTypes == null && tested.isEmpty && assigned) {
+    if (promotedTypes == null && tested.isEmpty && assigned && !unassigned) {
       return this;
     }
-    return new VariableModel<Type>(null, const [], true, writeCaptured);
+    return new VariableModel<Type>(null, const [], true, false, writeCaptured);
+  }
+
+  /// Returns a new [VariableModel] reflecting the fact that the variable is
+  /// not definitely unassigned.
+  VariableModel<Type> markNotUnassigned() {
+    if (!unassigned) return this;
+
+    return new VariableModel<Type>(
+        promotedTypes, tested, assigned, false, writeCaptured);
   }
 
   /// Returns an updated model reflect a control path that is known to have
@@ -1592,6 +1645,7 @@
     List<Type> thisPromotedTypes = promotedTypes;
     List<Type> otherPromotedTypes = otherModel.promotedTypes;
     bool newAssigned = assigned || otherModel.assigned;
+    bool newUnassigned = unassigned;
     bool newWriteCaptured = writeCaptured || otherModel.writeCaptured;
     List<Type> newPromotedTypes;
     if (unsafe) {
@@ -1623,7 +1677,7 @@
       }
     }
     return _identicalOrNew(this, otherModel, newPromotedTypes, tested,
-        newAssigned, newWriteCaptured);
+        newAssigned, newUnassigned, newWriteCaptured);
   }
 
   @override
@@ -1638,6 +1692,9 @@
     if (assigned) {
       parts.add('assigned: true');
     }
+    if (!unassigned) {
+      parts.add('unassigned: false');
+    }
     if (writeCaptured) {
       parts.add('writeCaptured: true');
     }
@@ -1678,13 +1735,13 @@
       newTested = tested;
     }
     return new VariableModel<Type>(
-        newPromotedTypes, newTested, true, writeCaptured);
+        newPromotedTypes, newTested, true, false, writeCaptured);
   }
 
   /// Returns a new [VariableModel] reflecting the fact that the variable has
   /// been write-captured.
   VariableModel<Type> writeCapture() {
-    return new VariableModel<Type>(null, const [], assigned, true);
+    return new VariableModel<Type>(null, const [], assigned, false, true);
   }
 
   /// Determines whether a variable with the given [promotedTypes] should be
@@ -1759,12 +1816,13 @@
     List<Type> newPromotedTypes = joinPromotedTypes(
         first.promotedTypes, second.promotedTypes, typeOperations);
     bool newAssigned = first.assigned && second.assigned;
+    bool newUnassigned = first.unassigned && second.unassigned;
     bool newWriteCaptured = first.writeCaptured || second.writeCaptured;
     List<Type> newTested = newWriteCaptured
         ? const []
         : joinTested(first.tested, second.tested, typeOperations);
     return _identicalOrNew(first, second, newPromotedTypes, newTested,
-        newAssigned, newWriteCaptured);
+        newAssigned, newUnassigned, newWriteCaptured);
   }
 
   /// Performs the portion of the "join" algorithm that applies to promotion
@@ -1865,20 +1923,23 @@
       List<Type> newPromotedTypes,
       List<Type> newTested,
       bool newAssigned,
+      bool newUnassigned,
       bool newWriteCaptured) {
     if (identical(first.promotedTypes, newPromotedTypes) &&
         identical(first.tested, newTested) &&
         first.assigned == newAssigned &&
+        first.unassigned == newUnassigned &&
         first.writeCaptured == newWriteCaptured) {
       return first;
     } else if (identical(second.promotedTypes, newPromotedTypes) &&
         identical(second.tested, newTested) &&
         second.assigned == newAssigned &&
+        second.unassigned == newUnassigned &&
         second.writeCaptured == newWriteCaptured) {
       return second;
     } else {
-      return new VariableModel<Type>(
-          newPromotedTypes, newTested, newAssigned, newWriteCaptured);
+      return new VariableModel<Type>(newPromotedTypes, newTested, newAssigned,
+          newUnassigned, newWriteCaptured);
     }
   }
 
@@ -2147,6 +2208,8 @@
 
   @override
   void for_end() {
+    FlowModel<Variable, Type> afterUpdate = _current;
+
     _WhileContext<Variable, Type> context =
         _stack.removeLast() as _WhileContext<Variable, Type>;
     // Tail of the stack: falseCondition, break
@@ -2154,6 +2217,7 @@
     FlowModel<Variable, Type> falseCondition = context._conditionInfo.ifFalse;
 
     _current = _join(falseCondition, breakState);
+    _current = _current.joinUnassigned(afterUpdate);
   }
 
   @override
@@ -2198,9 +2262,11 @@
   void functionExpression_end() {
     --_functionNestingLevel;
     assert(_functionNestingLevel >= 0);
+    FlowModel<Variable, Type> afterBody = _current;
     _SimpleContext<Variable, Type> context =
         _stack.removeLast() as _SimpleContext<Variable, Type>;
     _current = context._previous;
+    _current = _current.joinUnassigned(afterBody);
   }
 
   @override
@@ -2302,6 +2368,11 @@
   }
 
   @override
+  bool isUnassigned(Variable variable) {
+    return _current.infoFor(variable).unassigned;
+  }
+
+  @override
   void logicalBinaryOp_end(Expression wholeExpression, Expression rightOperand,
       {@required bool isAnd}) {
     _BranchContext<Variable, Type> context =
@@ -2524,7 +2595,9 @@
   void whileStatement_end() {
     _WhileContext<Variable, Type> context =
         _stack.removeLast() as _WhileContext<Variable, Type>;
+    var afterBody = _current;
     _current = _join(context._conditionInfo.ifFalse, context._breakModel);
+    _current = _current.joinUnassigned(afterBody);
   }
 
   @override
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/assert.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/assert.dart
new file mode 100644
index 0000000..4cb7a87
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/assert.dart
@@ -0,0 +1,9 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+assertStatement() {
+  late int v;
+  assert((v = 0) >= 0, v);
+  v;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/assignment.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/assignment.dart
new file mode 100644
index 0000000..a6e4856
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/assignment.dart
@@ -0,0 +1,46 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+leftExpression() {
+  late List<int> v;
+  /*unassigned*/ v[0] = (v = [1, 2])[1];
+  v;
+}
+
+leftLocal_compound() {
+  late int v;
+  /*unassigned*/ v += 1;
+}
+
+leftLocal_compound_assignInRight() {
+  late int v;
+  /*unassigned*/ v += (v = /*unassigned*/ v);
+}
+
+leftLocal_pure_eq() {
+  late int v;
+  v = 0;
+}
+
+leftLocal_pure_eq_self() {
+  late int v;
+  v = /*unassigned*/ v;
+}
+
+leftLocal_pure_questionEq() {
+  late int v;
+  /*unassigned*/ v ??= 0;
+}
+
+leftLocal_pure_questionEq_self() {
+  late int v;
+  /*unassigned*/ v ??= /*unassigned*/ v;
+}
+
+questionEq_rhs_not_guaranteed_to_execute() {
+  late int v;
+  int? i;
+  /*unassigned*/ i ??= (v = 0);
+  v;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/binary_expression.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/binary_expression.dart
new file mode 100644
index 0000000..f666e45
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/binary_expression.dart
@@ -0,0 +1,51 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+ifNull_left() {
+  late int v;
+  (v = 0) ?? 0;
+  v;
+}
+
+ifNull_right(int a) {
+  late int v;
+  a ?? (v = 0);
+  v;
+}
+
+logicalAnd_left(bool c) {
+  late int v;
+  ((v = 0) >= 0) && c;
+  v;
+}
+
+logicalAnd_right(bool c) {
+  late int v;
+  c && ((v = 0) >= 0);
+  v;
+}
+
+logicalOr_left(bool c) {
+  late int v;
+  ((v = 0) >= 0) || c;
+  v;
+}
+
+logicalOr_right(bool c) {
+  late int v;
+  c || ((v = 0) >= 0);
+  v;
+}
+
+plus_left() {
+  late int v;
+  (v = 0) + 1;
+  v;
+}
+
+plus_right() {
+  late int v;
+  1 + (v = 0);
+  v;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/conditional_expression.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/conditional_expression.dart
new file mode 100644
index 0000000..81f2fb5
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/conditional_expression.dart
@@ -0,0 +1,27 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+in_both(bool c) {
+  late int v;
+  c ? (v = 0) : (v = 0);
+  v;
+}
+
+in_condition() {
+  late int v;
+  (v = 0) >= 0 ? 1 : 2;
+  v;
+}
+
+in_else(bool c) {
+  late int v;
+  c ? (v = 0) : 2;
+  v;
+}
+
+in_then(bool c) {
+  late int v;
+  c ? (v = 0) : 2;
+  v;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/do.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/do.dart
new file mode 100644
index 0000000..b9671f8
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/do.dart
@@ -0,0 +1,93 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+break_afterAssignment(bool c) {
+  late int v;
+  do {
+    v = 0;
+    v;
+    if (c) break;
+  } while (c);
+  v;
+}
+
+break_beforeAssignment(bool c) {
+  late int v;
+  do {
+    if (c) break;
+    v = 0;
+  } while (c);
+  v;
+}
+
+breakOuterFromInner(bool c) {
+  late int v1, v2, v3;
+  L1:
+  do {
+    do {
+      v1 = 0;
+      if (c) break L1;
+      v2 = 0;
+      v3 = 0;
+    } while (c);
+    v2;
+  } while (c);
+  v1;
+  v3;
+}
+
+condition() {
+  late int v1, v2;
+  do {
+    /*unassigned*/ v1; // assigned in the condition, but not yet
+  } while ((v1 = 0) + (v2 = 0) >= 0);
+  v2;
+}
+
+condition_break(bool c) {
+  late int v;
+  do {
+    if (c) break;
+  } while ((v = 0) >= 0);
+  v;
+}
+
+condition_break_continue(bool c1, bool c2) {
+  late int v1, v2, v3, v4, v5, v6;
+  do {
+    v1 = 0;
+    if (c1) break;
+    v2 = 0;
+    v3 = 0;
+    if (c2) continue;
+    v4 = 0;
+    v5 = 0;
+  } while ((v6 = v1 + v2 + v4) == 0);
+  v1;
+  v3;
+  v5;
+  v6;
+}
+
+condition_continue(bool c) {
+  late int v1, v2, v3, v4;
+  do {
+    v1 = 0;
+    if (c) continue;
+    v2 = 0;
+    v3 = 0;
+  } while ((v4 = v1 + v2) == 0);
+  v1;
+  v3;
+  v4;
+}
+
+continue_beforeAssignment(bool c) {
+  late int v;
+  do {
+    if (c) continue;
+    v = 0;
+  } while (c);
+  v;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/for.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/for.dart
new file mode 100644
index 0000000..dc59c89
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/for.dart
@@ -0,0 +1,125 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+for_body(bool c) {
+  late int v;
+  for (; c;) {
+    v = 0;
+  }
+  v;
+}
+
+for_break(bool c) {
+  late int v1, v2;
+  for (; c;) {
+    v1 = 0;
+    if (c) break;
+    v2 = 0;
+  }
+  v1;
+  v2;
+}
+
+for_break_updaters(bool c) {
+  late int v1, v2;
+  for (; c; v1 + v2) {
+    v1 = 0;
+    if (c) break;
+    v2 = 0;
+  }
+}
+
+for_condition() {
+  late int v;
+  for (; (v = 0) >= 0;) {
+    v;
+  }
+  v;
+}
+
+for_continue(bool c) {
+  late int v1, v2;
+  for (; c;) {
+    v1 = 0;
+    if (c) continue;
+    v2 = 0;
+  }
+  v1;
+  v2;
+}
+
+for_continue_updaters(bool c) {
+  late int v1, v2;
+  for (; c; v1 + v2) {
+    v1 = 0;
+    if (c) continue;
+    v2 = 0;
+  }
+}
+
+for_initializer_expression() {
+  late int v;
+  for (v = 0;;) {
+    v;
+  }
+  v;
+}
+
+for_initializer_variable() {
+  late int v;
+  for (var t = (v = 0);;) {
+    v;
+  }
+  v;
+}
+
+for_updaters(bool c) {
+  late int v1, v2, v3, v4;
+  for (; c; v1 = 0, v2 = 0, v3 = 0, /*unassigned*/ v4) {
+    /*unassigned*/ v1;
+  }
+  v2;
+}
+
+for_updaters_afterBody(bool c) {
+  late int v;
+  for (; c; v) {
+    v = 0;
+  }
+}
+
+collection_for_body(bool c) {
+  late int v;
+  [for (; c;) (v = 0)];
+  v;
+}
+
+collection_for_condition() {
+  late int v;
+  [for (; (v = 0) >= 0;) null];
+  v;
+}
+
+collection_for_initializer_expression() {
+  late int v;
+  [for (v = 0;;) v];
+  v;
+}
+
+collection_for_initializer_variable() {
+  late int v;
+  [for (var t = (v = 0);;) v];
+  v;
+}
+
+collection_for_updaters(bool c) {
+  late int v1, v2, v3, v4;
+  [for (; c; v1 = 0, v2 = 0, v3 = 0, /*unassigned*/ v4) /*unassigned*/ v1 ];
+  v2;
+}
+
+collection_for_updaters_afterBody(bool c) {
+  late int v;
+  [for (; c; v) (v = 0)];
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/for_each.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/for_each.dart
new file mode 100644
index 0000000..0ebc102
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/for_each.dart
@@ -0,0 +1,71 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+forEach() {
+  late Object v1, v2;
+  for (var _ in (v1 = [0, 1, 2])) {
+    v2 = 0;
+  }
+  v1;
+  v2;
+}
+
+forEach_break(bool c) {
+  late int v1, v2;
+  for (var _ in [0, 1, 2]) {
+    v1 = 0;
+    if (c) break;
+    v2 = 0;
+  }
+  v1;
+  v2;
+}
+
+forEach_continue(bool c) {
+  late int v1, v2;
+  for (var _ in [0, 1, 2]) {
+    v1 = 0;
+    if (c) continue;
+    v2 = 0;
+  }
+  v1;
+  v2;
+}
+
+forEach_assigns_to_identifier() {
+  late int i;
+  for (i in [0, 1, 2]) {
+    i;
+  }
+  i;
+}
+
+forEach_assigns_to_declared_var() {
+  for (int i in [0, 1, 2]) {
+    i;
+  }
+}
+
+collection_forEach() {
+  late Object v1, v2;
+  [
+    for (var _ in (v1 = [0, 1, 2])) (v2 = 0)
+  ];
+  v1;
+  v2;
+}
+
+collection_forEach_assigns_to_identifier() {
+  late int i;
+  [
+    for (i in [0, 1, 2]) i
+  ];
+  i;
+}
+
+collection_forEach_assigns_to_declared_var() {
+  [
+    for (int i in [0, 1, 2]) i
+  ];
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/function_expression.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/function_expression.dart
new file mode 100644
index 0000000..d614577
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/function_expression.dart
@@ -0,0 +1,97 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+closure_read() {
+  late int v1, v2;
+
+  v1 = 0;
+
+  [0, 1, 2].forEach((t) {
+    v1;
+    /*unassigned*/ v2;
+  });
+}
+
+closure_write() {
+  late int v;
+
+  /*unassigned*/ v;
+
+  [0, 1, 2].forEach((t) {
+    v = t;
+  });
+
+  v;
+}
+
+localFunction_local() {
+  late int v;
+
+  v = 0;
+
+  void f() {
+    late int v;
+    /*unassigned*/ v;
+  }
+}
+
+localFunction_local2() {
+  late int v1;
+
+  v1 = 0;
+
+  void f() {
+    late int v2, v3;
+    v2 = 0;
+    v1;
+    v2;
+    /*unassigned*/ v3;
+  }
+}
+
+localFunction_read() {
+  late int v1, v2, v3;
+
+  v1 = 0;
+
+  void f() {
+    v1;
+    /*unassigned*/ v2;
+  }
+
+  v2 = 0;
+}
+
+localFunction_write() {
+  late int v;
+
+  /*unassigned*/ v;
+
+  void f() {
+    v = 0;
+  }
+
+  v;
+}
+
+writeCaptured() {
+  late int v1, v2;
+
+  void f() {
+    v1;
+    /*unassigned*/ v2;
+  }
+
+  void g() {
+    v1 = 0;
+    v1;
+    /*unassigned*/ v2;
+  }
+
+  g();
+  f();
+
+  v1;
+  /*unassigned*/ v2;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/if.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/if.dart
new file mode 100644
index 0000000..46ffbe9
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/if.dart
@@ -0,0 +1,94 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+if_condition() {
+  late int v;
+  if ((v = 0) >= 0) {
+    v;
+  } else {
+    v;
+  }
+  v;
+}
+
+if_then(bool c) {
+  late int v;
+  if (c) {
+    v = 0;
+  }
+  v;
+}
+
+if_thenElse_none(bool c) {
+  late int v;
+  if (c) {
+  } else {}
+  /*unassigned*/ v;
+}
+
+if_thenElse_else(bool c) {
+  late int v;
+  if (c) {
+    // not assigned
+  } else {
+    v = 0;
+  }
+  v;
+}
+
+if_thenElse_then(bool c) {
+  late int v;
+  if (c) {
+    v = 0;
+  } else {
+    // not assigned
+  }
+  v;
+}
+
+if_thenElse_all(bool c) {
+  late int v;
+  if (c) {
+    v = 0;
+    v;
+  } else {
+    v = 0;
+    v;
+  }
+  v;
+}
+
+if_thenElse_then_exit_alwaysThrows(bool c) {
+  late int v;
+  if (c) {
+    v = 0;
+  } else {
+    foo();
+  }
+  v;
+}
+
+Never foo() {
+  throw Object();
+}
+
+if_thenElse_then_exit_return(bool c) {
+  late int v;
+  if (c) {
+    v = 0;
+  } else {
+    return;
+  }
+  v;
+}
+
+if_thenElse_then_exit_throw(bool c) {
+  late int v;
+  if (c) {
+    v = 0;
+  } else {
+    throw 42;
+  }
+  v;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/initialization.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/initialization.dart
new file mode 100644
index 0000000..fd8b66f
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/initialization.dart
@@ -0,0 +1,33 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// The tests in this file exercise various kinds of constructs that initialize a
+// variable at its declaration site.  We verify that the variable is not
+// considered definitely unassigned by the initialization.
+
+parameter(int a) {
+  a;
+}
+
+localParameter() {
+  localFunction(int a) {
+    a;
+  }
+
+  (int b) {
+    b;
+  };
+}
+
+localVariable() {
+  Object a = 1;
+  a;
+}
+
+catchParameters() {
+  try {} on Object catch (e, st) {
+    e;
+    st;
+  }
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/marker.options b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/marker.options
new file mode 100644
index 0000000..a062e57
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/marker.options
@@ -0,0 +1,2 @@
+cfe=pkg/front_end/test/id_tests/definite_unassignment_test.dart
+analyzer=pkg/analyzer/test/id_tests/definite_unassignment_test.dart
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/switch.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/switch.dart
new file mode 100644
index 0000000..4726804
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/switch.dart
@@ -0,0 +1,88 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+case1_default(int e) {
+  late int v;
+  switch (e) {
+    case 1:
+      v = 0;
+      break;
+    case 2:
+      // not assigned
+      break;
+    default:
+      v = 0;
+  }
+  v;
+}
+
+case2_default(int e) {
+  late int v1, v2, v3;
+  switch (e) {
+    case 1:
+      v1 = 0;
+      v2 = 0;
+      v1;
+      break;
+    default:
+      v1 = 0;
+      v1;
+  }
+  v1;
+  v2;
+  /*unassigned*/ v3;
+}
+
+case_default_break(int e, bool c) {
+  late int v1, v2, v3;
+  switch (e) {
+    case 1:
+      v1 = 0;
+      if (c) break;
+      v2 = 0;
+      break;
+    default:
+      v1 = 0;
+      if (c) break;
+      v2 = 0;
+  }
+  v1;
+  v2;
+  /*unassigned*/ v3;
+}
+
+case_default_continue(int e) {
+  late int v1, v2;
+  switch (e) {
+    L:
+    case 1:
+      v1 = 0;
+      break;
+    case 2:
+      continue L;
+    default:
+      v1 = 0;
+  }
+  v1;
+  /*unassigned*/ v2;
+}
+
+case_noDefault(int e) {
+  late int v1, v2;
+  switch (e) {
+    case 1:
+      v1 = 0;
+      break;
+  }
+  v1;
+  /*unassigned*/ v2;
+}
+
+condition() {
+  late int v1, v2;
+  switch (v1 = 0) {
+  }
+  v1;
+  /*unassigned*/ v2;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/try.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/try.dart
new file mode 100644
index 0000000..40e2c9d
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/try.dart
@@ -0,0 +1,92 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+void f() {}
+
+tryCatch_all() {
+  late int v;
+  try {
+    f();
+    v = 0;
+  } catch (_) {
+    v = 0;
+  }
+  v;
+}
+
+tryCatch_catch() {
+  late int v;
+  try {
+    // not assigned
+  } catch (_) {
+    v = 0;
+  }
+  v;
+}
+
+tryCatch_try() {
+  late int v;
+  try {
+    v = 0;
+  } catch (_) {
+    // not assigned
+  }
+  v;
+}
+
+tryCatchFinally_catch() {
+  late int v;
+  try {
+    // not assigned
+  } catch (_) {
+    v = 0;
+  } finally {
+    // not assigned
+  }
+  v;
+}
+
+tryCatchFinally_finally() {
+  late int v;
+  try {
+    // not assigned
+  } catch (_) {
+    // not assigned
+  } finally {
+    v = 1;
+  }
+  v;
+}
+
+tryCatchFinally_try() {
+  late int v;
+  try {
+    v = 0;
+  } catch (_) {
+    // not assigned
+  } finally {
+    // not assigned
+  }
+  v;
+}
+
+tryFinally_finally() {
+  late int v;
+  try {
+    // not assigned
+  } finally {
+    v = 0;
+  }
+  v;
+}
+
+tryFinally_try() {
+  late int v;
+  try {
+    v = 0;
+  } finally {
+    // not assigned
+  }
+  v;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/while.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/while.dart
new file mode 100644
index 0000000..f5a898c
--- /dev/null
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/definite_unassignment/data/while.dart
@@ -0,0 +1,132 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+condition() {
+  late int v;
+  while ((v = 0) >= 0) {
+    v;
+  }
+  v;
+}
+
+condition_notTrue(bool c) {
+  late int v1, v2;
+  while (c) {
+    v1 = 0;
+    v2 = 0;
+    v1;
+  }
+  v1;
+  v2;
+}
+
+true_break_afterAssignment(bool c) {
+  late int v1, v2;
+  while (true) {
+    v1 = 0;
+    v1;
+    if (c) break;
+    v1;
+    v2 = 0;
+    v2;
+  }
+  v1;
+  v2;
+}
+
+true_break_beforeAssignment(bool c) {
+  late int v1, v2;
+  while (true) {
+    if (c) break;
+    v1 = 0;
+    v2 = 0;
+    v2;
+  }
+  v1;
+  v2;
+}
+
+true_break_if(bool c) {
+  late int v;
+  while (true) {
+    if (c) {
+      v = 0;
+      break;
+    } else {
+      v = 0;
+      break;
+    }
+    v;
+  }
+  v;
+}
+
+true_break_if2(bool c) {
+  late Object v;
+  while (true) {
+    if (c) {
+      break;
+    } else {
+      v = 0;
+    }
+    v;
+  }
+}
+
+true_break_if3(bool c) {
+  late int v1, v2, v3;
+  while (true) {
+    if (c) {
+      v1 = 0;
+      v2 = 0;
+      if (c) break;
+    } else {
+      if (c) break;
+      v1 = 0;
+      v2 = 0;
+    }
+    v1;
+  }
+  v1;
+  v2;
+  /*unassigned*/ v3;
+}
+
+true_breakOuterFromInner(bool c) {
+  late int v1, v2, v3, v4;
+  L1:
+  while (true) {
+    L2:
+    while (true) {
+      v1 = 0;
+      if (c) break L1;
+      v2 = 0;
+      v3 = 0;
+      if (c) break L2;
+    }
+    v2;
+  }
+  v1;
+  v2;
+  v3;
+  /*unassigned*/ v4;
+}
+
+true_continue(bool c) {
+  late int v;
+  while (true) {
+    if (c) continue;
+    v = 0;
+  }
+  v;
+}
+
+true_noBreak(bool c) {
+  late int v;
+  while (true) {
+    // No assignment, but not break.
+    // So, we don't exit the loop.
+  }
+  /*unassigned*/ v;
+}
diff --git a/pkg/_fe_analyzer_shared/test/flow_analysis/flow_analysis_test.dart b/pkg/_fe_analyzer_shared/test/flow_analysis/flow_analysis_test.dart
index b66c3d4..93374c3 100644
--- a/pkg/_fe_analyzer_shared/test/flow_analysis/flow_analysis_test.dart
+++ b/pkg/_fe_analyzer_shared/test/flow_analysis/flow_analysis_test.dart
@@ -1814,7 +1814,10 @@
         expect(
             s2.infoFor(objectQVar),
             _matchVariableModel(
-                chain: null, ofInterest: isEmpty, assigned: true));
+                chain: null,
+                ofInterest: isEmpty,
+                assigned: true,
+                unassigned: false));
       });
 
       test('un-promotes fully', () {
@@ -1829,7 +1832,10 @@
         expect(s2.reachable, true);
         expect(s2.variableInfo, {
           objectQVar: _matchVariableModel(
-              chain: null, ofInterest: isEmpty, assigned: true)
+              chain: null,
+              ofInterest: isEmpty,
+              assigned: true,
+              unassigned: false)
         });
       });
 
@@ -1846,13 +1852,17 @@
           objectQVar: _matchVariableModel(
               chain: ['num?', 'int'],
               ofInterest: ['num?', 'int'],
-              assigned: true)
+              assigned: true,
+              unassigned: false)
         });
         var s2 = s1.write(objectQVar, _Type('num'), h);
         expect(s2.reachable, true);
         expect(s2.variableInfo, {
           objectQVar: _matchVariableModel(
-              chain: ['num?'], ofInterest: ['num?', 'int'], assigned: true)
+              chain: ['num?'],
+              ofInterest: ['num?', 'int'],
+              assigned: true,
+              unassigned: false)
         });
       });
 
@@ -1871,7 +1881,8 @@
           objectQVar: _matchVariableModel(
               chain: ['num?', 'num', 'int'],
               ofInterest: ['num?', 'num', 'int'],
-              assigned: true)
+              assigned: true,
+              unassigned: false)
         });
         var s2 = s1.write(objectQVar, _Type('num'), h);
         expect(s2.reachable, true);
@@ -1879,7 +1890,8 @@
           objectQVar: _matchVariableModel(
               chain: ['num?', 'num'],
               ofInterest: ['num?', 'num', 'int'],
-              assigned: true)
+              assigned: true,
+              unassigned: false)
         });
       });
 
@@ -1896,7 +1908,8 @@
           objectQVar: _matchVariableModel(
               chain: ['num?', 'num'],
               ofInterest: ['num?', 'num'],
-              assigned: true)
+              assigned: true,
+              unassigned: false)
         });
         var s2 = s1.write(objectQVar, _Type('num'), h);
         expect(s2.reachable, true);
@@ -1916,7 +1929,8 @@
           objectQVar: _matchVariableModel(
               chain: ['num?', 'num'],
               ofInterest: ['num?', 'num'],
-              assigned: true)
+              assigned: true,
+              unassigned: false)
         });
         var s2 = s1.write(objectQVar, _Type('int'), h);
         expect(s2.reachable, true);
@@ -2051,14 +2065,14 @@
       test('initialized', () {
         var s = FlowModel<_Var, _Type>(true).declare(objectQVar, true);
         expect(s.variableInfo, {
-          objectQVar: _matchVariableModel(assigned: true),
+          objectQVar: _matchVariableModel(assigned: true, unassigned: false),
         });
       });
 
       test('not initialized', () {
         var s = FlowModel<_Var, _Type>(true).declare(objectQVar, false);
         expect(s.variableInfo, {
-          objectQVar: _matchVariableModel(assigned: false),
+          objectQVar: _matchVariableModel(assigned: false, unassigned: true),
         });
       });
     });
@@ -2103,6 +2117,81 @@
       });
     });
 
+    group('joinUnassigned', () {
+      test('unchanged', () {
+        var h = _Harness();
+
+        var a = _Var('a', _Type('int'));
+        var b = _Var('b', _Type('int'));
+
+        var s1 = FlowModel<_Var, _Type>(true)
+            .declare(a, false)
+            .declare(b, false)
+            .write(a, _Type('int'), h);
+        expect(s1.variableInfo, {
+          a: _matchVariableModel(assigned: true, unassigned: false),
+          b: _matchVariableModel(assigned: false, unassigned: true),
+        });
+
+        var s2 = s1.write(a, _Type('int'), h);
+        expect(s2.variableInfo, {
+          a: _matchVariableModel(assigned: true, unassigned: false),
+          b: _matchVariableModel(assigned: false, unassigned: true),
+        });
+
+        var s3 = s1.joinUnassigned(s2);
+        expect(s3, same(s1));
+      });
+
+      test('written', () {
+        var h = _Harness();
+
+        var a = _Var('a', _Type('int'));
+        var b = _Var('b', _Type('int'));
+        var c = _Var('c', _Type('int'));
+
+        var s1 = FlowModel<_Var, _Type>(true)
+            .declare(a, false)
+            .declare(b, false)
+            .declare(c, false)
+            .write(a, _Type('int'), h);
+        expect(s1.variableInfo, {
+          a: _matchVariableModel(assigned: true, unassigned: false),
+          b: _matchVariableModel(assigned: false, unassigned: true),
+          c: _matchVariableModel(assigned: false, unassigned: true),
+        });
+
+        var s2 = s1.write(b, _Type('int'), h);
+        expect(s2.variableInfo, {
+          a: _matchVariableModel(assigned: true, unassigned: false),
+          b: _matchVariableModel(assigned: true, unassigned: false),
+          c: _matchVariableModel(assigned: false, unassigned: true),
+        });
+
+        var s3 = s1.joinUnassigned(s2);
+        expect(s3.variableInfo, {
+          a: _matchVariableModel(assigned: true, unassigned: false),
+          b: _matchVariableModel(assigned: false, unassigned: false),
+          c: _matchVariableModel(assigned: false, unassigned: true),
+        });
+      });
+
+      test('write captured', () {
+        var h = _Harness();
+        var s1 = FlowModel<_Var, _Type>(true)
+            .tryPromote(h, objectQVar, _Type('int'))
+            .ifTrue
+            .tryPromote(h, intQVar, _Type('int'))
+            .ifTrue;
+        var s2 = s1.removePromotedAll([], [intQVar]);
+        expect(s2.reachable, true);
+        expect(s2.variableInfo, {
+          objectQVar: _matchVariableModel(chain: ['int'], ofInterest: ['int']),
+          intQVar: _matchVariableModel(chain: null, ofInterest: isEmpty)
+        });
+      });
+    });
+
     group('removePromotedAll', () {
       test('unchanged', () {
         var h = _Harness();
@@ -2139,7 +2228,8 @@
         expect(s2.reachable, true);
         expect(s2.variableInfo, {
           objectQVar: _matchVariableModel(chain: ['int'], ofInterest: ['int']),
-          intQVar: _matchVariableModel(chain: null, ofInterest: isEmpty)
+          intQVar: _matchVariableModel(
+              chain: null, ofInterest: isEmpty, unassigned: false)
         });
       });
     });
@@ -2167,8 +2257,8 @@
             .declare(c, false)
             .declare(d, false);
         var s1 = s0.write(a, _Type('int'), h).write(b, _Type('int'), h);
-        var s2 = s0.write(a, _Type('int'), h).write(c, _Type('int'), h);
-        var result = s1.restrict(h, s2, Set());
+        var s2 = s1.write(a, _Type('int'), h).write(c, _Type('int'), h);
+        var result = s2.restrict(h, s1, Set());
         expect(result.infoFor(a).assigned, true);
         expect(result.infoFor(b).assigned, true);
         expect(result.infoFor(c).assigned, true);
@@ -2188,12 +2278,24 @@
             .declare(d, false);
         // In s1, a and b are write captured.  In s2, a and c are.
         var s1 = s0.removePromotedAll([a, b], [a, b]);
-        var s2 = s0.removePromotedAll([a, c], [a, c]);
-        var result = s1.restrict(h, s2, Set());
-        expect(result.infoFor(a).writeCaptured, true);
-        expect(result.infoFor(b).writeCaptured, true);
-        expect(result.infoFor(c).writeCaptured, true);
-        expect(result.infoFor(d).writeCaptured, false);
+        var s2 = s1.removePromotedAll([a, c], [a, c]);
+        var result = s2.restrict(h, s1, Set());
+        expect(
+          result.infoFor(a),
+          _matchVariableModel(writeCaptured: true, unassigned: false),
+        );
+        expect(
+          result.infoFor(b),
+          _matchVariableModel(writeCaptured: true, unassigned: false),
+        );
+        expect(
+          result.infoFor(c),
+          _matchVariableModel(writeCaptured: true, unassigned: false),
+        );
+        expect(
+          result.infoFor(d),
+          _matchVariableModel(writeCaptured: false, unassigned: true),
+        );
       });
 
       test('promotion', () {
@@ -2491,7 +2593,7 @@
     VariableModel<_Type> model(List<_Type> promotionChain,
             [List<_Type> typesOfInterest]) =>
         VariableModel<_Type>(promotionChain,
-            typesOfInterest ?? promotionChain ?? [], false, false);
+            typesOfInterest ?? promotionChain ?? [], false, true, false);
 
     group('without input reuse', () {
       test('promoted with unpromoted', () {
@@ -2627,8 +2729,10 @@
         var joined = FlowModel.joinVariableInfo(h, p1, p2);
         expect(joined, {
           x: same(writtenModel),
-          y: _matchVariableModel(chain: null, assigned: false),
-          z: _matchVariableModel(chain: null, assigned: false),
+          y: _matchVariableModel(
+              chain: null, assigned: false, unassigned: false),
+          z: _matchVariableModel(
+              chain: null, assigned: false, unassigned: false),
           w: same(intQModel)
         });
       });
@@ -2698,6 +2802,7 @@
     {Object chain = anything,
     Object ofInterest = anything,
     Object assigned = anything,
+    Object unassigned = anything,
     Object writeCaptured = anything}) {
   Matcher chainMatcher =
       chain is List<String> ? _matchPromotionChain(chain) : wrapMatcher(chain);
@@ -2705,18 +2810,21 @@
       ? _matchOfInterestSet(ofInterest)
       : wrapMatcher(ofInterest);
   Matcher assignedMatcher = wrapMatcher(assigned);
+  Matcher unassignedMatcher = wrapMatcher(unassigned);
   Matcher writeCapturedMatcher = wrapMatcher(writeCaptured);
   return predicate((VariableModel<_Type> model) {
     if (!chainMatcher.matches(model.promotedTypes, {})) return false;
     if (!ofInterestMatcher.matches(model.tested, {})) return false;
     if (!assignedMatcher.matches(model.assigned, {})) return false;
+    if (!unassignedMatcher.matches(model.unassigned, {})) return false;
     if (!writeCapturedMatcher.matches(model.writeCaptured, {})) return false;
     return true;
   },
       'VariableModel(chain: ${_describeMatcher(chainMatcher)}, '
       'ofInterest: ${_describeMatcher(ofInterestMatcher)}, '
-      'assigned: ${_describeMatcher(assignedMatcher)}, writeCaptured: '
-      '${_describeMatcher(writeCapturedMatcher)})');
+      'assigned: ${_describeMatcher(assignedMatcher)}, '
+      'unassigned: ${_describeMatcher(unassignedMatcher)}, '
+      'writeCaptured: ${_describeMatcher(writeCapturedMatcher)})');
 }
 
 /// Representation of an expression to be visited by the test harness.  Calling
diff --git a/pkg/analysis_server/lib/src/edit/edit_dartfix.dart b/pkg/analysis_server/lib/src/edit/edit_dartfix.dart
index 168a7a4..163288d 100644
--- a/pkg/analysis_server/lib/src/edit/edit_dartfix.dart
+++ b/pkg/analysis_server/lib/src/edit/edit_dartfix.dart
@@ -15,6 +15,7 @@
 import 'package:analyzer/dart/analysis/session.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/engine.dart' show AnalysisOptionsImpl;
+import 'package:analyzer/src/generated/source.dart' show SourceKind;
 
 class EditDartFix
     with FixCodeProcessor, FixErrorProcessor, FixLintProcessor
@@ -34,7 +35,6 @@
 
   Future<Response> compute() async {
     final params = EditDartfixParams.fromRequest(request);
-
     // Determine the fixes to be applied
     final fixInfo = <DartFixInfo>[];
     if (params.includePedanticFixes == true) {
@@ -208,6 +208,8 @@
     for (String rootPath in contextManager.includedPaths) {
       resources.add(resourceProvider.getResource(rootPath));
     }
+
+    var pathsToProcess = <String>{};
     while (resources.isNotEmpty) {
       Resource res = resources.removeLast();
       if (res is Folder) {
@@ -223,7 +225,38 @@
       if (!isIncluded(res.path)) {
         continue;
       }
-      ResolvedUnitResult result = await server.getResolvedUnit(res.path);
+      pathsToProcess.add(res.path);
+    }
+
+    var pathsProcessed = <String>{};
+    for (String path in pathsToProcess) {
+      if (pathsProcessed.contains(path)) continue;
+      var driver = server.getAnalysisDriver(path);
+      switch (await driver.getSourceKind(path)) {
+        case SourceKind.PART:
+          // Parts will either be found in a library, below, or if the library
+          // isn't [isIncluded], will be picked up in the final loop.
+          continue;
+          break;
+        case SourceKind.LIBRARY:
+          ResolvedLibraryResult result = await driver.getResolvedLibrary(path);
+          if (result != null) {
+            for (var unit in result.units) {
+              if (pathsToProcess.contains(unit.path) &&
+                  !pathsProcessed.contains(unit.path)) {
+                await process(unit);
+                pathsProcessed.add(unit.path);
+              }
+            }
+          }
+          break;
+        default:
+          break;
+      }
+    }
+
+    for (String path in pathsToProcess.difference(pathsProcessed)) {
+      ResolvedUnitResult result = await server.getResolvedUnit(path);
       if (result == null || result.unit == null) {
         continue;
       }
diff --git a/pkg/analysis_server/lib/src/edit/nnbd_migration/resources/migration.css b/pkg/analysis_server/lib/src/edit/nnbd_migration/resources/migration.css
index f31c153..fa34d2e 100644
--- a/pkg/analysis_server/lib/src/edit/nnbd_migration/resources/migration.css
+++ b/pkg/analysis_server/lib/src/edit/nnbd_migration/resources/migration.css
@@ -356,6 +356,31 @@
   cursor: pointer;
 }
 
+p.trace .type-description {
+  /* From HLJS's .hljs-keyword, .hljs-selector-tag, .hljs-deletion */
+  color: #cc7832;
+  font-family: monospace;
+}
+
+ul.trace {
+  font-size: 13px;
+  list-style-type: none;
+  padding-left: 0px;
+}
+
+ul.trace li {
+  color: white;
+  margin-left: 14px;
+  text-indent: -14px;
+}
+
+ul.trace li .function {
+  /* From HLJS's .hljs-section, .hljs-title, .hljs-type */
+  color: #ffc66d;
+  font-family: monospace;
+  font-weight: 600;
+}
+
 .elevation-z4 {
   box-shadow: 0px 2px 4px -1px rgba(0, 0, 0, 0.2),
       0px 4px 5px 0px rgba(0, 0, 0, 0.14),
diff --git a/pkg/analysis_server/lib/src/edit/nnbd_migration/resources/resources.g.dart b/pkg/analysis_server/lib/src/edit/nnbd_migration/resources/resources.g.dart
index 9f81bbc..6c54a4b 100644
--- a/pkg/analysis_server/lib/src/edit/nnbd_migration/resources/resources.g.dart
+++ b/pkg/analysis_server/lib/src/edit/nnbd_migration/resources/resources.g.dart
@@ -315,7 +315,7 @@
 ''';
 
 String _migration_css;
-// migration_css md5 is '72c8740ee7c14a4d5de701dad4ed2f13'
+// migration_css md5 is 'da758dd7ff2eb51b7bf862613b1029a7'
 String _migration_css_base64 = '''
 LyogQ29weXJpZ2h0IChjKSAyMDE5LCB0aGUgRGFydCBwcm9qZWN0IGF1dGhvcnMuIFBsZWFzZSBzZWUg
 dGhlIEFVVEhPUlMgZmlsZSAgKi8KLyogZm9yIGRldGFpbHMuIEFsbCByaWdodHMgcmVzZXJ2ZWQuIFVz
@@ -405,25 +405,32 @@
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 ''';
 
 String _migration_js;
-// migration_dart md5 is 'fc62e2786d8e19ca0ecf5d3110278b11'
+// migration_dart md5 is '796c253ccc9415268d590a41365d5951'
 String _migration_js_base64 = '''
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@@ -522,3349 +529,3346 @@
 ZiB0IT0ic3RyaW5nIil0aHJvdyBILmIoSC50TChhKSkKcmV0dXJuIHR9LAplUTpmdW5jdGlvbihhKXt2
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+dW5kZWZpbmVkJyl7YShkb2N1bWVudC5jdXJyZW50U2NyaXB0KQpyZXR1cm59dmFyIHQ9ZG9jdW1lbnQu
+c2NyaXB0cwpmdW5jdGlvbiBvbkxvYWQoYil7Zm9yKHZhciByPTA7cjx0Lmxlbmd0aDsrK3IpdFtyXS5y
+ZW1vdmVFdmVudExpc3RlbmVyKCJsb2FkIixvbkxvYWQsZmFsc2UpCmEoYi50YXJnZXQpfWZvcih2YXIg
+cz0wO3M8dC5sZW5ndGg7KytzKXRbc10uYWRkRXZlbnRMaXN0ZW5lcigibG9hZCIsb25Mb2FkLGZhbHNl
+KX0pKGZ1bmN0aW9uKGEpe3YuY3VycmVudFNjcmlwdD1hCmlmKHR5cGVvZiBkYXJ0TWFpblJ1bm5lcj09
+PSJmdW5jdGlvbiIpZGFydE1haW5SdW5uZXIoTC5JcSxbXSkKZWxzZSBMLklxKFtdKX0pfSkoKQovLyMg
+c291cmNlTWFwcGluZ1VSTD1taWdyYXRpb24uanMubWFwCg==
 ''';
diff --git a/pkg/analysis_server/lib/src/edit/nnbd_migration/web/migration.dart b/pkg/analysis_server/lib/src/edit/nnbd_migration/web/migration.dart
index 36caedb..73e4329 100644
--- a/pkg/analysis_server/lib/src/edit/nnbd_migration/web/migration.dart
+++ b/pkg/analysis_server/lib/src/edit/nnbd_migration/web/migration.dart
@@ -407,12 +407,19 @@
   }
 
   for (var trace in response.traces) {
-    var traceParagraph = editPanel.append(document.createElement('p'));
-    traceParagraph.append(Text(trace.description));
-    var ul = traceParagraph.append(document.createElement('ul'));
+    var traceParagraph =
+        editPanel.append(document.createElement('p')..classes = ['trace']);
+    traceParagraph.append(Text('Nullability trace for: '));
+    traceParagraph.append(document.createElement('span')
+      ..classes = ['type-description']
+      ..append(Text(trace.description)));
+    var ul = traceParagraph
+        .append(document.createElement('ul')..classes = ['trace']);
     for (var entry in trace.entries) {
-      var li = ul.append(document.createElement('li'));
-      li.append(Text(entry.function ?? 'unknown'));
+      var li = ul.append(document.createElement('li')..innerHtml = '&#x274F; ');
+      li.append(document.createElement('span')
+        ..classes = ['function']
+        ..append(Text(entry.function ?? 'unknown')));
       var link = entry.link;
       if (link != null) {
         li.append(Text(' ('));
diff --git a/pkg/analysis_server/tool/completion_metrics/feature_computer.dart b/pkg/analysis_server/lib/src/services/completion/dart/feature_computer.dart
similarity index 83%
rename from pkg/analysis_server/tool/completion_metrics/feature_computer.dart
rename to pkg/analysis_server/lib/src/services/completion/dart/feature_computer.dart
index bce7cf1..9613ccd 100644
--- a/pkg/analysis_server/tool/completion_metrics/feature_computer.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/feature_computer.dart
@@ -10,18 +10,50 @@
     show ClassElement, FieldElement;
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/dart/element/type_provider.dart';
+import 'package:analyzer/dart/element/type_system.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 
-// TODO(brianwilkerson) Move this file to `lib` so that it can be used by the
-//  completion contributors.
+/// Convert a relevance score (assumed to be between `0.0` and `1.0` inclusive)
+/// to a relevance value between `0` and `1000`.
+int toRelevance(double score) {
+  if (score < 0.0) {
+    return 0;
+  }
+  return (score * 1000).truncate();
+}
+
+/// Return the weighted average of the given [values], applying the given
+/// [weights]. The number of weights must be equal to the number of values.
+/// Values less than `0.0` are ignored. If there are no non-negative values then
+/// a negative value will be returned.
+double weightedAverage(List<double> values, List<double> weights) {
+  assert(values.length == weights.length);
+  var totalValue = 0.0;
+  var totalWeight = 0.0;
+  for (int i = 0; i < values.length; i++) {
+    var value = values[i];
+    if (value >= 0.0) {
+      var weight = weights[i];
+      totalValue += value * weight;
+      totalWeight += weight;
+    }
+  }
+  if (totalWeight == 0.0) {
+    return -1.0;
+  }
+  return totalValue / totalWeight;
+}
 
 /// An object that computes the values of features.
 class FeatureComputer {
+  /// The type system used to perform operations on types.
+  final TypeSystem typeSystem;
+
   /// The type provider used to access types defined by the spec.
   final TypeProvider typeProvider;
 
   /// Initialize a newly created feature computer.
-  FeatureComputer(this.typeProvider);
+  FeatureComputer(this.typeSystem, this.typeProvider);
 
   /// Return the type imposed on the given [node] based on its context, or
   /// `null` if the context does not impose any type.
@@ -35,6 +67,32 @@
     return type;
   }
 
+  /// Return the value of the _context type_ feature for an element with the
+  /// given [elementType] when completing in a location with the given
+  /// [contextType].
+  double contextTypeFeature(AstNode node, DartType elementType) {
+    if (elementType == null) {
+      return -1.0;
+    }
+    var contextType = computeContextType(node);
+    if (contextType == null) {
+      return -1.0;
+    }
+    if (elementType == contextType) {
+      // Exact match.
+      return 1.0;
+    } else if (typeSystem.isSubtypeOf(elementType, contextType)) {
+      // Subtype.
+      return 0.40;
+    } else if (typeSystem.isSubtypeOf(contextType, elementType)) {
+      // Supertype.
+      return 0.02;
+    } else {
+      // Unrelated.
+      return 0.13;
+    }
+  }
+
   /// Return the inheritance distance between the [subclass] and the
   /// [superclass]. We define the inheritance distance between two types to be
   /// zero if the two types are the same and the minimum number of edges that
@@ -47,18 +105,22 @@
     return _inheritanceDistance(subclass, superclass, {});
   }
 
-  /// Return the value of the inheritance distance feature for a member defined
-  /// in the [superclass] that is being accessed through an expression whose
-  /// static type is the [subclass].
+  /// Return the value of the _inheritance distance_ feature for a member
+  /// defined in the [superclass] that is being accessed through an expression
+  /// whose static type is the [subclass].
   double inheritanceDistanceFeature(
       ClassElement subclass, ClassElement superclass) {
     var distance = _inheritanceDistance(subclass, superclass, {});
     if (distance < 0) {
-      return 0;
+      return 0.0;
     }
-    return 1 / (distance + 1);
+    return 1.0 / (distance + 1);
   }
 
+  /// Return the value of the _starts with dollar_ feature.
+  double startsWithDollarFeature(String name) =>
+      name.startsWith('\$') ? 0.0 : 1.0;
+
   /// Return the inheritance distance between the [subclass] and the
   /// [superclass]. The set of [visited] elements is used to guard against
   /// cycles in the type graph.
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/suggestion_builder.dart b/pkg/analysis_server/lib/src/services/completion/dart/suggestion_builder.dart
index 00d308a..d551db7 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/suggestion_builder.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/suggestion_builder.dart
@@ -281,7 +281,7 @@
   /// Add a suggestion based upon the given element, provided that it is not
   /// shadowed by a previously added suggestion.
   void addSuggestion(Element element,
-      {int relevance = DART_RELEVANCE_DEFAULT}) {
+      {int relevance, bool useNewRelevance = false}) {
     if (element.isPrivate) {
       if (element.library != containingLibrary) {
         // Do not suggest private members for imported libraries
@@ -290,11 +290,16 @@
     }
     String identifier = element.displayName;
 
-    if (relevance == DART_RELEVANCE_DEFAULT && identifier != null) {
-      // Decrease relevance of suggestions starting with $
-      // https://github.com/dart-lang/sdk/issues/27303
-      if (identifier.startsWith(r'$')) {
-        relevance = DART_RELEVANCE_LOW;
+    if (useNewRelevance) {
+      assert(relevance != null);
+    } else {
+      relevance ??= DART_RELEVANCE_DEFAULT;
+      if (relevance == DART_RELEVANCE_DEFAULT && identifier != null) {
+        // Decrease relevance of suggestions starting with $
+        // https://github.com/dart-lang/sdk/issues/27303
+        if (identifier.startsWith(r'$')) {
+          relevance = DART_RELEVANCE_LOW;
+        }
       }
     }
 
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/type_member_contributor.dart b/pkg/analysis_server/lib/src/services/completion/dart/type_member_contributor.dart
index dcd6227..7eb0343 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/type_member_contributor.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/type_member_contributor.dart
@@ -6,12 +6,14 @@
 import 'dart:collection';
 
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
+import 'package:analysis_server/src/services/completion/dart/feature_computer.dart';
 import 'package:analysis_server/src/services/completion/dart/suggestion_builder.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart' as protocol;
 import 'package:analyzer_plugin/src/utilities/visitors/local_declaration_visitor.dart';
+import 'package:meta/meta.dart';
 
 import '../../../protocol_server.dart'
     show CompletionSuggestion, CompletionSuggestionKind;
@@ -22,8 +24,6 @@
   @override
   Future<List<CompletionSuggestion>> computeSuggestions(
       DartCompletionRequest request) async {
-    // TODO(brianwilkerson) Determine whether this await is necessary.
-    await null;
     LibraryElement containingLibrary = request.libraryElement;
     // Gracefully degrade if the library element is not resolved
     // e.g. detached part file or source change
@@ -102,7 +102,7 @@
 
     // Build the suggestions
     if (type is InterfaceType) {
-      _SuggestionBuilder builder = _SuggestionBuilder(containingLibrary);
+      _SuggestionBuilder builder = _SuggestionBuilder(request);
       builder.buildSuggestions(type, containingMethodName,
           mixins: mixins, superclassConstraints: superclassConstraints);
       return builder.suggestions.toList();
@@ -237,8 +237,9 @@
 /// This class provides suggestions based upon the visible instance members in
 /// an interface type.
 class _SuggestionBuilder extends MemberSuggestionBuilder {
-  _SuggestionBuilder(LibraryElement containingLibrary)
-      : super(containingLibrary);
+  final DartCompletionRequest request;
+
+  _SuggestionBuilder(this.request) : super(request.libraryElement);
 
   /// Return completion suggestions for 'dot' completions on the given [type].
   /// If the 'dot' completion is a super expression, then [containingMethodName]
@@ -256,16 +257,34 @@
     if (superclassConstraints != null) {
       types.addAll(superclassConstraints);
     }
+    var featureComputer =
+        FeatureComputer(request.result.typeSystem, request.result.typeProvider);
     for (InterfaceType targetType in types) {
+      var inheritanceDistance = featureComputer.inheritanceDistanceFeature(
+          type.element, targetType.element);
       for (MethodElement method in targetType.methods) {
         // Exclude static methods when completion on an instance
         if (!method.isStatic) {
           // Boost the relevance of a super expression
           // calling a method of the same name as the containing method
-          addSuggestion(method,
-              relevance: method.name == containingMethodName
-                  ? DART_RELEVANCE_HIGH
-                  : DART_RELEVANCE_DEFAULT);
+          int relevance;
+          if (request.useNewRelevance) {
+            var contextType = featureComputer.contextTypeFeature(
+                request.target.containingNode, method.returnType);
+            var superMatches = method.name == containingMethodName ? 1.0 : 0.0;
+            var startsWithDollar =
+                featureComputer.startsWithDollarFeature(method.name);
+            relevance = _computeRelevance(
+                contextType: contextType,
+                inheritanceDistance: inheritanceDistance,
+                startsWithDollar: startsWithDollar,
+                superMatches: superMatches);
+          } else {
+            relevance = method.name == containingMethodName
+                ? DART_RELEVANCE_HIGH
+                : DART_RELEVANCE_DEFAULT;
+          }
+          addSuggestion(method, relevance: relevance);
         }
       }
       for (PropertyAccessorElement propertyAccessor in targetType.accessors) {
@@ -273,10 +292,38 @@
           if (propertyAccessor.isSynthetic) {
             // Avoid visiting a field twice
             if (propertyAccessor.isGetter) {
-              addSuggestion(propertyAccessor.variable);
+              var variable = propertyAccessor.variable;
+              int relevance;
+              if (request.useNewRelevance) {
+                var contextType = featureComputer.contextTypeFeature(
+                    request.target.containingNode, variable.type);
+                var startsWithDollar = featureComputer
+                    .startsWithDollarFeature(propertyAccessor.name);
+                relevance = _computeRelevance(
+                    contextType: contextType,
+                    inheritanceDistance: inheritanceDistance,
+                    startsWithDollar: startsWithDollar,
+                    superMatches: -1.0);
+              }
+              addSuggestion(variable, relevance: relevance);
             }
           } else {
-            addSuggestion(propertyAccessor);
+            var type = propertyAccessor.isGetter
+                ? propertyAccessor.returnType
+                : propertyAccessor.parameters[0].type;
+            int relevance;
+            if (request.useNewRelevance) {
+              var contextType = featureComputer.contextTypeFeature(
+                  request.target.containingNode, type);
+              var startsWithDollar = featureComputer
+                  .startsWithDollarFeature(propertyAccessor.name);
+              relevance = _computeRelevance(
+                  contextType: contextType,
+                  inheritanceDistance: inheritanceDistance,
+                  startsWithDollar: startsWithDollar,
+                  superMatches: -1.0);
+            }
+            addSuggestion(propertyAccessor, relevance: relevance);
           }
         }
       }
@@ -286,6 +333,25 @@
     }
   }
 
+  /// Compute a relevance value from the given feature scores:
+  /// - [contextType] is higher if the type of the element matches the context
+  ///   type,
+  /// - [inheritanceDistance] is higher if the element is defined closer to the
+  ///   target type,
+  /// - [startsWithDollar] is higher if the element's name doe _not_ start with
+  ///   a dollar sign, and
+  /// - [superMatches] is higher if the element is being invoked through `super`
+  ///   and the element's name matches the name of the enclosing method.
+  int _computeRelevance(
+      {@required double contextType,
+      @required double inheritanceDistance,
+      @required double startsWithDollar,
+      @required double superMatches}) {
+    return toRelevance(weightedAverage(
+        [contextType, inheritanceDistance, startsWithDollar, superMatches],
+        [1.0, 1.0, 0.5, 1.0]));
+  }
+
   /// Get a list of [InterfaceType]s that should be searched to find the
   /// possible completions for an object having type [type].
   List<InterfaceType> _getTypeOrdering(InterfaceType type) {
diff --git a/pkg/analysis_server/lib/src/services/correction/dart/remove_unused.dart b/pkg/analysis_server/lib/src/services/correction/dart/remove_unused.dart
index febb28b..525a4ed 100644
--- a/pkg/analysis_server/lib/src/services/correction/dart/remove_unused.dart
+++ b/pkg/analysis_server/lib/src/services/correction/dart/remove_unused.dart
@@ -5,6 +5,7 @@
 import 'package:analysis_server/src/services/correction/dart/abstract_producer.dart';
 import 'package:analysis_server/src/services/correction/fix.dart';
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/source/source_range.dart';
@@ -65,6 +66,7 @@
     if (declaration is! VariableDeclaration) {
       return;
     }
+
     final element = (declaration as VariableDeclaration).declaredElement;
     if (element is! FieldElement) {
       return;
@@ -82,32 +84,13 @@
       if (referenceNode == null) {
         return;
       }
-      var sourceRange;
+      SourceRange sourceRange;
       if (referenceNode is VariableDeclaration) {
-        VariableDeclarationList parent = referenceNode.parent;
-        if (parent.variables.length == 1) {
-          sourceRange = utils.getLinesRange(range.node(parent.parent));
-        } else {
-          sourceRange = range.nodeInList(parent.variables, referenceNode);
-        }
+        sourceRange = _forVariableDeclaration(referenceNode);
       } else if (referenceNode is ConstructorFieldInitializer) {
-        ConstructorDeclaration cons =
-            referenceNode.parent as ConstructorDeclaration;
-        // A() : _f = 0;
-        if (cons.initializers.length == 1) {
-          sourceRange = range.endEnd(cons.parameters, referenceNode);
-        } else {
-          sourceRange = range.nodeInList(cons.initializers, referenceNode);
-        }
+        sourceRange = _forConstructorFieldInitializer(referenceNode);
       } else if (referenceNode is FieldFormalParameter) {
-        FormalParameterList params =
-            referenceNode.parent as FormalParameterList;
-        if (params.parameters.length == 1) {
-          sourceRange =
-              range.endStart(params.leftParenthesis, params.rightParenthesis);
-        } else {
-          sourceRange = range.nodeInList(params.parameters, referenceNode);
-        }
+        sourceRange = _forFieldFormalParameter(referenceNode);
       } else {
         sourceRange = utils.getLinesRange(range.node(referenceNode));
       }
@@ -120,6 +103,64 @@
       }
     });
   }
+
+  SourceRange _forConstructorFieldInitializer(
+    ConstructorFieldInitializer node,
+  ) {
+    final constructor = node.parent as ConstructorDeclaration;
+    if (constructor.initializers.length == 1) {
+      return range.endEnd(constructor.parameters, node);
+    } else {
+      return range.nodeInList(constructor.initializers, node);
+    }
+  }
+
+  SourceRange _forFieldFormalParameter(FieldFormalParameter node) {
+    var parameter = node.parent is DefaultFormalParameter ? node.parent : node;
+    var parameterList = parameter.parent as FormalParameterList;
+
+    // (node) -> ()
+    if (parameterList.parameters.length == 1) {
+      return range.endStart(
+        parameterList.leftParenthesis,
+        parameterList.rightParenthesis,
+      );
+    }
+
+    var prevToken = parameter.beginToken.previous;
+    var nextToken = parameter.endToken.next;
+
+    // (node, tail) -> (tail)
+    if (nextToken.type == TokenType.COMMA) {
+      nextToken = nextToken.next;
+      return range.startStart(parameter.beginToken, nextToken);
+    }
+
+    // (head, node) -> (head)
+    // (head, node, tail) -> (head, tail)
+    var isFirstOptional = prevToken.type == TokenType.OPEN_CURLY_BRACKET ||
+        prevToken.type == TokenType.OPEN_SQUARE_BRACKET;
+    if (isFirstOptional) {
+      prevToken = prevToken.previous;
+    }
+    if (isFirstOptional) {
+      var isLastOptional = nextToken.type == TokenType.CLOSE_CURLY_BRACKET ||
+          nextToken.type == TokenType.CLOSE_SQUARE_BRACKET;
+      if (isLastOptional) {
+        nextToken = nextToken.next;
+      }
+    }
+    return range.endStart(prevToken.previous, nextToken);
+  }
+
+  SourceRange _forVariableDeclaration(VariableDeclaration node) {
+    VariableDeclarationList parent = node.parent;
+    if (parent.variables.length == 1) {
+      return utils.getLinesRange(range.node(parent.parent));
+    } else {
+      return range.nodeInList(parent.variables, node);
+    }
+  }
 }
 
 class _ElementReferenceCollector extends RecursiveAstVisitor<void> {
diff --git a/pkg/analysis_server/lib/src/services/correction/dart/remove_unused_local_variable.dart b/pkg/analysis_server/lib/src/services/correction/dart/remove_unused_local_variable.dart
new file mode 100644
index 0000000..febeea4
--- /dev/null
+++ b/pkg/analysis_server/lib/src/services/correction/dart/remove_unused_local_variable.dart
@@ -0,0 +1,65 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:analysis_server/src/services/correction/dart/abstract_producer.dart';
+import 'package:analysis_server/src/services/correction/fix.dart';
+import 'package:analysis_server/src/services/correction/util.dart';
+import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/source/source_range.dart';
+import 'package:analyzer_plugin/utilities/change_builder/change_builder_dart.dart';
+import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
+import 'package:analyzer_plugin/utilities/range_factory.dart';
+
+class RemoveUnusedLocalVariable extends CorrectionProducer {
+  @override
+  FixKind get fixKind => DartFixKind.REMOVE_UNUSED_LOCAL_VARIABLE;
+
+  @override
+  Future<void> compute(DartChangeBuilder builder) async {
+    final declaration = node.parent;
+    if (!(declaration is VariableDeclaration && declaration.name == node)) {
+      return;
+    }
+    Element element = (declaration as VariableDeclaration).declaredElement;
+    if (element is! LocalElement) {
+      return;
+    }
+
+    final sourceRanges = <SourceRange>[];
+
+    final functionBody = declaration.thisOrAncestorOfType<FunctionBody>();
+    final references = findLocalElementReferences(functionBody, element);
+    for (var reference in references) {
+      final node = reference.thisOrAncestorMatching((node) =>
+          node is VariableDeclaration || node is AssignmentExpression);
+      var sourceRange;
+      if (node is VariableDeclaration) {
+        VariableDeclarationList parent = node.parent;
+        if (parent.variables.length == 1) {
+          sourceRange = utils.getLinesRange(range.node(parent.parent));
+        } else {
+          sourceRange = range.nodeInList(parent.variables, node);
+        }
+      } else if (node is AssignmentExpression) {
+        // todo (pq): consider node.parent is! ExpressionStatement to handle
+        // assignments in parens, etc.
+        if (node.parent is ArgumentList) {
+          sourceRange = range.startStart(node, node.operator.next);
+        } else {
+          sourceRange = utils.getLinesRange(range.node(node.parent));
+        }
+      } else {
+        return;
+      }
+      sourceRanges.add(sourceRange);
+    }
+
+    await builder.addFileEdit(file, (builder) {
+      for (var sourceRange in sourceRanges) {
+        builder.addDeletion(sourceRange);
+      }
+    });
+  }
+}
diff --git a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
index df63966..65b4196 100644
--- a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
+++ b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
@@ -22,6 +22,7 @@
 import 'package:analysis_server/src/services/correction/dart/remove_dead_if_null.dart';
 import 'package:analysis_server/src/services/correction/dart/remove_if_null_operator.dart';
 import 'package:analysis_server/src/services/correction/dart/remove_unused.dart';
+import 'package:analysis_server/src/services/correction/dart/remove_unused_local_variable.dart';
 import 'package:analysis_server/src/services/correction/dart/replace_with_eight_digit_hex.dart';
 import 'package:analysis_server/src/services/correction/dart/wrap_in_future.dart';
 import 'package:analysis_server/src/services/correction/fix.dart';
@@ -380,9 +381,6 @@
     if (errorCode == HintCode.UNUSED_LABEL) {
       await _addFix_removeUnusedLabel();
     }
-    if (errorCode == HintCode.UNUSED_LOCAL_VARIABLE) {
-      await _addFix_removeUnusedLocalVariable();
-    }
     if (errorCode == HintCode.UNUSED_SHOWN_NAME) {
       await _addFix_removeNameFromCombinator();
     }
@@ -3773,54 +3771,6 @@
     }
   }
 
-  Future<void> _addFix_removeUnusedLocalVariable() async {
-    final declaration = node.parent;
-    if (!(declaration is VariableDeclaration && declaration.name == node)) {
-      return;
-    }
-    Element element = (declaration as VariableDeclaration).declaredElement;
-    if (element is! LocalElement) {
-      return;
-    }
-
-    final sourceRanges = <SourceRange>[];
-
-    final functionBody = declaration.thisOrAncestorOfType<FunctionBody>();
-    final references = findLocalElementReferences(functionBody, element);
-    for (var reference in references) {
-      final node = reference.thisOrAncestorMatching((node) =>
-          node is VariableDeclaration || node is AssignmentExpression);
-      var sourceRange;
-      if (node is VariableDeclaration) {
-        VariableDeclarationList parent = node.parent;
-        if (parent.variables.length == 1) {
-          sourceRange = utils.getLinesRange(range.node(parent.parent));
-        } else {
-          sourceRange = range.nodeInList(parent.variables, node);
-        }
-      } else if (node is AssignmentExpression) {
-        // todo (pq): consider node.parent is! ExpressionStatement to handle
-        // assignments in parens, etc.
-        if (node.parent is ArgumentList) {
-          sourceRange = range.startStart(node, node.operator.next);
-        } else {
-          sourceRange = utils.getLinesRange(range.node(node.parent));
-        }
-      } else {
-        return;
-      }
-      sourceRanges.add(sourceRange);
-    }
-
-    final changeBuilder = _newDartChangeBuilder();
-    await changeBuilder.addFileEdit(file, (DartFileEditBuilder builder) {
-      for (var sourceRange in sourceRanges) {
-        builder.addDeletion(sourceRange);
-      }
-    });
-    _addFixFromBuilder(changeBuilder, DartFixKind.REMOVE_UNUSED_LOCAL_VARIABLE);
-  }
-
   Future<void> _addFix_renameToCamelCase() async {
     if (node is! SimpleIdentifier) {
       return;
@@ -4608,6 +4558,8 @@
       await compute(RemoveUnusedElement());
     } else if (errorCode == HintCode.UNUSED_FIELD) {
       await compute(RemoveUnusedField());
+    } else if (errorCode == HintCode.UNUSED_LOCAL_VARIABLE) {
+      await compute(RemoveUnusedLocalVariable());
     } else if (errorCode == StaticWarningCode.DEAD_NULL_AWARE_EXPRESSION) {
       await compute(RemoveDeadIfNull());
     } else if (errorCode is LintCode) {
diff --git a/pkg/analysis_server/test/services/completion/dart/type_member_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/type_member_contributor_test.dart
index bac07e1..b75fd7e 100644
--- a/pkg/analysis_server/test/services/completion/dart/type_member_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/type_member_contributor_test.dart
@@ -16,6 +16,9 @@
   defineReflectiveSuite(() {
     defineReflectiveTests(TypeMemberContributorTest);
     defineReflectiveTests(TypeMemberContributorWithExtensionMethodsTest);
+    defineReflectiveTests(
+        TypeMemberContributorWithExtensionMethodsAndNewRelevanceTest);
+    defineReflectiveTests(TypeMemberContributorWithNewRelevanceTest);
   });
 }
 
@@ -3047,8 +3050,10 @@
     expect(replacementLength, 0);
     assertSuggestGetter('f', 'X');
     assertSuggestGetter('_g', null);
-    assertSuggestField(r'$p', 'dynamic', relevance: DART_RELEVANCE_LOW);
-    assertSuggestMethod(r'$q', 'I', 'void', relevance: DART_RELEVANCE_LOW);
+    assertSuggestField(r'$p', 'dynamic',
+        relevance: useNewRelevance ? null : DART_RELEVANCE_LOW);
+    assertSuggestMethod(r'$q', 'I', 'void',
+        relevance: useNewRelevance ? null : DART_RELEVANCE_LOW);
     assertNotSuggested('b');
     assertNotSuggested('_c');
     assertNotSuggested('d');
@@ -3810,7 +3815,8 @@
     assertNotSuggested('fs2');
     assertSuggestMethod('mi2', 'C2', null);
     assertNotSuggested('ms2');
-    assertSuggestMethod('m', 'C2', null, relevance: DART_RELEVANCE_HIGH);
+    assertSuggestMethod('m', 'C2', null,
+        relevance: useNewRelevance ? null : DART_RELEVANCE_HIGH);
     assertNotSuggested('fi3');
     assertNotSuggested('fs3');
     assertNotSuggested('mi3');
@@ -4229,6 +4235,13 @@
 }
 
 @reflectiveTest
+class TypeMemberContributorWithExtensionMethodsAndNewRelevanceTest
+    extends TypeMemberContributorWithExtensionMethodsTest {
+  @override
+  bool get useNewRelevance => true;
+}
+
+@reflectiveTest
 class TypeMemberContributorWithExtensionMethodsTest
     extends DartCompletionContributorTest {
   @override
@@ -4256,3 +4269,10 @@
     assertNotSuggested('toString');
   }
 }
+
+@reflectiveTest
+class TypeMemberContributorWithNewRelevanceTest
+    extends TypeMemberContributorTest {
+  @override
+  bool get useNewRelevance => true;
+}
diff --git a/pkg/analysis_server/test/src/services/correction/fix/remove_unused_field_test.dart b/pkg/analysis_server/test/src/services/correction/fix/remove_unused_field_test.dart
index f26a92e..b92f401 100644
--- a/pkg/analysis_server/test/src/services/correction/fix/remove_unused_field_test.dart
+++ b/pkg/analysis_server/test/src/services/correction/fix/remove_unused_field_test.dart
@@ -31,6 +31,150 @@
 ''');
   }
 
+  Future<void> test_parameter_optional_first() async {
+    await resolveTestUnit(r'''
+class A {
+  int _f;
+  A([this._f, int x]);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  A([int x]);
+}
+''');
+  }
+
+  Future<void> test_parameter_optional_first_hasRequired() async {
+    await resolveTestUnit(r'''
+class A {
+  int _f;
+  A(int x, [this._f, int y]);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  A(int x, [int y]);
+}
+''');
+  }
+
+  Future<void> test_parameter_optional_last() async {
+    await resolveTestUnit(r'''
+class A {
+  int _f;
+  A([int x, this._f]);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  A([int x]);
+}
+''');
+  }
+
+  Future<void> test_parameter_optional_middle() async {
+    await resolveTestUnit(r'''
+class A {
+  int _f;
+  A([int x, this._f, int y]);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  A([int x, int y]);
+}
+''');
+  }
+
+  Future<void> test_parameter_optional_only() async {
+    await resolveTestUnit(r'''
+class A {
+  int _f;
+  A([this._f]);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  A();
+}
+''');
+  }
+
+  Future<void> test_parameter_optional_only_hasRequired() async {
+    await resolveTestUnit(r'''
+class A {
+  int _f;
+  A(int x, [this._f]);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  A(int x);
+}
+''');
+  }
+
+  Future<void> test_parameter_required_beforeOptional() async {
+    await resolveTestUnit(r'''
+class A {
+  int _f;
+  A(this._f, [int x]);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  A([int x]);
+}
+''');
+  }
+
+  Future<void> test_parameter_required_first() async {
+    await resolveTestUnit(r'''
+class A {
+  int _f;
+  int x;
+  A(this._f, this.x);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  int x;
+  A(this.x);
+}
+''');
+  }
+
+  Future<void> test_parameter_required_last() async {
+    await resolveTestUnit(r'''
+class A {
+  int x;
+  int _f;
+  A(this.x, this._f);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  int x;
+  A(this.x);
+}
+''');
+  }
+
+  Future<void> test_parameter_required_only() async {
+    await resolveTestUnit(r'''
+class A {
+  int _f;
+  A(this._f);
+}
+''');
+    await assertHasFix(r'''
+class A {
+  A();
+}
+''');
+  }
+
   Future<void> test_unusedField_notUsed_assign() async {
     await resolveTestUnit(r'''
 class A {
@@ -148,50 +292,4 @@
 }
 ''');
   }
-
-  Future<void> test_unusedField_notUsed_fieldFormalParameter() async {
-    await resolveTestUnit(r'''
-class A {
-  int _f;
-  A(this._f);
-}
-''');
-    await assertHasFix(r'''
-class A {
-  A();
-}
-''');
-  }
-
-  Future<void> test_unusedField_notUsed_fieldFormalParameter2() async {
-    await resolveTestUnit(r'''
-class A {
-  int _f;
-  int x;
-  A(this._f, this.x);
-}
-''');
-    await assertHasFix(r'''
-class A {
-  int x;
-  A(this.x);
-}
-''');
-  }
-
-  Future<void> test_unusedField_notUsed_fieldFormalParameter3() async {
-    await resolveTestUnit(r'''
-class A {
-  int x;
-  int _f;
-  A(this.x, this._f);
-}
-''');
-    await assertHasFix(r'''
-class A {
-  int x;
-  A(this.x);
-}
-''');
-  }
 }
diff --git a/pkg/analysis_server/test/tool/completion_metrics/metrics_util_test.dart b/pkg/analysis_server/test/tool/completion_metrics/metrics_util_test.dart
index 807acf4..b0163d8 100644
--- a/pkg/analysis_server/test/tool/completion_metrics/metrics_util_test.dart
+++ b/pkg/analysis_server/test/tool/completion_metrics/metrics_util_test.dart
@@ -43,14 +43,14 @@
 
   group('MeanReciprocalRankComputer', () {
     test('empty', () {
-      var mrrc = MeanReciprocalRankComputer();
+      var mrrc = MeanReciprocalRankComputer('');
       expect(mrrc.rankCount, equals(0));
       expect(mrrc.ranks, isEmpty);
       expect(mrrc.getMRR(), equals(0));
     });
 
     test('clear', () {
-      var mrrc = MeanReciprocalRankComputer();
+      var mrrc = MeanReciprocalRankComputer('');
       mrrc.addRank(2);
       expect(mrrc.rankCount, equals(1));
       expect(mrrc.ranks, isNotEmpty);
@@ -61,7 +61,7 @@
     });
 
     test('mmr- single value', () {
-      var mrrc = MeanReciprocalRankComputer();
+      var mrrc = MeanReciprocalRankComputer('');
       mrrc.addRank(3);
       mrrc.addRank(3);
       mrrc.addRank(3);
@@ -73,7 +73,7 @@
     });
 
     test('mmr- example', () {
-      var mrrc = MeanReciprocalRankComputer();
+      var mrrc = MeanReciprocalRankComputer('');
       mrrc.addRank(3);
       mrrc.addRank(2);
       mrrc.addRank(1);
@@ -83,7 +83,7 @@
     });
 
     test('mmr- max rank', () {
-      var mrrc = MeanReciprocalRankComputer();
+      var mrrc = MeanReciprocalRankComputer('');
       mrrc.addRank(3);
       mrrc.addRank(2);
       mrrc.addRank(1);
diff --git a/pkg/analysis_server/tool/completion_metrics/completion_metrics.dart b/pkg/analysis_server/tool/completion_metrics/completion_metrics.dart
index 0c80948..a1ab90c 100644
--- a/pkg/analysis_server/tool/completion_metrics/completion_metrics.dart
+++ b/pkg/analysis_server/tool/completion_metrics/completion_metrics.dart
@@ -11,7 +11,6 @@
 import 'package:analysis_server/src/services/completion/completion_performance.dart';
 import 'package:analysis_server/src/services/completion/dart/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/dart/utilities.dart';
-import 'package:analysis_server/src/status/pages.dart';
 import 'package:analyzer/dart/analysis/analysis_context_collection.dart';
 import 'package:analyzer/dart/analysis/results.dart';
 import 'package:analyzer/diagnostic/diagnostic.dart';
@@ -24,6 +23,7 @@
 import 'package:path/path.dart' as path;
 
 import 'metrics_util.dart';
+import 'utils.dart';
 import 'visitors.dart';
 
 Future<void> main(List<String> args) async {
@@ -60,6 +60,19 @@
   return parser;
 }
 
+/// Print usage information for this tool.
+void printUsage(ArgParser parser, {String error}) {
+  if (error != null) {
+    print(error);
+    print('');
+  }
+  print('usage: dart completion_metrics.dart [options] packagePath');
+  print('');
+  print('Compute code completion health metrics.');
+  print('');
+  print(parser.usage);
+}
+
 /// Return `true` if the command-line arguments (represented by the [result] and
 /// parsed by the [parser]) are valid.
 bool validArguments(ArgParser parser, ArgResults result) {
@@ -78,19 +91,6 @@
   return true;
 }
 
-/// Print usage information for this tool.
-void printUsage(ArgParser parser, {String error}) {
-  if (error != null) {
-    print(error);
-    print('');
-  }
-  print('usage: dart completion_metrics.dart [options] packagePath');
-  print('');
-  print('Compute code completion health metrics.');
-  print('');
-  print(parser.usage);
-}
-
 /// This is the main metrics computer class for code completions. After the
 /// object is constructed, [computeCompletionMetrics] is executed to do analysis
 /// and print a summary of the metrics gathered from the completion tests.
@@ -106,24 +106,24 @@
   /// The int to be returned from the [compute] call.
   int resultCode;
 
-  int includedCount = 0;
-  int notIncludedCount = 0;
-
-  var completionMissedTokenCounter = Counter('missing completion counter');
-  var completionKindCounter = Counter('completion kind counter');
-  var completionElementKindCounter = Counter('completion element kind counter');
-  var mRRComputer = MeanReciprocalRankComputer();
+  var completionCounter = Counter('successful/ unsuccessful completions');
+  var completionMissedTokenCounter =
+      Counter('unsuccessful completion token counter');
+  var completionKindCounter = Counter('unsuccessful completion kind counter');
+  var completionElementKindCounter =
+      Counter('unsuccessful completion element kind counter');
+  var mRRComputer =
+      MeanReciprocalRankComputer('successful/ unsuccessful completions');
+  var typeMemberMRRComputer =
+      MeanReciprocalRankComputer('type member completions');
+  var nonTypeMemberMRRComputer =
+      MeanReciprocalRankComputer('non-type member completions');
 
   CompletionCoverageMetrics(this._rootPath);
 
   /// The path to the current file.
   String get currentFilePath => _currentFilePath;
 
-  /// If the concrete class has this getter return true, then when
-  /// [forEachExpectedCompletion] is called, the [List] of
-  /// [CompletionSuggestion]s will be passed.
-  bool get doComputeCompletionsFromAnalysisServer => true;
-
   /// The analysis root path that this CompletionMetrics class will be computed.
   String get rootPath => _rootPath;
 
@@ -175,12 +175,8 @@
               for (var expectedCompletion in visitor.expectedCompletions) {
                 forEachExpectedCompletion(
                     expectedCompletion,
-                    doComputeCompletionsFromAnalysisServer
-                        ? await _computeCompletionSuggestions(
-                            _resolvedUnitResult,
-                            expectedCompletion.offset,
-                            declarationsTracker)
-                        : null);
+                    await _computeCompletionSuggestions(_resolvedUnitResult,
+                        expectedCompletion.offset, declarationsTracker));
               }
             } catch (e) {
               print('Exception caught analyzing: $filePath');
@@ -204,9 +200,15 @@
     mRRComputer.addRank(place.rank);
 
     if (place.denominator != 0) {
-      includedCount++;
+      completionCounter.count('successful');
+
+      if (isTypeMember(expectedCompletion.syntacticEntity)) {
+        typeMemberMRRComputer.addRank(place.rank);
+      } else {
+        nonTypeMemberMRRComputer.addRank(place.rank);
+      }
     } else {
-      notIncludedCount++;
+      completionCounter.count('unsuccessful');
 
       completionMissedTokenCounter.count(expectedCompletion.completion);
       completionKindCounter.count(expectedCompletion.kind.toString());
@@ -226,10 +228,6 @@
   }
 
   void printAndClearComputers() {
-    final totalCompletionCount = includedCount + notIncludedCount;
-    final percentIncluded = includedCount / totalCompletionCount;
-    final percentNotIncluded = 1 - percentIncluded;
-
     print('');
     completionMissedTokenCounter.printCounterValues();
     print('');
@@ -243,19 +241,22 @@
     mRRComputer.printMean();
     print('');
 
-    print('Summary for $_rootPath:');
-    print('Total number of completion tests   = $totalCompletionCount');
-    print(
-        'Number of successful completions   = $includedCount (${printPercentage(percentIncluded)})');
-    print(
-        'Number of unsuccessful completions = $notIncludedCount (${printPercentage(percentNotIncluded)})');
+    typeMemberMRRComputer.printMean();
+    print('');
 
-    includedCount = 0;
-    notIncludedCount = 0;
+    nonTypeMemberMRRComputer.printMean();
+    print('');
+
+    print('Summary for $_rootPath:');
+    completionCounter.printCounterValues();
+
     completionMissedTokenCounter.clear();
     completionKindCounter.clear();
     completionElementKindCounter.clear();
+    completionCounter.clear();
     mRRComputer.clear();
+    typeMemberMRRComputer.clear();
+    nonTypeMemberMRRComputer.clear();
   }
 
   Future<List<CompletionSuggestion>> _computeCompletionSuggestions(
@@ -299,20 +300,6 @@
     return suggestions;
   }
 
-  List<String> _computeRootPaths(String rootPath, bool corpus) {
-    var roots = <String>[];
-    if (!corpus) {
-      roots.add(rootPath);
-    } else {
-      for (var child in io.Directory(rootPath).listSync()) {
-        if (child is io.Directory) {
-          roots.add(path.join(rootPath, child.path));
-        }
-      }
-    }
-    return roots;
-  }
-
   /// Given some [ResolvedUnitResult] return the first error of high severity
   /// if such an error exists, null otherwise.
   static err.AnalysisError getFirstErrorOrNull(
@@ -336,4 +323,18 @@
     }
     return Place.none();
   }
+
+  static List<String> _computeRootPaths(String rootPath, bool corpus) {
+    var roots = <String>[];
+    if (!corpus) {
+      roots.add(rootPath);
+    } else {
+      for (var child in io.Directory(rootPath).listSync()) {
+        if (child is io.Directory) {
+          roots.add(path.join(rootPath, child.path));
+        }
+      }
+    }
+    return roots;
+  }
 }
diff --git a/pkg/analysis_server/tool/completion_metrics/metrics_util.dart b/pkg/analysis_server/tool/completion_metrics/metrics_util.dart
index 36ca3e6..9e62c61 100644
--- a/pkg/analysis_server/tool/completion_metrics/metrics_util.dart
+++ b/pkg/analysis_server/tool/completion_metrics/metrics_util.dart
@@ -49,8 +49,8 @@
   int getCountOf(String id) => _buckets[id] ?? 0;
 
   void printCounterValues() {
-    print('Counts for \'$name\':');
-    if (totalCount > 0) {
+    print('Counts for \'$name\' (total = $_totalCount):');
+    if (_totalCount > 0) {
       _buckets.forEach((id, count) =>
           print('[$id] $count (${printPercentage(count / _totalCount, 2)})'));
     } else {
@@ -62,8 +62,9 @@
 /// A computer for the mean reciprocal rank,
 /// https://en.wikipedia.org/wiki/Mean_reciprocal_rank.
 class MeanReciprocalRankComputer {
+  final String name;
   final List<int> ranks = [];
-  MeanReciprocalRankComputer();
+  MeanReciprocalRankComputer(this.name);
 
   double getMRR([int maxRank = 0]) {
     if (ranks.isEmpty || maxRank < 0) {
@@ -94,13 +95,12 @@
 
   void printMean() {
     var mrrVal = getMRR();
-    print(
-        'Mean Reciprocal Rank                  = ${mrrVal.toStringAsFixed(6)} '
+    print('Mean Reciprocal Rank \'$name\' (total = $rankCount)');
+    print('mmr   = ${mrrVal.toStringAsFixed(6)} '
         '(inverse = ${(1 / mrrVal).toStringAsFixed(3)})');
 
     var mrrVal5 = getMRR(5);
-    print(
-        'Mean Reciprocal Rank (max rank 5)     = ${mrrVal5.toStringAsFixed(6)} '
+    print('mmr_5 = ${mrrVal5.toStringAsFixed(6)} '
         '(inverse = ${(1 / mrrVal5).toStringAsFixed(3)})');
   }
 }
diff --git a/pkg/analysis_server/tool/completion_metrics/relevance_metrics.dart b/pkg/analysis_server/tool/completion_metrics/relevance_metrics.dart
index 1c5b8bf..8827b91 100644
--- a/pkg/analysis_server/tool/completion_metrics/relevance_metrics.dart
+++ b/pkg/analysis_server/tool/completion_metrics/relevance_metrics.dart
@@ -10,6 +10,7 @@
 import 'package:_fe_analyzer_shared/src/base/syntactic_entity.dart';
 import 'package:analysis_server/src/protocol_server.dart'
     show convertElementToElementKind, ElementKind;
+import 'package:analysis_server/src/services/completion/dart/feature_computer.dart';
 import 'package:analysis_server/src/utilities/flutter.dart';
 import 'package:analyzer/dart/analysis/analysis_context_collection.dart';
 import 'package:analyzer/dart/analysis/results.dart';
@@ -37,8 +38,6 @@
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as path;
 
-import 'feature_computer.dart';
-
 /// Compute metrics to determine whether they should be used to compute a
 /// relevance score for completion suggestions.
 Future<void> main(List<String> args) async {
@@ -570,7 +569,7 @@
     typeProvider = enclosingLibrary.typeProvider;
     typeSystem = enclosingLibrary.typeSystem;
     inheritanceManager = InheritanceManager3();
-    featureComputer = FeatureComputer(typeProvider);
+    featureComputer = FeatureComputer(typeSystem, typeProvider);
 
     for (var directive in node.directives) {
       _recordTokenType('CompilationUnit (directive)', directive,
diff --git a/pkg/analysis_server/tool/completion_metrics/utils.dart b/pkg/analysis_server/tool/completion_metrics/utils.dart
new file mode 100644
index 0000000..33c100c
--- /dev/null
+++ b/pkg/analysis_server/tool/completion_metrics/utils.dart
@@ -0,0 +1,30 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/element/element.dart';
+
+bool isTypeMember(SimpleIdentifier node) {
+  if (node == null || node is! SimpleIdentifier || node.staticElement == null) {
+    return false;
+  }
+  var element = node.staticElement;
+  if (_isStatic(element)) {
+    return false;
+  }
+  return element.enclosingElement is ClassElement;
+}
+
+bool _isStatic(Element element) {
+  if (element is ClassMemberElement) {
+    return element.isStatic;
+  } else if (element is ExecutableElement) {
+    return element.isStatic;
+  } else if (element is FieldElement) {
+    return element.isStatic;
+  } else if (element is VariableElement) {
+    return element.isStatic;
+  }
+  return true;
+}
diff --git a/pkg/analysis_server_client/lib/server.dart b/pkg/analysis_server_client/lib/server.dart
index d8024dd..7dde935 100644
--- a/pkg/analysis_server_client/lib/server.dart
+++ b/pkg/analysis_server_client/lib/server.dart
@@ -28,7 +28,7 @@
 
   /// Replicate all stdout/stderr data from the server process to stdout/stderr,
   /// when true.
-  bool _stdioPassthrough;
+  final bool _stdioPassthrough;
 
   /// Commands that have been sent to the server but not yet acknowledged,
   /// and the [Completer] objects which should be completed
diff --git a/pkg/analyzer/lib/src/dart/analysis/context_locator.dart b/pkg/analyzer/lib/src/dart/analysis/context_locator.dart
index 7edff35..7bfa83f 100644
--- a/pkg/analyzer/lib/src/dart/analysis/context_locator.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/context_locator.dart
@@ -42,11 +42,6 @@
   static const String ANALYSIS_OPTIONS_NAME = 'analysis_options.yaml';
 
   /**
-   * The old name of the analysis options file.
-   */
-  static const String OLD_ANALYSIS_OPTIONS_NAME = '.analysis_options';
-
-  /**
    * The name of the packages file.
    */
   static const String PACKAGES_FILE_NAME = '.packages';
@@ -397,8 +392,7 @@
    * folder does not contain an analysis options file.
    */
   File _getOptionsFile(Folder folder) =>
-      _getFile(folder, ANALYSIS_OPTIONS_NAME) ??
-      _getFile(folder, OLD_ANALYSIS_OPTIONS_NAME);
+      _getFile(folder, ANALYSIS_OPTIONS_NAME);
 
   /**
    * Return the packages file in the given [folder], or `null` if the folder
diff --git a/pkg/analyzer/lib/src/dart/error/lint_codes.dart b/pkg/analyzer/lib/src/dart/error/lint_codes.dart
index f27ad65..53e09ad 100644
--- a/pkg/analyzer/lib/src/dart/error/lint_codes.dart
+++ b/pkg/analyzer/lib/src/dart/error/lint_codes.dart
@@ -19,6 +19,12 @@
   ErrorSeverity get errorSeverity => ErrorSeverity.INFO;
 
   @override
+  int get hashCode => uniqueName.hashCode;
+
+  @override
+  bool operator ==(other) => uniqueName == other.uniqueName;
+
+  @override
   ErrorType get type => ErrorType.LINT;
 
   /**
diff --git a/pkg/analyzer/lib/src/dart/resolver/flow_analysis_visitor.dart b/pkg/analyzer/lib/src/dart/resolver/flow_analysis_visitor.dart
index 353a746..35941b2 100644
--- a/pkg/analyzer/lib/src/dart/resolver/flow_analysis_visitor.dart
+++ b/pkg/analyzer/lib/src/dart/resolver/flow_analysis_visitor.dart
@@ -28,6 +28,10 @@
   /// the corresponding variable has been definitely assigned.
   final List<AstNode> unassignedNodes = [];
 
+  /// The list of [SimpleIdentifier]s representing variable accesses that occur
+  /// when the corresponding variable has been definitely unassigned.
+  final List<AstNode> definitelyUnassignedNodes = [];
+
   /// For each top level or class level declaration, the assigned variables
   /// information that was computed for it.
   final Map<Declaration,
@@ -176,12 +180,17 @@
 
     var element = node.staticElement;
     if (element is LocalVariableElement) {
+      if (flow.isUnassigned(element)) {
+        dataForTesting?.definitelyUnassignedNodes?.add(node);
+      }
+
       var typeSystem = _typeOperations.typeSystem;
       if (typeSystem.isPotentiallyNonNullable(element.type)) {
         var isUnassigned = !flow.isAssigned(element);
         if (isUnassigned) {
           dataForTesting?.unassignedNodes?.add(node);
         }
+
         // Note: in principle we could make this slightly more performant by
         // checking element.isLate earlier, but we would lose the ability to
         // test the flow analysis mechanism using late variables.  And it seems
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index 25334ed..b6d3ae7 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -189,14 +189,10 @@
 /// Instances of the class `ResolverVisitor` are used to resolve the nodes
 /// within a single compilation unit.
 class ResolverVisitor extends ScopedVisitor {
-  /**
-   * The manager for the inheritance mappings.
-   */
+  /// The manager for the inheritance mappings.
   final InheritanceManager3 inheritance;
 
-  /**
-   * The feature set that is enabled for the current unit.
-   */
+  /// The feature set that is enabled for the current unit.
   final FeatureSet _featureSet;
 
   final MigratableAstInfoProvider _migratableAstInfoProvider;
@@ -254,6 +250,10 @@
 
   InferenceContext inferenceContext;
 
+  /// If a class, or mixin, is being resolved, the type of the class.
+  /// Otherwise `null`.
+  DartType _thisType;
+
   /// The object keeping track of which elements have had their types promoted.
   TypePromotionManager _promoteManager;
 
@@ -415,9 +415,17 @@
         : NullabilitySuffix.star;
   }
 
-  /**
-   * Return `true` if NNBD is enabled for this compilation unit.
-   */
+  /// If a class, or mixin, is being resolved, the type of the class.
+  ///
+  /// If an extension is being resolved, the type of `this`, the declared
+  /// extended type, or promoted.
+  ///
+  /// Otherwise `null`.
+  DartType get thisType {
+    return _thisType;
+  }
+
+  /// Return `true` if NNBD is enabled for this compilation unit.
   bool get _isNonNullableByDefault =>
       _featureSet.isEnabled(Feature.non_nullable);
 
@@ -525,7 +533,7 @@
   }) {
     _enclosingClassDeclaration = null;
     enclosingClass = enclosingClassElement;
-    typeAnalyzer.thisType = enclosingClass?.thisType;
+    _thisType = enclosingClass?.thisType;
     _enclosingFunction = enclosingExecutableElement;
   }
 
@@ -533,7 +541,7 @@
   void prepareToResolveMembersInClass(ClassDeclaration node) {
     _enclosingClassDeclaration = node;
     enclosingClass = node.declaredElement;
-    typeAnalyzer.thisType = enclosingClass?.thisType;
+    _thisType = enclosingClass?.thisType;
   }
 
   /// Visit the given [comment] if it is not `null`.
@@ -543,6 +551,11 @@
     }
   }
 
+  @visibleForTesting
+  void setThisInterfaceType(InterfaceType thisType) {
+    _thisType = thisType;
+  }
+
   /// If in a legacy library, return the legacy view on the [element].
   /// Otherwise, return the original element.
   T toLegacyElement<T extends Element>(T element) {
@@ -727,12 +740,12 @@
     ClassElement outerType = enclosingClass;
     try {
       enclosingClass = node.declaredElement;
-      typeAnalyzer.thisType = enclosingClass?.thisType;
+      _thisType = enclosingClass?.thisType;
       super.visitClassDeclaration(node);
       node.accept(elementResolver);
       node.accept(typeAnalyzer);
     } finally {
-      typeAnalyzer.thisType = outerType?.thisType;
+      _thisType = outerType?.thisType;
       enclosingClass = outerType;
       _enclosingClassDeclaration = null;
     }
@@ -956,12 +969,12 @@
     ClassElement outerType = enclosingClass;
     try {
       enclosingClass = node.declaredElement;
-      typeAnalyzer.thisType = enclosingClass?.thisType;
+      _thisType = enclosingClass?.thisType;
       super.visitEnumDeclaration(node);
       node.accept(elementResolver);
       node.accept(typeAnalyzer);
     } finally {
-      typeAnalyzer.thisType = outerType?.thisType;
+      _thisType = outerType?.thisType;
       enclosingClass = outerType;
       _enclosingClassDeclaration = null;
     }
@@ -1005,12 +1018,12 @@
     // Continue the extension resolution.
     //
     try {
-      typeAnalyzer.thisType = node.declaredElement.extendedType;
+      _thisType = node.declaredElement.extendedType;
       super.visitExtensionDeclaration(node);
       node.accept(elementResolver);
       node.accept(typeAnalyzer);
     } finally {
-      typeAnalyzer.thisType = null;
+      _thisType = null;
     }
   }
 
@@ -1372,12 +1385,12 @@
     ClassElement outerType = enclosingClass;
     try {
       enclosingClass = node.declaredElement;
-      typeAnalyzer.thisType = enclosingClass?.thisType;
+      _thisType = enclosingClass?.thisType;
       super.visitMixinDeclaration(node);
       node.accept(elementResolver);
       node.accept(typeAnalyzer);
     } finally {
-      typeAnalyzer.thisType = outerType?.thisType;
+      _thisType = outerType?.thisType;
       enclosingClass = outerType;
       _enclosingMixinDeclaration = null;
     }
diff --git a/pkg/analyzer/lib/src/generated/static_type_analyzer.dart b/pkg/analyzer/lib/src/generated/static_type_analyzer.dart
index 299771f..b47e5e3 100644
--- a/pkg/analyzer/lib/src/generated/static_type_analyzer.dart
+++ b/pkg/analyzer/lib/src/generated/static_type_analyzer.dart
@@ -66,12 +66,6 @@
   bool _strictInference;
 
   /**
-   * The type representing the class containing the nodes being analyzed,
-   * or `null` if the nodes are not within a class.
-   */
-  DartType thisType;
-
-  /**
    * The object providing promoted or declared types of variables.
    */
   LocalVariableTypeProvider _localVariableTypeProvider;
@@ -661,13 +655,13 @@
 
   @override
   void visitSuperExpression(SuperExpression node) {
-    if (thisType == null ||
+    if (_resolver.thisType == null ||
         node.thisOrAncestorOfType<ExtensionDeclaration>() != null) {
       // TODO(brianwilkerson) Report this error if it hasn't already been
       // reported.
       _recordStaticType(node, _dynamicType);
     } else {
-      _recordStaticType(node, thisType);
+      _recordStaticType(node, _resolver.thisType);
     }
   }
 
@@ -682,12 +676,12 @@
    */
   @override
   void visitThisExpression(ThisExpression node) {
-    if (thisType == null) {
+    if (_resolver.thisType == null) {
       // TODO(brianwilkerson) Report this error if it hasn't already been
       // reported.
       _recordStaticType(node, _dynamicType);
     } else {
-      _recordStaticType(node, thisType);
+      _recordStaticType(node, _resolver.thisType);
     }
   }
 
diff --git a/pkg/analyzer/test/generated/static_type_analyzer_test.dart b/pkg/analyzer/test/generated/static_type_analyzer_test.dart
index 0fb0a7f..5936dbd 100644
--- a/pkg/analyzer/test/generated/static_type_analyzer_test.dart
+++ b/pkg/analyzer/test/generated/static_type_analyzer_test.dart
@@ -255,7 +255,7 @@
 
   void setUp() {
     _listener = GatheringErrorListener();
-    _analyzer = _createAnalyzer();
+    _createAnalyzer();
   }
 
   void test_flatten_derived() {
@@ -981,7 +981,7 @@
    * type of 'this'.
    */
   DartType _analyze(Expression node, [InterfaceType thisType]) {
-    _analyzer.thisType = thisType;
+    _visitor.setThisInterfaceType(thisType);
     node.accept(_analyzer);
     return node.staticType;
   }
@@ -1070,7 +1070,7 @@
   /**
    * Create the analyzer used by the tests.
    */
-  StaticTypeAnalyzer _createAnalyzer() {
+  void _createAnalyzer() {
     var context = TestAnalysisContext();
     var inheritance = InheritanceManager3();
     Source source = FileSource(getFile("/lib.dart"));
@@ -1091,7 +1091,7 @@
     _visitor = ResolverVisitor(
         inheritance, _definingLibrary, source, _typeProvider, _listener,
         featureSet: featureSet, nameScope: LibraryScope(_definingLibrary));
-    return _visitor.typeAnalyzer;
+    _analyzer = _visitor.typeAnalyzer;
   }
 
   DartType _flatten(DartType type) => _typeSystem.flatten(type);
diff --git a/pkg/analyzer/test/id_tests/definite_unassignment_test.dart b/pkg/analyzer/test/id_tests/definite_unassignment_test.dart
new file mode 100644
index 0000000..963815a
--- /dev/null
+++ b/pkg/analyzer/test/id_tests/definite_unassignment_test.dart
@@ -0,0 +1,88 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+
+import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
+import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
+import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/null_safety_understanding_flag.dart';
+import 'package:analyzer/src/dart/analysis/testing_data.dart';
+import 'package:analyzer/src/dart/resolver/flow_analysis_visitor.dart';
+import 'package:analyzer/src/util/ast_data_extractor.dart';
+
+import '../util/id_testing_helper.dart';
+
+main(List<String> args) async {
+  Directory dataDir = Directory.fromUri(Platform.script.resolve(
+      '../../../_fe_analyzer_shared/test/flow_analysis/definite_unassignment/'
+      'data'));
+  await NullSafetyUnderstandingFlag.enableNullSafetyTypes(() {
+    return runTests<String>(dataDir,
+        args: args,
+        createUriForFileName: createUriForFileName,
+        onFailure: onFailure,
+        runTest: runTestFor(
+            const _DefiniteAssignmentDataComputer(), [analyzerNnbdConfig]));
+  });
+}
+
+class _DefiniteAssignmentDataComputer extends DataComputer<String> {
+  const _DefiniteAssignmentDataComputer();
+
+  @override
+  DataInterpreter<String> get dataValidator =>
+      const _DefiniteUnassignmentDataInterpreter();
+
+  @override
+  void computeUnitData(TestingData testingData, CompilationUnit unit,
+      Map<Id, ActualData<String>> actualMap) {
+    var flowResult =
+        testingData.uriToFlowAnalysisData[unit.declaredElement.source.uri];
+    _DefiniteUnassignmentDataExtractor(
+            unit.declaredElement.source.uri, actualMap, flowResult)
+        .run(unit);
+  }
+}
+
+class _DefiniteUnassignmentDataExtractor extends AstDataExtractor<String> {
+  final FlowAnalysisDataForTesting _flowResult;
+
+  _DefiniteUnassignmentDataExtractor(
+      Uri uri, Map<Id, ActualData<String>> actualMap, this._flowResult)
+      : super(uri, actualMap);
+
+  @override
+  String computeNodeValue(Id id, AstNode node) {
+    if (node is SimpleIdentifier && node.inGetterContext()) {
+      var element = node.staticElement;
+      if (element is LocalVariableElement || element is ParameterElement) {
+        if (_flowResult.definitelyUnassignedNodes.contains(node)) {
+          return 'unassigned';
+        }
+      }
+    }
+    return null;
+  }
+}
+
+class _DefiniteUnassignmentDataInterpreter implements DataInterpreter<String> {
+  const _DefiniteUnassignmentDataInterpreter();
+
+  @override
+  String getText(String actualData) => actualData;
+
+  @override
+  String isAsExpected(String actualData, String expectedData) {
+    if (actualData == expectedData) {
+      return null;
+    } else {
+      return 'Expected $expectedData, got $actualData';
+    }
+  }
+
+  @override
+  bool isEmpty(String actualData) => actualData == null;
+}
diff --git a/pkg/analyzer/test/src/diagnostics/ambiguous_export_test.dart b/pkg/analyzer/test/src/diagnostics/ambiguous_export_test.dart
index fefeb5e..681a0b5 100644
--- a/pkg/analyzer/test/src/diagnostics/ambiguous_export_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/ambiguous_export_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,7 +10,6 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(AmbiguousExportTest);
-    defineReflectiveTests(AmbiguousExportWithExtensionMethodsTest);
   });
 }
 
@@ -32,14 +29,6 @@
       error(CompileTimeErrorCode.AMBIGUOUS_EXPORT, 20, 19),
     ]);
   }
-}
-
-@reflectiveTest
-class AmbiguousExportWithExtensionMethodsTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
 
   test_extensions_bothExported() async {
     newFile('/test/lib/lib1.dart', content: r'''
diff --git a/pkg/analyzer/test/src/diagnostics/ambiguous_extension_member_access_test.dart b/pkg/analyzer/test/src/diagnostics/ambiguous_extension_member_access_test.dart
index dbc3e39..dc9635c6 100644
--- a/pkg/analyzer/test/src/diagnostics/ambiguous_extension_member_access_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/ambiguous_extension_member_access_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class AmbiguousExtensionMemberAccessTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_call() async {
     await assertErrorsInCode('''
 class A {}
diff --git a/pkg/analyzer/test/src/diagnostics/assignment_to_final_no_setter_test.dart b/pkg/analyzer/test/src/diagnostics/assignment_to_final_no_setter_test.dart
index eca4cef..89f5f56 100644
--- a/pkg/analyzer/test/src/diagnostics/assignment_to_final_no_setter_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/assignment_to_final_no_setter_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,12 +10,24 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(AssignmentToFinalNoSetterTest);
-    defineReflectiveTests(AssignmentToFinalNoSetterWithExtensionMethodsTest);
   });
 }
 
 @reflectiveTest
 class AssignmentToFinalNoSetterTest extends DriverResolutionTest {
+  test_instance_undefined_hasGetter() async {
+    await assertErrorsInCode('''
+extension E on int {
+  int get foo => 0;
+}
+f() {
+  0.foo = 1;
+}
+''', [
+      error(StaticWarningCode.ASSIGNMENT_TO_FINAL_NO_SETTER, 53, 3),
+    ]);
+  }
+
   test_prefixedIdentifier() async {
     await assertErrorsInCode('''
 class A {
@@ -46,25 +56,3 @@
     ]);
   }
 }
-
-@reflectiveTest
-class AssignmentToFinalNoSetterWithExtensionMethodsTest
-    extends AssignmentToFinalNoSetterTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_instance_undefined_hasGetter() async {
-    await assertErrorsInCode('''
-extension E on int {
-  int get foo => 0;
-}
-f() {
-  0.foo = 1;
-}
-''', [
-      error(StaticWarningCode.ASSIGNMENT_TO_FINAL_NO_SETTER, 53, 3),
-    ]);
-  }
-}
diff --git a/pkg/analyzer/test/src/diagnostics/assignment_to_method_test.dart b/pkg/analyzer/test/src/diagnostics/assignment_to_method_test.dart
index fce8b0a..768c9b4 100644
--- a/pkg/analyzer/test/src/diagnostics/assignment_to_method_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/assignment_to_method_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,33 +10,11 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(AssignmentToMethodTest);
-    defineReflectiveTests(AssignmentToMethodWithExtensionMethodsTest);
   });
 }
 
 @reflectiveTest
 class AssignmentToMethodTest extends DriverResolutionTest {
-  test_method() async {
-    await assertErrorsInCode('''
-class A {
-  m() {}
-}
-f(A a) {
-  a.m = () {};
-}''', [
-      error(StaticWarningCode.ASSIGNMENT_TO_METHOD, 32, 3),
-    ]);
-  }
-}
-
-@reflectiveTest
-class AssignmentToMethodWithExtensionMethodsTest
-    extends AssignmentToMethodTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_instance_extendedHasMethod_extensionHasSetter() async {
     await assertErrorsInCode('''
 class C {
@@ -58,6 +34,18 @@
     ]);
   }
 
+  test_method() async {
+    await assertErrorsInCode('''
+class A {
+  m() {}
+}
+f(A a) {
+  a.m = () {};
+}''', [
+      error(StaticWarningCode.ASSIGNMENT_TO_METHOD, 32, 3),
+    ]);
+  }
+
   test_this_extendedHasMethod_extensionHasSetter() async {
     await assertErrorsInCode('''
 class C {
diff --git a/pkg/analyzer/test/src/diagnostics/duplicate_definition_test.dart b/pkg/analyzer/test/src/diagnostics/duplicate_definition_test.dart
index b2ad08a..5c48482 100644
--- a/pkg/analyzer/test/src/diagnostics/duplicate_definition_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/duplicate_definition_test.dart
@@ -2,10 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/dart/error/syntactic_errors.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../generated/test_support.dart';
@@ -330,11 +328,6 @@
 
 @reflectiveTest
 class DuplicateDefinitionExtensionTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_extendedType_instance() async {
     await assertNoErrorsInCode('''
 class A {
diff --git a/pkg/analyzer/test/src/diagnostics/expression_in_map_test.dart b/pkg/analyzer/test/src/diagnostics/expression_in_map_test.dart
index cc3ffe3..0763073 100644
--- a/pkg/analyzer/test/src/diagnostics/expression_in_map_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/expression_in_map_test.dart
@@ -15,8 +15,6 @@
 
 @reflectiveTest
 class ExpressionInMapTest extends DriverResolutionTest {
-  bool get isUiAsCode => analysisOptions.experimentStatus.spread_collections;
-
   test_map() async {
     await assertErrorsInCode('''
 var m = <String, int>{'a', 'b' : 2};
diff --git a/pkg/analyzer/test/src/diagnostics/extension_as_expression_test.dart b/pkg/analyzer/test/src/diagnostics/extension_as_expression_test.dart
index 68d825d..17c8776 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_as_expression_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_as_expression_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class ExtensionAsExpressionTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_prefixedIdentifier() async {
     newFile('/test/lib/a.dart', content: r'''
 extension E on int {}
diff --git a/pkg/analyzer/test/src/diagnostics/extension_conflicting_static_and_instance_test.dart b/pkg/analyzer/test/src/diagnostics/extension_conflicting_static_and_instance_test.dart
index 8749ea7..12ad23a 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_conflicting_static_and_instance_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_conflicting_static_and_instance_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class ExtensionConflictingStaticAndInstanceTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   CompileTimeErrorCode get _errorCode =>
       CompileTimeErrorCode.EXTENSION_CONFLICTING_STATIC_AND_INSTANCE;
 
diff --git a/pkg/analyzer/test/src/diagnostics/extension_declares_abstract_method_test.dart b/pkg/analyzer/test/src/diagnostics/extension_declares_abstract_method_test.dart
index fd46bfb..b85a6d2 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_declares_abstract_method_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_declares_abstract_method_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/dart/error/syntactic_errors.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class ExtensionDeclaresAbstractMethodTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_getter() async {
     await assertErrorsInCode('''
 extension E on String {
diff --git a/pkg/analyzer/test/src/diagnostics/extension_declares_constructor_test.dart b/pkg/analyzer/test/src/diagnostics/extension_declares_constructor_test.dart
index 179288d..ac6219d 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_declares_constructor_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_declares_constructor_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/dart/error/syntactic_errors.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class ExtensionDeclaresConstructorTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_named() async {
     await assertErrorsInCode('''
 extension E on String {
diff --git a/pkg/analyzer/test/src/diagnostics/extension_declares_field_test.dart b/pkg/analyzer/test/src/diagnostics/extension_declares_field_test.dart
index 0a02d01..967a0ce 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_declares_field_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_declares_field_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/dart/error/syntactic_errors.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class ExtensionDeclaresFieldTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_multiple() async {
     await assertErrorsInCode('''
 extension E on String {
diff --git a/pkg/analyzer/test/src/diagnostics/extension_declares_member_of_object_test.dart b/pkg/analyzer/test/src/diagnostics/extension_declares_member_of_object_test.dart
index d4b339e..c959a54 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_declares_member_of_object_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_declares_member_of_object_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class ExtensionDeclaresMemberOfObjectTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_instance_differentKind() async {
     await assertErrorsInCode('''
 extension E on String {
diff --git a/pkg/analyzer/test/src/diagnostics/extension_override_access_to_static_member_test.dart b/pkg/analyzer/test/src/diagnostics/extension_override_access_to_static_member_test.dart
index 829a53f..735a092 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_override_access_to_static_member_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_override_access_to_static_member_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class ExtensionOverrideAccessToStaticMemberTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_call() async {
     await assertErrorsInCode('''
 extension E on int {
diff --git a/pkg/analyzer/test/src/diagnostics/extension_override_argument_not_assignable_test.dart b/pkg/analyzer/test/src/diagnostics/extension_override_argument_not_assignable_test.dart
index 6235401..c8f44a9 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_override_argument_not_assignable_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_override_argument_not_assignable_test.dart
@@ -18,11 +18,6 @@
 
 @reflectiveTest
 class ExtensionOverrideArgumentNotAssignableTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_subtype() async {
     await assertNoErrorsInCode('''
 class A {}
@@ -73,8 +68,7 @@
   @override
   AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
     ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0',
-        additionalFeatures: [Feature.extension_methods, Feature.non_nullable]);
+        sdkVersion: '2.6.0', additionalFeatures: [Feature.non_nullable]);
 
   test_override_onNonNullable() async {
     await assertErrorsInCode(r'''
diff --git a/pkg/analyzer/test/src/diagnostics/extension_override_with_cascade_test.dart b/pkg/analyzer/test/src/diagnostics/extension_override_with_cascade_test.dart
index 5905ad9..dfa1c58 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_override_with_cascade_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_override_with_cascade_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class ExtensionOverrideWithCascadeTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_getter() async {
     await assertErrorsInCode('''
 extension E on int {
diff --git a/pkg/analyzer/test/src/diagnostics/extension_override_without_access_test.dart b/pkg/analyzer/test/src/diagnostics/extension_override_without_access_test.dart
index 05ab324..21a9c6d 100644
--- a/pkg/analyzer/test/src/diagnostics/extension_override_without_access_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/extension_override_without_access_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class ExtensionOverrideWithoutAccessTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_binaryExpression() async {
     await assertNoErrorsInCode('''
 class C {}
diff --git a/pkg/analyzer/test/src/diagnostics/final_not_initialized_test.dart b/pkg/analyzer/test/src/diagnostics/final_not_initialized_test.dart
index 55ac07f..2157307 100644
--- a/pkg/analyzer/test/src/diagnostics/final_not_initialized_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/final_not_initialized_test.dart
@@ -13,7 +13,6 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(FinalNotInitializedTest);
-    defineReflectiveTests(FinalNotInitializedWithExtensionMethodsTest);
     defineReflectiveTests(FinalNotInitializedWithNnbdTest);
   });
 }
@@ -29,6 +28,15 @@
 }''');
   }
 
+  test_extension_static() async {
+    await assertErrorsInCode('''
+extension E on String {
+  static final F;
+}''', [
+      error(StaticWarningCode.FINAL_NOT_INITIALIZED, 39, 1),
+    ]);
+  }
+
   test_instanceField_final() async {
     await assertErrorsInCode('''
 class A {
@@ -67,23 +75,6 @@
 }
 
 @reflectiveTest
-class FinalNotInitializedWithExtensionMethodsTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_static() async {
-    await assertErrorsInCode('''
-extension E on String {
-  static final F;
-}''', [
-      error(StaticWarningCode.FINAL_NOT_INITIALIZED, 39, 1),
-    ]);
-  }
-}
-
-@reflectiveTest
 class FinalNotInitializedWithNnbdTest extends DriverResolutionTest {
   @override
   AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
diff --git a/pkg/analyzer/test/src/diagnostics/inference_failure_on_function_return_type_test.dart b/pkg/analyzer/test/src/diagnostics/inference_failure_on_function_return_type_test.dart
index c0b3cb0..a3f0bd4 100644
--- a/pkg/analyzer/test/src/diagnostics/inference_failure_on_function_return_type_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/inference_failure_on_function_return_type_test.dart
@@ -2,7 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
@@ -12,30 +11,9 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(InferenceFailureOnFunctionReturnTypeTest);
-    defineReflectiveTests(InferenceFailureOnFunctionReturnType_InExtensionTest);
   });
 }
 
-@reflectiveTest
-class InferenceFailureOnFunctionReturnType_InExtensionTest
-    extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods])
-    ..strictInference = true;
-
-  test_extensionMethod() async {
-    await assertErrorsInCode(r'''
-extension E on List {
-  e() {
-    return 7;
-  }
-}
-''', [error(HintCode.INFERENCE_FAILURE_ON_FUNCTION_RETURN_TYPE, 24, 23)]);
-  }
-}
-
 /// Tests of HintCode.INFERENCE_FAILURE_ON_FUNCTION_RETURN_TYPE with the
 /// "strict-inference" static analysis option.
 @reflectiveTest
@@ -132,6 +110,16 @@
 ''');
   }
 
+  test_extensionMethod() async {
+    await assertErrorsInCode(r'''
+extension E on List {
+  e() {
+    return 7;
+  }
+}
+''', [error(HintCode.INFERENCE_FAILURE_ON_FUNCTION_RETURN_TYPE, 24, 23)]);
+  }
+
   test_functionTypedParameter() async {
     await assertErrorsInCode(r'''
 void f(callback()) {
diff --git a/pkg/analyzer/test/src/diagnostics/instance_access_to_static_member_test.dart b/pkg/analyzer/test/src/diagnostics/instance_access_to_static_member_test.dart
index 7eb09d81..0f8682b 100644
--- a/pkg/analyzer/test/src/diagnostics/instance_access_to_static_member_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/instance_access_to_static_member_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,22 +10,12 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(InstanceAccessToStaticMemberTest);
-    defineReflectiveTests(InstanceAccessToStaticMemberWithExtensionMethodsTest);
   });
 }
 
 @reflectiveTest
-class InstanceAccessToStaticMemberTest extends DriverResolutionTest {}
-
-@reflectiveTest
-class InstanceAccessToStaticMemberWithExtensionMethodsTest
-    extends InstanceAccessToStaticMemberTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_getter() async {
+class InstanceAccessToStaticMemberTest extends DriverResolutionTest {
+  test_extension_getter() async {
     await assertErrorsInCode('''
 class C {}
 
@@ -48,7 +36,7 @@
     );
   }
 
-  test_method() async {
+  test_extension_method() async {
     await assertErrorsInCode('''
 class C {}
 
@@ -68,7 +56,7 @@
     );
   }
 
-  test_setter() async {
+  test_extension_setter() async {
     await assertErrorsInCode('''
 class C {}
 
diff --git a/pkg/analyzer/test/src/diagnostics/invalid_extension_argument_count_test.dart b/pkg/analyzer/test/src/diagnostics/invalid_extension_argument_count_test.dart
index 712020b..59375f2 100644
--- a/pkg/analyzer/test/src/diagnostics/invalid_extension_argument_count_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/invalid_extension_argument_count_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class InvalidExtensionArgumentCountTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_many() async {
     await assertErrorsInCode('''
 extension E on String {
diff --git a/pkg/analyzer/test/src/diagnostics/invalid_use_of_covariant_in_extension_test.dart b/pkg/analyzer/test/src/diagnostics/invalid_use_of_covariant_in_extension_test.dart
index 48d6ac3..93d316f 100644
--- a/pkg/analyzer/test/src/diagnostics/invalid_use_of_covariant_in_extension_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/invalid_use_of_covariant_in_extension_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class InvalidUseOfCovariantInExtensionTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_optional_named() async {
     await assertErrorsInCode('''
 extension E on String {
diff --git a/pkg/analyzer/test/src/diagnostics/invalid_use_of_visible_for_testing_member_test.dart b/pkg/analyzer/test/src/diagnostics/invalid_use_of_visible_for_testing_member_test.dart
index 98b2e99..ba4d62f 100644
--- a/pkg/analyzer/test/src/diagnostics/invalid_use_of_visible_for_testing_member_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/invalid_use_of_visible_for_testing_member_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/test_utilities/package_mixin.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ -20,11 +18,6 @@
 @reflectiveTest
 class InvalidUseOfVisibleForTestingMemberTest extends DriverResolutionTest
     with PackageMixin {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_export() async {
     addMetaPackage();
     newFile('/lib1.dart', content: r'''
diff --git a/pkg/analyzer/test/src/diagnostics/invocation_of_extension_without_call_test.dart b/pkg/analyzer/test/src/diagnostics/invocation_of_extension_without_call_test.dart
index ec1bdbb..21e2e99 100644
--- a/pkg/analyzer/test/src/diagnostics/invocation_of_extension_without_call_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/invocation_of_extension_without_call_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class InvocationOfExtensionWithoutCallTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_instance_differentKind() async {
     await assertErrorsInCode('''
 extension E on Object {}
diff --git a/pkg/analyzer/test/src/diagnostics/not_a_type_test.dart b/pkg/analyzer/test/src/diagnostics/not_a_type_test.dart
index 7eb6a9e..8f961ad 100644
--- a/pkg/analyzer/test/src/diagnostics/not_a_type_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/not_a_type_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,12 +10,21 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(NotATypeTest);
-    defineReflectiveTests(NotATypeWithExtensionMethodsTest);
   });
 }
 
 @reflectiveTest
 class NotATypeTest extends DriverResolutionTest {
+  test_extension() async {
+    await assertErrorsInCode('''
+extension E on int {}
+E a;
+''', [error(StaticWarningCode.NOT_A_TYPE, 22, 1)]);
+    var typeName = findNode.typeName('E a;');
+    assertTypeDynamic(typeName.type);
+    assertTypeNull(typeName.name);
+  }
+
   test_function() async {
     await assertErrorsInCode('''
 f() {}
@@ -29,21 +36,3 @@
     ]);
   }
 }
-
-@reflectiveTest
-class NotATypeWithExtensionMethodsTest extends NotATypeTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_extension() async {
-    await assertErrorsInCode('''
-extension E on int {}
-E a;
-''', [error(StaticWarningCode.NOT_A_TYPE, 22, 1)]);
-    var typeName = findNode.typeName('E a;');
-    assertTypeDynamic(typeName.type);
-    assertTypeNull(typeName.name);
-  }
-}
diff --git a/pkg/analyzer/test/src/diagnostics/static_access_to_instance_member_test.dart b/pkg/analyzer/test/src/diagnostics/static_access_to_instance_member_test.dart
index 2eb8c13..db3e52c 100644
--- a/pkg/analyzer/test/src/diagnostics/static_access_to_instance_member_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/static_access_to_instance_member_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,7 +10,6 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(StaticAccessToInstanceMemberTest);
-    defineReflectiveTests(StaticAccessToInstanceMemberWithExtensionMethodsTest);
   });
 }
 
@@ -29,6 +26,45 @@
 ''');
   }
 
+  test_extension_getter() async {
+    await assertErrorsInCode('''
+extension E on int {
+  int get g => 0;
+}
+f() {
+  E.g;
+}
+''', [
+      error(StaticWarningCode.STATIC_ACCESS_TO_INSTANCE_MEMBER, 51, 1),
+    ]);
+  }
+
+  test_extension_method() async {
+    await assertErrorsInCode('''
+extension E on int {
+  void m() {}
+}
+f() {
+  E.m();
+}
+''', [
+      error(StaticWarningCode.STATIC_ACCESS_TO_INSTANCE_MEMBER, 47, 1),
+    ]);
+  }
+
+  test_extension_setter() async {
+    await assertErrorsInCode('''
+extension E on int {
+  void set s(int i) {}
+}
+f() {
+  E.s = 2;
+}
+''', [
+      error(StaticWarningCode.STATIC_ACCESS_TO_INSTANCE_MEMBER, 56, 1),
+    ]);
+  }
+
   test_method_invocation() async {
     await assertErrorsInCode('''
 class A {
@@ -126,51 +162,3 @@
 ''');
   }
 }
-
-@reflectiveTest
-class StaticAccessToInstanceMemberWithExtensionMethodsTest
-    extends StaticAccessToInstanceMemberTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_getter() async {
-    await assertErrorsInCode('''
-extension E on int {
-  int get g => 0;
-}
-f() {
-  E.g;
-}
-''', [
-      error(StaticWarningCode.STATIC_ACCESS_TO_INSTANCE_MEMBER, 51, 1),
-    ]);
-  }
-
-  test_method() async {
-    await assertErrorsInCode('''
-extension E on int {
-  void m() {}
-}
-f() {
-  E.m();
-}
-''', [
-      error(StaticWarningCode.STATIC_ACCESS_TO_INSTANCE_MEMBER, 47, 1),
-    ]);
-  }
-
-  test_setter() async {
-    await assertErrorsInCode('''
-extension E on int {
-  void set s(int i) {}
-}
-f() {
-  E.s = 2;
-}
-''', [
-      error(StaticWarningCode.STATIC_ACCESS_TO_INSTANCE_MEMBER, 56, 1),
-    ]);
-  }
-}
diff --git a/pkg/analyzer/test/src/diagnostics/strict_raw_type_test.dart b/pkg/analyzer/test/src/diagnostics/strict_raw_type_test.dart
index 7478dc18..ed4670e 100644
--- a/pkg/analyzer/test/src/diagnostics/strict_raw_type_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/strict_raw_type_test.dart
@@ -2,7 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/test_utilities/package_mixin.dart';
@@ -13,51 +12,10 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(StrictRawTypeTest);
-    defineReflectiveTests(StrictRawType_WithExtensionsTest);
   });
 }
 
 @reflectiveTest
-class StrictRawType_WithExtensionsTest extends DriverResolutionTest
-    with PackageMixin {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods])
-    ..strictRawTypes = true;
-
-  test_typeOnExtendedType_anonymous_missing() async {
-    await assertErrorsInCode(r'''
-extension on List {}
-''', [error(HintCode.STRICT_RAW_TYPE, 13, 4)]);
-  }
-
-  test_typeOnExtendedType_missing() async {
-    await assertErrorsInCode(r'''
-extension E on List {}
-''', [error(HintCode.STRICT_RAW_TYPE, 15, 4)]);
-  }
-
-  test_typeOnExtendedType_optionalTypeArgs() async {
-    addMetaPackage();
-    await assertNoErrorsInCode(r'''
-import 'package:meta/meta.dart';
-@optionalTypeArgs
-class C<T> {}
-extension E on C {}
-extension on C {}
-''');
-  }
-
-  test_typeOnExtendedType_present() async {
-    await assertNoErrorsInCode(r'''
-extension E<T> on List<T> {}
-extension F on List<int> {}
-''');
-  }
-}
-
-@reflectiveTest
 class StrictRawTypeTest extends DriverResolutionTest with PackageMixin {
   @override
   AnalysisOptionsImpl get analysisOptions =>
@@ -276,6 +234,36 @@
 ''');
   }
 
+  test_typeOnExtendedType_anonymous_missing() async {
+    await assertErrorsInCode(r'''
+extension on List {}
+''', [error(HintCode.STRICT_RAW_TYPE, 13, 4)]);
+  }
+
+  test_typeOnExtendedType_missing() async {
+    await assertErrorsInCode(r'''
+extension E on List {}
+''', [error(HintCode.STRICT_RAW_TYPE, 15, 4)]);
+  }
+
+  test_typeOnExtendedType_optionalTypeArgs() async {
+    addMetaPackage();
+    await assertNoErrorsInCode(r'''
+import 'package:meta/meta.dart';
+@optionalTypeArgs
+class C<T> {}
+extension E on C {}
+extension on C {}
+''');
+  }
+
+  test_typeOnExtendedType_present() async {
+    await assertNoErrorsInCode(r'''
+extension E<T> on List<T> {}
+extension F on List<int> {}
+''');
+  }
+
   test_TypeOnInterface_missing() async {
     await assertErrorsInCode(r'''
 class C<T> {}
diff --git a/pkg/analyzer/test/src/diagnostics/super_in_extension_test.dart b/pkg/analyzer/test/src/diagnostics/super_in_extension_test.dart
index 50c932c..6371a3a 100644
--- a/pkg/analyzer/test/src/diagnostics/super_in_extension_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/super_in_extension_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class SuperInExtensionTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_binaryOperator_inMethod() async {
     await assertErrorsInCode('''
 extension E on int {
diff --git a/pkg/analyzer/test/src/diagnostics/type_argument_not_matching_bounds_test.dart b/pkg/analyzer/test/src/diagnostics/type_argument_not_matching_bounds_test.dart
index 2497f4e..212c026 100644
--- a/pkg/analyzer/test/src/diagnostics/type_argument_not_matching_bounds_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/type_argument_not_matching_bounds_test.dart
@@ -13,9 +13,6 @@
   defineReflectiveSuite(() {
     defineReflectiveTests(TypeArgumentNotMatchingBoundsTest);
     defineReflectiveTests(
-      TypeArgumentNotMatchingBoundsWithExtensionMethodsTest,
-    );
-    defineReflectiveTests(
       TypeArgumentNotMatchingBoundsWithNnbdTest,
     );
   });
@@ -80,6 +77,34 @@
     ]);
   }
 
+  test_extensionOverride_hasTypeArguments() async {
+    await assertErrorsInCode(r'''
+extension E<T extends num> on int {
+  void foo() {}
+}
+
+void f() {
+  E<String>(0).foo();
+}
+''', [
+      error(CompileTimeErrorCode.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS, 70, 6),
+    ]);
+  }
+
+  test_extensionOverride_hasTypeArguments_call() async {
+    await assertErrorsInCode(r'''
+extension E<T extends num> on int {
+  void call() {}
+}
+
+void f() {
+  E<String>(0)();
+}
+''', [
+      error(CompileTimeErrorCode.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS, 71, 6),
+    ]);
+  }
+
   test_fieldFormalParameter() async {
     await assertErrorsInCode(r'''
 class A {}
@@ -377,43 +402,6 @@
 }
 
 @reflectiveTest
-class TypeArgumentNotMatchingBoundsWithExtensionMethodsTest
-    extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_extensionOverride_hasTypeArguments() async {
-    await assertErrorsInCode(r'''
-extension E<T extends num> on int {
-  void foo() {}
-}
-
-void f() {
-  E<String>(0).foo();
-}
-''', [
-      error(CompileTimeErrorCode.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS, 70, 6),
-    ]);
-  }
-
-  test_extensionOverride_hasTypeArguments_call() async {
-    await assertErrorsInCode(r'''
-extension E<T extends num> on int {
-  void call() {}
-}
-
-void f() {
-  E<String>(0)();
-}
-''', [
-      error(CompileTimeErrorCode.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS, 71, 6),
-    ]);
-  }
-}
-
-@reflectiveTest
 class TypeArgumentNotMatchingBoundsWithNnbdTest
     extends TypeArgumentNotMatchingBoundsTest {
   @override
diff --git a/pkg/analyzer/test/src/diagnostics/undefined_extension_getter_test.dart b/pkg/analyzer/test/src/diagnostics/undefined_extension_getter_test.dart
index 22b8d9e..b6a5b55 100644
--- a/pkg/analyzer/test/src/diagnostics/undefined_extension_getter_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/undefined_extension_getter_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class UndefinedExtensionGetterTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_override_defined() async {
     await assertNoErrorsInCode('''
 extension E on String {
diff --git a/pkg/analyzer/test/src/diagnostics/undefined_extension_method_test.dart b/pkg/analyzer/test/src/diagnostics/undefined_extension_method_test.dart
index 29eab14..24a6445 100644
--- a/pkg/analyzer/test/src/diagnostics/undefined_extension_method_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/undefined_extension_method_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class UndefinedExtensionMethodTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_method_defined() async {
     await assertNoErrorsInCode('''
 extension E on String {
diff --git a/pkg/analyzer/test/src/diagnostics/undefined_extension_operator_test.dart b/pkg/analyzer/test/src/diagnostics/undefined_extension_operator_test.dart
index 8d219b4..b03a1f1 100644
--- a/pkg/analyzer/test/src/diagnostics/undefined_extension_operator_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/undefined_extension_operator_test.dart
@@ -2,26 +2,19 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
 
 main() {
   defineReflectiveSuite(() {
-    defineReflectiveTests(UndefinedExtensionMethodTest);
+    defineReflectiveTests(UndefinedExtensionOperatorTest);
   });
 }
 
 @reflectiveTest
-class UndefinedExtensionMethodTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
+class UndefinedExtensionOperatorTest extends DriverResolutionTest {
   test_binary_defined() async {
     await assertNoErrorsInCode('''
 extension E on String {
diff --git a/pkg/analyzer/test/src/diagnostics/undefined_extension_setter_test.dart b/pkg/analyzer/test/src/diagnostics/undefined_extension_setter_test.dart
index 7a2e805..7b798b7c 100644
--- a/pkg/analyzer/test/src/diagnostics/undefined_extension_setter_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/undefined_extension_setter_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -17,11 +15,6 @@
 
 @reflectiveTest
 class UndefinedExtensionSetterTest extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_override_defined() async {
     await assertNoErrorsInCode('''
 extension E on int {
diff --git a/pkg/analyzer/test/src/diagnostics/undefined_getter_test.dart b/pkg/analyzer/test/src/diagnostics/undefined_getter_test.dart
index 6a77a6a..61d9896 100644
--- a/pkg/analyzer/test/src/diagnostics/undefined_getter_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/undefined_getter_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,7 +10,6 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(UndefinedGetterTest);
-    defineReflectiveTests(UndefinedGetterWithExtensionMethodsTest);
   });
 }
 
@@ -46,6 +43,78 @@
     ]);
   }
 
+  test_extension_instance_extendedHasSetter_extensionHasGetter() async {
+    await assertErrorsInCode('''
+class C {
+  void set foo(int _) {}
+}
+
+extension E on C {
+  int get foo => 0;
+
+  f() {
+    this.foo;
+  }
+}
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_GETTER, 95, 3),
+    ]);
+  }
+
+  test_extension_instance_undefined_hasSetter() async {
+    await assertErrorsInCode('''
+extension E on int {
+  void set foo(int _) {}
+}
+f() {
+  0.foo;
+}
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_GETTER, 58, 3),
+    ]);
+  }
+
+  test_extension_instance_withInference() async {
+    await assertErrorsInCode(r'''
+extension E on int {}
+var a = 3.v;
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_GETTER, 32, 1),
+    ]);
+  }
+
+  test_extension_instance_withoutInference() async {
+    await assertErrorsInCode(r'''
+class C {}
+
+extension E on C {}
+
+f(C c) {
+  c.a;
+}
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_GETTER, 46, 1),
+    ]);
+  }
+
+  test_extension_this_extendedHasSetter_extensionHasGetter() async {
+    await assertErrorsInCode('''
+class C {
+  void set foo(int _) {}
+}
+
+extension E on C {
+  int get foo => 0;
+}
+
+f(C c) {
+  c.foo;
+}
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_GETTER, 93, 3),
+    ]);
+  }
+
   test_generic_function_call() async {
     // Referencing `.call` on a `Function` type works similarly to referencing
     // it on `dynamic`--the reference is accepted at compile time, and all type
@@ -272,83 +341,3 @@
 ''');
   }
 }
-
-@reflectiveTest
-class UndefinedGetterWithExtensionMethodsTest extends UndefinedGetterTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_instance_extendedHasSetter_extensionHasGetter() async {
-    await assertErrorsInCode('''
-class C {
-  void set foo(int _) {}
-}
-
-extension E on C {
-  int get foo => 0;
-
-  f() {
-    this.foo;
-  }
-}
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_GETTER, 95, 3),
-    ]);
-  }
-
-  test_instance_undefined_hasSetter() async {
-    await assertErrorsInCode('''
-extension E on int {
-  void set foo(int _) {}
-}
-f() {
-  0.foo;
-}
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_GETTER, 58, 3),
-    ]);
-  }
-
-  test_instance_withInference() async {
-    await assertErrorsInCode(r'''
-extension E on int {}
-var a = 3.v;
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_GETTER, 32, 1),
-    ]);
-  }
-
-  test_instance_withoutInference() async {
-    await assertErrorsInCode(r'''
-class C {}
-
-extension E on C {}
-
-f(C c) {
-  c.a;
-}
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_GETTER, 46, 1),
-    ]);
-  }
-
-  test_this_extendedHasSetter_extensionHasGetter() async {
-    await assertErrorsInCode('''
-class C {
-  void set foo(int _) {}
-}
-
-extension E on C {
-  int get foo => 0;
-}
-
-f(C c) {
-  c.foo;
-}
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_GETTER, 93, 3),
-    ]);
-  }
-}
diff --git a/pkg/analyzer/test/src/diagnostics/undefined_method_test.dart b/pkg/analyzer/test/src/diagnostics/undefined_method_test.dart
index b399b33..6e9bc88 100644
--- a/pkg/analyzer/test/src/diagnostics/undefined_method_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/undefined_method_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,7 +10,6 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(UndefinedMethodTest);
-    defineReflectiveTests(UndefinedMethodWithExtensionMethodsTest);
   });
 }
 
@@ -27,6 +24,44 @@
 ''');
   }
 
+  test_definedInPrivateExtension() async {
+    newFile('/test/lib/lib.dart', content: '''
+class B {}
+
+extension _ on B {
+  void a() {}
+}
+''');
+    await assertErrorsInCode(r'''
+import 'lib.dart';
+
+f(B b) {
+  b.a();
+}
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_METHOD, 33, 1),
+    ]);
+  }
+
+  test_definedInUnnamedExtension() async {
+    newFile('/test/lib/lib.dart', content: '''
+class C {}
+
+extension on C {
+  void a() {}
+}
+''');
+    await assertErrorsInCode(r'''
+import 'lib.dart';
+
+f(C c) {
+  c.a();
+}
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_METHOD, 33, 1),
+    ]);
+  }
+
   test_functionExpression_callMethod_defined() async {
     await assertNoErrorsInCode(r'''
 main() {
@@ -100,17 +135,6 @@
     ]);
   }
 
-  test_method_undefined_mixin_cascade() async {
-    await assertErrorsInCode(r'''
-mixin M {}
-f(M m) {
-  m..abs();
-}
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_METHOD, 25, 3),
-    ]);
-  }
-
   test_method_undefined_mixin() async {
     await assertErrorsInCode(r'''
 mixin M {}
@@ -122,6 +146,17 @@
     ]);
   }
 
+  test_method_undefined_mixin_cascade() async {
+    await assertErrorsInCode(r'''
+mixin M {}
+f(M m) {
+  m..abs();
+}
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_METHOD, 25, 3),
+    ]);
+  }
+
   test_method_undefined_onNull() async {
     await assertErrorsInCode(r'''
 Null f(int x) => null;
@@ -143,52 +178,6 @@
 f() { A?.m(); }
 ''');
   }
-}
-
-@reflectiveTest
-class UndefinedMethodWithExtensionMethodsTest extends UndefinedMethodTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_definedInPrivateExtension() async {
-    newFile('/test/lib/lib.dart', content: '''
-class B {}
-
-extension _ on B {
-  void a() {}
-}
-''');
-    await assertErrorsInCode(r'''
-import 'lib.dart';
-
-f(B b) {
-  b.a();
-}
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_METHOD, 33, 1),
-    ]);
-  }
-
-  test_definedInUnnamedExtension() async {
-    newFile('/test/lib/lib.dart', content: '''
-class C {}
-
-extension on C {
-  void a() {}
-}
-''');
-    await assertErrorsInCode(r'''
-import 'lib.dart';
-
-f(C c) {
-  c.a();
-}
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_METHOD, 33, 1),
-    ]);
-  }
 
   test_withExtension() async {
     await assertErrorsInCode(r'''
diff --git a/pkg/analyzer/test/src/diagnostics/undefined_operator_test.dart b/pkg/analyzer/test/src/diagnostics/undefined_operator_test.dart
index 6ca4c67..8f1ee9f 100644
--- a/pkg/analyzer/test/src/diagnostics/undefined_operator_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/undefined_operator_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,7 +10,6 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(UndefinedOperatorTest);
-    defineReflectiveTests(UndefinedOperatorTestWithExtensionMethodsTest);
   });
 }
 
@@ -116,6 +113,38 @@
     ]);
   }
 
+  test_index_get_extendedHasNone_extensionHasGetter() async {
+    await assertNoErrorsInCode(r'''
+class A {}
+
+extension E on A {
+  int operator[](int index) => 0;
+}
+
+f(A a) {
+  a[0];
+}
+''');
+  }
+
+  test_index_get_extendedHasSetter_extensionHasGetter() async {
+    await assertErrorsInCode(r'''
+class A {
+  void operator[]=(int index, int value) {}
+}
+
+extension E on A {
+  int operator[](int index) => 0;
+}
+
+f(A a) {
+  a[0];
+}
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_OPERATOR, 125, 3),
+    ]);
+  }
+
   test_index_getter() async {
     await assertErrorsInCode(r'''
 class A {}
@@ -149,6 +178,38 @@
     ]);
   }
 
+  test_index_set_extendedHasGetter_extensionHasSetter() async {
+    await assertErrorsInCode(r'''
+class A {
+  int operator[](int index) => 0;
+}
+
+extension E on A {
+  void operator[]=(int index, int value) {}
+}
+
+f(A a) {
+  a[0] = 1;
+}
+''', [
+      error(StaticTypeWarningCode.UNDEFINED_OPERATOR, 125, 3),
+    ]);
+  }
+
+  test_index_set_extendedHasNone_extensionHasSetter() async {
+    await assertNoErrorsInCode(r'''
+class A {}
+
+extension E on A {
+  void operator[]=(int index, int value) {}
+}
+
+f(A a) {
+  a[0] = 1;
+}
+''');
+  }
+
   test_index_setter() async {
     await assertErrorsInCode(r'''
 class A {}
@@ -413,76 +474,3 @@
     ]);
   }
 }
-
-@reflectiveTest
-class UndefinedOperatorTestWithExtensionMethodsTest
-    extends UndefinedOperatorTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_index_get_extendedHasNone_extensionHasGetter() async {
-    await assertNoErrorsInCode(r'''
-class A {}
-
-extension E on A {
-  int operator[](int index) => 0;
-}
-
-f(A a) {
-  a[0];
-}
-''');
-  }
-
-  test_index_get_extendedHasSetter_extensionHasGetter() async {
-    await assertErrorsInCode(r'''
-class A {
-  void operator[]=(int index, int value) {}
-}
-
-extension E on A {
-  int operator[](int index) => 0;
-}
-
-f(A a) {
-  a[0];
-}
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_OPERATOR, 125, 3),
-    ]);
-  }
-
-  test_index_set_extendedHasGetter_extensionHasSetter() async {
-    await assertErrorsInCode(r'''
-class A {
-  int operator[](int index) => 0;
-}
-
-extension E on A {
-  void operator[]=(int index, int value) {}
-}
-
-f(A a) {
-  a[0] = 1;
-}
-''', [
-      error(StaticTypeWarningCode.UNDEFINED_OPERATOR, 125, 3),
-    ]);
-  }
-
-  test_index_set_extendedHasNone_extensionHasSetter() async {
-    await assertNoErrorsInCode(r'''
-class A {}
-
-extension E on A {
-  void operator[]=(int index, int value) {}
-}
-
-f(A a) {
-  a[0] = 1;
-}
-''');
-  }
-}
diff --git a/pkg/analyzer/test/src/diagnostics/undefined_setter_test.dart b/pkg/analyzer/test/src/diagnostics/undefined_setter_test.dart
index 9179738..b845ece 100644
--- a/pkg/analyzer/test/src/diagnostics/undefined_setter_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/undefined_setter_test.dart
@@ -2,18 +2,14 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
-import 'undefined_getter_test.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(UndefinedSetterTest);
-    defineReflectiveTests(UndefinedSetterWithExtensionMethodsTest);
   });
 }
 
@@ -124,14 +120,6 @@
       error(StaticTypeWarningCode.UNDEFINED_SETTER, 54, 3),
     ]);
   }
-}
-
-@reflectiveTest
-class UndefinedSetterWithExtensionMethodsTest extends UndefinedGetterTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
 
   test_withExtension() async {
     await assertErrorsInCode(r'''
diff --git a/pkg/analyzer/test/src/diagnostics/unqualified_reference_to_static_member_of_extended_type_test.dart b/pkg/analyzer/test/src/diagnostics/unqualified_reference_to_static_member_of_extended_type_test.dart
index 9045535..5e5860f 100644
--- a/pkg/analyzer/test/src/diagnostics/unqualified_reference_to_static_member_of_extended_type_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/unqualified_reference_to_static_member_of_extended_type_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -18,11 +16,6 @@
 @reflectiveTest
 class UnqualifiedReferenceToStaticMemberOfExtendedTypeTest
     extends DriverResolutionTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
   test_getter() async {
     await assertErrorsInCode('''
 class MyClass {
diff --git a/pkg/analyzer/test/src/diagnostics/unused_import_test.dart b/pkg/analyzer/test/src/diagnostics/unused_import_test.dart
index 2b7bea9..b1a0884 100644
--- a/pkg/analyzer/test/src/diagnostics/unused_import_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/unused_import_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,7 +10,6 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(UnusedImportTest);
-    defineReflectiveTests(UnusedImportWithExtensionMethodsTest);
   });
 }
 
@@ -134,6 +131,141 @@
 ''');
   }
 
+  test_extension_instance_call() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on int {
+  int call(int x) => 0;
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart';
+
+f() {
+  7(9);
+}
+''');
+  }
+
+  test_extension_instance_getter() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  String get empty => '';
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart';
+
+f() {
+  ''.empty;
+}
+''');
+  }
+
+  test_extension_instance_method() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  String empty() => '';
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart';
+
+f() {
+  ''.empty();
+}
+''');
+  }
+
+  test_extension_instance_operator_binary() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  String operator -(String s) => this;
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart';
+
+f() {
+  'abc' - 'c';
+}
+''');
+  }
+
+  test_extension_instance_operator_index() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on int {
+  int operator [](int i) => 0;
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart';
+
+f() {
+  9[7];
+}
+''');
+  }
+
+  test_extension_instance_operator_unary() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  void operator -() {}
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart';
+
+f() {
+  -'abc';
+}
+''');
+  }
+
+  test_extension_instance_setter() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  void set foo(int i) {}
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart';
+
+f() {
+  'abc'.foo = 2;
+}
+''');
+  }
+
+  test_extension_override_getter() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  String get empty => '';
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart';
+
+f() {
+  E('').empty;
+}
+''');
+  }
+
+  test_extension_static_field() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  static const String empty = '';
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart';
+
+f() {
+  E.empty;
+}
+''');
+  }
+
   test_hide() async {
     newFile('/test/lib/lib1.dart', content: r'''
 class A {}
@@ -168,6 +300,29 @@
 ''');
   }
 
+  test_multipleExtensions() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  String a() => '';
+}
+''');
+    newFile('/test/lib/lib2.dart', content: r'''
+extension E on String {
+  String b() => '';
+}
+''');
+    await assertErrorsInCode('''
+import 'lib1.dart';
+import 'lib2.dart';
+
+f() {
+  ''.b();
+}
+''', [
+      error(HintCode.UNUSED_IMPORT, 7, 11),
+    ]);
+  }
+
   test_prefix_topLevelFunction() async {
     newFile('/test/lib/lib1.dart', content: r'''
 class One {}
@@ -231,169 +386,3 @@
     ]);
   }
 }
-
-@reflectiveTest
-class UnusedImportWithExtensionMethodsTest extends UnusedImportTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_instance_call() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on int {
-  int call(int x) => 0;
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart';
-
-f() {
-  7(9);
-}
-''');
-  }
-
-  test_instance_getter() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  String get empty => '';
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart';
-
-f() {
-  ''.empty;
-}
-''');
-  }
-
-  test_instance_method() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  String empty() => '';
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart';
-
-f() {
-  ''.empty();
-}
-''');
-  }
-
-  test_instance_operator_binary() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  String operator -(String s) => this;
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart';
-
-f() {
-  'abc' - 'c';
-}
-''');
-  }
-
-  test_instance_operator_index() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on int {
-  int operator [](int i) => 0;
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart';
-
-f() {
-  9[7];
-}
-''');
-  }
-
-  test_instance_operator_unary() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  void operator -() {}
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart';
-
-f() {
-  -'abc';
-}
-''');
-  }
-
-  test_instance_setter() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  void set foo(int i) {}
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart';
-
-f() {
-  'abc'.foo = 2;
-}
-''');
-  }
-
-  test_multipleExtensions() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  String a() => '';
-}
-''');
-    newFile('/test/lib/lib2.dart', content: r'''
-extension E on String {
-  String b() => '';
-}
-''');
-    await assertErrorsInCode('''
-import 'lib1.dart';
-import 'lib2.dart';
-
-f() {
-  ''.b();
-}
-''', [
-      error(HintCode.UNUSED_IMPORT, 7, 11),
-    ]);
-  }
-
-  test_override_getter() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  String get empty => '';
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart';
-
-f() {
-  E('').empty;
-}
-''');
-  }
-
-  test_static_field() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  static const String empty = '';
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart';
-
-f() {
-  E.empty;
-}
-''');
-  }
-}
diff --git a/pkg/analyzer/test/src/diagnostics/unused_shown_name_test.dart b/pkg/analyzer/test/src/diagnostics/unused_shown_name_test.dart
index 607437c..6e43f10 100644
--- a/pkg/analyzer/test/src/diagnostics/unused_shown_name_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/unused_shown_name_test.dart
@@ -2,9 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/driver_resolution.dart';
@@ -12,12 +10,44 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(UnusedShownNameTest);
-    defineReflectiveTests(UnusedShownNameWithExtensionMethodsTest);
   });
 }
 
 @reflectiveTest
 class UnusedShownNameTest extends DriverResolutionTest {
+  test_extension_instance_method_unused() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  String empty() => '';
+}
+String s = '';
+''');
+    await assertErrorsInCode('''
+import 'lib1.dart' show E, s;
+
+f() {
+  s.length;
+}
+''', [
+      error(HintCode.UNUSED_SHOWN_NAME, 24, 1),
+    ]);
+  }
+
+  test_extension_instance_method_used() async {
+    newFile('/test/lib/lib1.dart', content: r'''
+extension E on String {
+  String empty() => '';
+}
+''');
+    await assertNoErrorsInCode('''
+import 'lib1.dart' show E;
+
+f() {
+  ''.empty();
+}
+''');
+  }
+
   test_unreferenced() async {
     newFile('/test/lib/lib1.dart', content: r'''
 class A {}
@@ -91,44 +121,3 @@
     ]);
   }
 }
-
-@reflectiveTest
-class UnusedShownNameWithExtensionMethodsTest extends UnusedShownNameTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_instance_method_unused() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  String empty() => '';
-}
-String s = '';
-''');
-    await assertErrorsInCode('''
-import 'lib1.dart' show E, s;
-
-f() {
-  s.length;
-}
-''', [
-      error(HintCode.UNUSED_SHOWN_NAME, 24, 1),
-    ]);
-  }
-
-  test_instance_method_used() async {
-    newFile('/test/lib/lib1.dart', content: r'''
-extension E on String {
-  String empty() => '';
-}
-''');
-    await assertNoErrorsInCode('''
-import 'lib1.dart' show E;
-
-f() {
-  ''.empty();
-}
-''');
-  }
-}
diff --git a/pkg/analyzer/test/src/diagnostics/use_of_void_result_test.dart b/pkg/analyzer/test/src/diagnostics/use_of_void_result_test.dart
index 0571aa2..2613cb9 100644
--- a/pkg/analyzer/test/src/diagnostics/use_of_void_result_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/use_of_void_result_test.dart
@@ -14,7 +14,6 @@
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(UseOfVoidResultTest);
-    defineReflectiveTests(UseOfVoidResultWithExtensionMethodsTest);
     defineReflectiveTests(UseOfVoidResultTest_NonNullable);
   });
 }
@@ -104,6 +103,22 @@
 }''');
   }
 
+  test_extensionApplication() async {
+    await assertErrorsInCode('''
+extension E on String {
+  int get g => 0;
+}
+
+void f() {}
+
+main() {
+  E(f()).g;
+}
+''', [
+      error(StaticWarningCode.USE_OF_VOID_RESULT, 71, 3),
+    ]);
+  }
+
   test_implicitReturnValue() async {
     await assertErrorsInCode(r'''
 f() {}
@@ -546,6 +561,19 @@
     ]);
   }
 
+  test_useOfVoidReturnInExtensionMethod() async {
+    await assertErrorsInCode('''
+extension on void {
+  testVoid() {
+    // No access on void. Static type of `this` is void!
+    this.toString();
+  }
+}
+''', [
+      error(StaticWarningCode.USE_OF_VOID_RESULT, 96, 4),
+    ]);
+  }
+
   @failingTest
   test_useOfVoidReturnInNonVoidFunctionError() async {
     // TODO(mfairhurst) Get this test to pass once codebase is compliant.
@@ -717,40 +745,3 @@
     assertType(findNode.postfix('x!'), 'void');
   }
 }
-
-@reflectiveTest
-class UseOfVoidResultWithExtensionMethodsTest extends UseOfVoidResultTest {
-  @override
-  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
-    ..contextFeatures = FeatureSet.forTesting(
-        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);
-
-  test_useOfVoidReturnInExtensionMethod() async {
-    await assertErrorsInCode('''
-extension on void {
-  testVoid() {
-    // No access on void. Static type of `this` is void!
-    this.toString();
-  }
-}
-''', [
-      error(StaticWarningCode.USE_OF_VOID_RESULT, 96, 4),
-    ]);
-  }
-
-  test_void() async {
-    await assertErrorsInCode('''
-extension E on String {
-  int get g => 0;
-}
-
-void f() {}
-
-main() {
-  E(f()).g;
-}
-''', [
-      error(StaticWarningCode.USE_OF_VOID_RESULT, 71, 3),
-    ]);
-  }
-}
diff --git a/pkg/async_helper/lib/async_helper.dart b/pkg/async_helper/lib/async_helper.dart
index ddab13d..d5bcc08 100644
--- a/pkg/async_helper/lib/async_helper.dart
+++ b/pkg/async_helper/lib/async_helper.dart
@@ -6,8 +6,7 @@
 /// If a test is asynchronous, it needs to notify the testing driver
 /// about this (otherwise tests may get reported as passing [after main()
 /// finished] even if the asynchronous operations fail).
-/// Tests which can't use the unittest framework should use the helper functions
-/// in this library.
+///
 /// This library provides four methods
 ///  - asyncStart(): Needs to be called before an asynchronous operation is
 ///                  scheduled.
diff --git a/pkg/async_helper/lib/async_minitest.dart b/pkg/async_helper/lib/async_minitest.dart
index c7dcb86..3f1b6d8 100644
--- a/pkg/async_helper/lib/async_minitest.dart
+++ b/pkg/async_helper/lib/async_minitest.dart
@@ -6,8 +6,9 @@
 /// unittest/test API used by the language and core library.
 ///
 /// Compared with `minitest.dart`, this library supports and expects
-/// asynchronous tests. It uses a `Zone` per test to collect errors in the
-/// correct test.
+/// asynchronous tests. It uses a `Zone` per test to associate a test name with
+/// the failure.
+///
 /// It does not support `setUp` or `tearDown` methods,
 /// and matchers are severely restricted.
 ///
@@ -42,17 +43,18 @@
 
 void test(String name, body()) {
   var oldName = _pushName(name);
-  var test = new _Test(_currentName)..asyncWait();
-  var result =
-      runZoned(body, zoneValues: {_testToken: test}, onError: test.fail);
+
+  asyncStart();
+  var result = runZoned(body, zoneValues: {_testToken: _currentName});
   if (result is Future) {
     result.then((_) {
-      test.asyncDone();
-    }, onError: test.fail);
+      asyncEnd();
+    });
   } else {
     // Ensure all tests get to be set up first.
-    scheduleMicrotask(test.asyncDone);
+    scheduleMicrotask(asyncEnd);
   }
+
   _popName(oldName);
 }
 
@@ -69,85 +71,84 @@
 }
 
 R Function() expectAsync0<R>(R Function() f, {int count = 1}) {
-  var test = _currentTest..asyncWait(count);
+  asyncStart(count);
   return () {
     var result = f();
-    test.asyncDone();
+    asyncEnd();
     return result;
   };
 }
 
 R Function(A) expectAsync1<R, A>(R Function(A) f, {int count = 1}) {
-  var test = _currentTest..asyncWait(count);
+  asyncStart(count);
   return (A a) {
     var result = f(a);
-    test.asyncDone();
+    asyncEnd();
     return result;
   };
 }
 
 R Function(A, B) expectAsync2<R, A, B>(R Function(A, B) f, {int count = 1}) {
-  var test = _currentTest..asyncWait(count);
+  asyncStart(count);
   return (A a, B b) {
     var result = f(a, b);
-    test.asyncDone();
+    asyncEnd();
     return result;
   };
 }
 
 dynamic expectAsync(Function f, {int count = 1}) {
   var f2 = f; // Avoid type-promoting f, we want dynamic invocations.
-  var test = _currentTest;
   if (f2 is Function(Null, Null, Null, Null, Null)) {
-    test.asyncWait(count);
+    asyncStart(count);
     return ([a, b, c, d, e]) {
       var result = f(a, b, c, d, e);
-      test.asyncDone();
+      asyncEnd();
       return result;
     };
   }
   if (f2 is Function(Null, Null, Null, Null)) {
-    test.asyncWait(count);
+    asyncStart(count);
     return ([a, b, c, d]) {
       var result = f(a, b, c, d);
-      test.asyncDone();
+      asyncEnd();
       return result;
     };
   }
   if (f2 is Function(Null, Null, Null)) {
-    test.asyncWait(count);
+    asyncStart(count);
     return ([a, b, c]) {
       var result = f(a, b, c);
-      test.asyncDone();
+      asyncEnd();
       return result;
     };
   }
   if (f2 is Function(Null, Null)) {
-    test.asyncWait(count);
+    asyncStart(count);
     return ([a, b]) {
       var result = f(a, b);
-      test.asyncDone();
+      asyncEnd();
       return result;
     };
   }
   if (f2 is Function(Null)) {
-    test.asyncWait(count);
+    asyncStart(count);
     return ([a]) {
       var result = f(a);
-      test.asyncDone();
+      asyncEnd();
       return result;
     };
   }
   if (f2 is Function()) {
-    test.asyncWait(count);
+    asyncStart(count);
     return () {
       var result = f();
-      test.asyncDone();
+      asyncEnd();
       return result;
     };
   }
   throw new UnsupportedError(
-      "expectAsync only accepts up to five arguemnt functions");
+      "expectAsync only accepts up to five argument functions");
 }
 
 // Matchers
@@ -212,13 +213,13 @@
 
 void _checkThrow<T>(dynamic v, void onError(error)) {
   if (v is Future) {
-    var test = _currentTest..asyncWait();
+    asyncStart();
     v.then((_) {
       Expect.fail("Did not throw");
     }, onError: (e, s) {
       if (e is! T) throw e;
       if (onError != null) onError(e);
-      test.asyncDone();
+      asyncEnd();
     });
     return;
   }
@@ -251,20 +252,18 @@
 Matcher completion(matcher) => (dynamic o) {
       Expect.type<Future>(o);
       Future future = o;
-      _currentTest.asyncWait();
+      asyncStart();
       future.then((value) {
         expect(value, matcher);
-        _currentTest.asyncDone();
+        asyncEnd();
       });
     };
 
 void completes(dynamic o) {
   Expect.type<Future>(o);
   Future future = o;
-  _currentTest.asyncWait();
-  future.then((_) {
-    _currentTest.asyncDone();
-  });
+  asyncStart();
+  future.then(asyncSuccess);
 }
 
 void isMap(dynamic o) {
@@ -297,12 +296,21 @@
   Expect.fail("$message");
 }
 
-// Internal helpers.
+/// Key for zone value holding current test name.
+final _testToken = Object();
 
-// The current combined name of the nesting [group] or [test].
+bool _initializedTestNameCallback = false;
+
+/// The current combined name of the nesting [group] or [test].
 String _currentName = null;
 
 String _pushName(String newName) {
+  // Look up the current test name from the zone created for the test.
+  if (!_initializedTestNameCallback) {
+    ExpectException.setTestNameCallback(() => Zone.current[_testToken]);
+    _initializedTestNameCallback = true;
+  }
+
   var oldName = _currentName;
   if (oldName == null) {
     _currentName = newName;
@@ -315,73 +323,3 @@
 void _popName(String oldName) {
   _currentName = oldName;
 }
-
-// Key for zone value holding current test object.
-final Object _testToken = new Object();
-
-_Test get _currentTest =>
-    Zone.current[_testToken] ?? (throw new StateError("Not inside test!"));
-
-class _Test {
-  static int activeTests = 0;
-  static int failedTests = 0;
-
-  final String name;
-  bool completed = false;
-  bool failed = false;
-  int asyncExpected = 0;
-  _Test(this.name) {
-    activeTests++;
-  }
-
-  void asyncWait([int n = 1]) {
-    if (completed) {
-      print("ERROR: $name: New operations started after completion."
-          "${StackTrace.current}");
-    } else if (asyncExpected == 0) {
-      asyncStart(); // Matched by asyncEnd in [_complete];
-    }
-    asyncExpected += n;
-  }
-
-  void asyncDone() {
-    if (asyncExpected == 0) {
-      print("ERROR: $name: More asyncEnds than asyncStarts.\n"
-          "${StackTrace.current}");
-    } else {
-      asyncExpected--;
-      if (asyncExpected == 0 && !completed) {
-        print("SUCCESS: $name");
-        _complete();
-      }
-    }
-  }
-
-  void fail(Object error, StackTrace stack) {
-    if (!completed) {
-      failed = true;
-      failedTests++;
-      print("FAILURE: $name: $error\n$stack");
-      _complete();
-    } else {
-      if (!failed) {
-        failed = true;
-        failedTests++;
-      }
-      print("FAILURE: $name: (after completion) $error\n$stack");
-    }
-  }
-
-  void _complete() {
-    assert(!completed);
-    completed = true;
-    activeTests--;
-    if (failedTests == 0) {
-      asyncEnd();
-    } else if (activeTests == 0) {
-      Zone.root.scheduleMicrotask(() {
-        Expect.fail("$failedTests tests failed");
-      });
-    }
-  }
-}
diff --git a/pkg/compiler/lib/src/js_emitter/constant_ordering.dart b/pkg/compiler/lib/src/js_emitter/constant_ordering.dart
index 2b044b3..48281f3 100644
--- a/pkg/compiler/lib/src/js_emitter/constant_ordering.dart
+++ b/pkg/compiler/lib/src/js_emitter/constant_ordering.dart
@@ -245,17 +245,17 @@
 
   @override
   int visitLegacyType(covariant LegacyType type, covariant LegacyType other) =>
-      visit(type.baseType, other.baseType);
+      compare(type.baseType, other.baseType);
 
   @override
   int visitNullableType(
           covariant NullableType type, covariant NullableType other) =>
-      visit(type.baseType, other.baseType);
+      compare(type.baseType, other.baseType);
 
   @override
   int visitFutureOrType(
           covariant FutureOrType type, covariant FutureOrType other) =>
-      visit(type.typeArgument, other.typeArgument);
+      compare(type.typeArgument, other.typeArgument);
 
   @override
   int visitNeverType(covariant NeverType type, covariant NeverType other) {
diff --git a/pkg/compiler/lib/src/ssa/builder_kernel.dart b/pkg/compiler/lib/src/ssa/builder_kernel.dart
index d1c2c14..534cce1 100644
--- a/pkg/compiler/lib/src/ssa/builder_kernel.dart
+++ b/pkg/compiler/lib/src/ssa/builder_kernel.dart
@@ -4043,8 +4043,8 @@
 
     // The type should be a single type name.
     ir.DartType type = types.first;
-    DartType typeValue =
-        localsHandler.substInContext(_elementMap.getDartType(type));
+    DartType typeValue = localsHandler
+        .substInContext(_elementMap.getDartType(type).withoutNullability);
     if (typeValue is! InterfaceType) return false;
     InterfaceType interfaceType = typeValue;
     if (!dartTypes.treatAsRawType(interfaceType)) return false;
diff --git a/pkg/dartdev/analysis_options.yaml b/pkg/dartdev/analysis_options.yaml
index 84a5e26..bafc960 100644
--- a/pkg/dartdev/analysis_options.yaml
+++ b/pkg/dartdev/analysis_options.yaml
@@ -1 +1,14 @@
 include: package:pedantic/analysis_options.1.8.0.yaml
+
+analyzer:
+  errors:
+    # Increase the severity of several hints.
+    prefer_single_quotes: warning
+    unused_import: warning
+    unnecessary_brace_in_string_interps: warning
+
+linter:
+  rules:
+    - directives_ordering
+    - prefer_single_quotes
+    - unnecessary_brace_in_string_interps
diff --git a/pkg/dartdev/lib/src/commands/analyze.dart b/pkg/dartdev/lib/src/commands/analyze.dart
index 8965b45..30b096f 100644
--- a/pkg/dartdev/lib/src/commands/analyze.dart
+++ b/pkg/dartdev/lib/src/commands/analyze.dart
@@ -32,7 +32,7 @@
   @override
   FutureOr<int> run() async {
     if (argResults.rest.length > 1) {
-      usageException("Only one directory is expected.");
+      usageException('Only one directory is expected.');
     }
 
     // find directory from argResults.rest
diff --git a/pkg/dartdev/test/commands/analyze_test.dart b/pkg/dartdev/test/commands/analyze_test.dart
index 4be7ba6..ba4d0b5 100644
--- a/pkg/dartdev/test/commands/analyze_test.dart
+++ b/pkg/dartdev/test/commands/analyze_test.dart
@@ -87,10 +87,10 @@
 
     expect(result.exitCode, 3);
     expect(result.stderr, isEmpty);
-    expect(result.stdout, contains("A value of type "));
-    expect(result.stdout, contains("lib/main.dart:1:16 "));
-    expect(result.stdout, contains("return_of_invalid_type"));
-    expect(result.stdout, contains("1 issue found."));
+    expect(result.stdout, contains('A value of type '));
+    expect(result.stdout, contains('lib/main.dart:1:16 '));
+    expect(result.stdout, contains('return_of_invalid_type'));
+    expect(result.stdout, contains('1 issue found.'));
   });
 
   test('two errors', () {
@@ -99,7 +99,7 @@
 
     expect(result.exitCode, 3);
     expect(result.stderr, isEmpty);
-    expect(result.stdout, contains("2 issues found."));
+    expect(result.stdout, contains('2 issues found.'));
   });
 
   test('warning --fatal-warnings', () {
@@ -110,7 +110,7 @@
     //  should be exitCode == 2, not greater than 0:
     expect(result.exitCode, greaterThan(0));
     expect(result.stderr, isEmpty);
-    expect(result.stdout, contains("1 issue found."));
+    expect(result.stdout, contains('1 issue found.'));
   });
 
   test('warning implicit --fatal-warnings', () {
@@ -121,7 +121,7 @@
     //  should be exitCode == 2, not greater than 0:
     expect(result.exitCode, greaterThan(0));
     expect(result.stderr, isEmpty);
-    expect(result.stdout, contains("1 issue found."));
+    expect(result.stdout, contains('1 issue found.'));
   });
 
   test('warning --no-fatal-warnings', () {
@@ -132,24 +132,24 @@
     //  should be exitCode == 0:
     // expect(result.exitCode, 0);
     expect(result.stderr, isEmpty);
-    expect(result.stdout, contains("1 issue found."));
+    expect(result.stdout, contains('1 issue found.'));
   });
 
   test('info implicit no --fatal-infos', () {
-    p = project(mainSrc: "String foo() {}");
+    p = project(mainSrc: 'String foo() {}');
     var result = p.runSync('analyze', [p.dirPath]);
 
     expect(result.exitCode, 0);
     expect(result.stderr, isEmpty);
-    expect(result.stdout, contains("1 issue found."));
+    expect(result.stdout, contains('1 issue found.'));
   });
 
   test('info --fatal-infos', () {
-    p = project(mainSrc: "String foo() {}");
+    p = project(mainSrc: 'String foo() {}');
     var result = p.runSync('analyze', ['--fatal-infos', p.dirPath]);
 
     expect(result.exitCode, 1);
     expect(result.stderr, isEmpty);
-    expect(result.stdout, contains("1 issue found."));
+    expect(result.stdout, contains('1 issue found.'));
   });
 }
diff --git a/pkg/dartdev/test/commands/format_test.dart b/pkg/dartdev/test/commands/format_test.dart
index 4d8ed8f..74c5c50 100644
--- a/pkg/dartdev/test/commands/format_test.dart
+++ b/pkg/dartdev/test/commands/format_test.dart
@@ -75,7 +75,7 @@
     ProcessResult result = p.runSync('format', [unknownFilePath]);
     expect(result.exitCode, 0);
     expect(result.stderr,
-        startsWith('No file or directory found at "${unknownFilePath}".'));
+        startsWith('No file or directory found at "$unknownFilePath".'));
     expect(result.stdout, isEmpty);
   });
 }
diff --git a/pkg/dartfix/analysis_options.yaml b/pkg/dartfix/analysis_options.yaml
index bef508c..bfb45bf 100644
--- a/pkg/dartfix/analysis_options.yaml
+++ b/pkg/dartfix/analysis_options.yaml
@@ -6,6 +6,7 @@
   errors:
     # Increase the severity of the unused_import hint.
     unused_import: warning
+    unnecessary_brace_in_string_interps: warning
     # There are many pre-existing violations; this lint may not work well with
     # the Analyzer team's style.
     omit_local_variable_types: ignore
diff --git a/pkg/dartfix/lib/src/migrate/migrate.dart b/pkg/dartfix/lib/src/migrate/migrate.dart
index d008d1a..621a03e 100644
--- a/pkg/dartfix/lib/src/migrate/migrate.dart
+++ b/pkg/dartfix/lib/src/migrate/migrate.dart
@@ -83,7 +83,7 @@
       instrumentationLogFile = path.join(
           Directory.systemTemp.createTempSync('migration_debug').path,
           'instrumentationLog');
-      logger.stdout('Instrumentation log file:  ${instrumentationLogFile}');
+      logger.stdout('Instrumentation log file:  $instrumentationLogFile');
     }
 
     Progress progress = getProgress('${ansi.emphasized('Analyzing project')}');
diff --git a/pkg/expect/lib/expect.dart b/pkg/expect/lib/expect.dart
index 83b2ab0..3a3084c 100644
--- a/pkg/expect/lib/expect.dart
+++ b/pkg/expect/lib/expect.dart
@@ -690,9 +690,29 @@
 ///
 /// Always recognized by [Expect.throws] as an unexpected error.
 class ExpectException {
+  /// Call this to provide a function that associates a test name with this
+  /// failure.
+  ///
+  /// Used by async_helper/async_minitest.dart to inject logic to bind the
+  /// `group()` and `test()` name strings to a test failure.
+  static void setTestNameCallback(String Function() getName) {
+    _getTestName = getName;
+  }
+
+  // TODO(rnystrom): Type this `String Function()?` once this library doesn't
+  // need to be NNBD-agnostic.
+  static dynamic _getTestName;
+
   final String message;
-  ExpectException(this.message);
-  String toString() => message;
+  final String name;
+
+  ExpectException(this.message)
+      : name = (_getTestName == null) ? null : _getTestName();
+
+  String toString() {
+    if (name != null) return 'In test "$name" $message';
+    return message;
+  }
 }
 
 /// Is true iff type assertions are enabled.
diff --git a/pkg/front_end/lib/src/fasta/builder/field_builder.dart b/pkg/front_end/lib/src/fasta/builder/field_builder.dart
index 97b2ede..df4c39b 100644
--- a/pkg/front_end/lib/src/fasta/builder/field_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/field_builder.dart
@@ -252,7 +252,7 @@
 
   void build(SourceLibraryBuilder libraryBuilder) {
     if (type != null) {
-      fieldType = type.build(libraryBuilder);
+      fieldType = type.build(libraryBuilder, null, isStatic);
     }
     _fieldEncoding.build(libraryBuilder, this);
   }
diff --git a/pkg/front_end/lib/src/fasta/builder/fixed_type_builder.dart b/pkg/front_end/lib/src/fasta/builder/fixed_type_builder.dart
index 8d18032..7675648 100644
--- a/pkg/front_end/lib/src/fasta/builder/fixed_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/fixed_type_builder.dart
@@ -28,7 +28,10 @@
     return buffer;
   }
 
-  DartType build(LibraryBuilder library, [TypedefType origin]) => type;
+  DartType build(LibraryBuilder library,
+      [TypedefType origin, bool notInstanceContext]) {
+    return type;
+  }
 
   Supertype buildSupertype(
       LibraryBuilder library, int charOffset, Uri fileUri) {
diff --git a/pkg/front_end/lib/src/fasta/builder/function_builder.dart b/pkg/front_end/lib/src/fasta/builder/function_builder.dart
index d16302b..4152697 100644
--- a/pkg/front_end/lib/src/fasta/builder/function_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/function_builder.dart
@@ -9,7 +9,7 @@
 import 'package:front_end/src/fasta/kernel/kernel_api.dart';
 import 'package:kernel/ast.dart';
 
-import 'package:kernel/type_algebra.dart';
+import 'package:kernel/type_algebra.dart' show containsTypeVariable, substitute;
 
 import '../../base/nnbd_mode.dart';
 
@@ -429,13 +429,17 @@
     if (returnType != null) {
       result.returnType = returnType.build(library);
     }
-    if (!isConstructor &&
-        !isDeclarationInstanceMember &&
-        parent is ClassBuilder) {
-      ClassBuilder enclosingClassBuilder = parent;
-      List<TypeParameter> typeParameters =
-          enclosingClassBuilder.cls.typeParameters;
-      if (typeParameters.isNotEmpty) {
+    if (!isConstructor && !isDeclarationInstanceMember) {
+      List<TypeParameter> typeParameters;
+      if (parent is ClassBuilder) {
+        ClassBuilder enclosingClassBuilder = parent;
+        typeParameters = enclosingClassBuilder.cls.typeParameters;
+      } else if (parent is ExtensionBuilder) {
+        ExtensionBuilder enclosingExtensionBuilder = parent;
+        typeParameters = enclosingExtensionBuilder.extension.typeParameters;
+      }
+
+      if (typeParameters != null && typeParameters.isNotEmpty) {
         Map<TypeParameter, DartType> substitution;
         DartType removeTypeVariables(DartType type) {
           if (substitution == null) {
diff --git a/pkg/front_end/lib/src/fasta/builder/function_type_builder.dart b/pkg/front_end/lib/src/fasta/builder/function_type_builder.dart
index c1aa78c1..521e537 100644
--- a/pkg/front_end/lib/src/fasta/builder/function_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/function_type_builder.dart
@@ -71,7 +71,8 @@
     return buffer;
   }
 
-  FunctionType build(LibraryBuilder library, [TypedefType origin]) {
+  FunctionType build(LibraryBuilder library,
+      [TypedefType origin, bool notInstanceContext]) {
     DartType builtReturnType =
         returnType?.build(library) ?? const DynamicType();
     List<DartType> positionalParameters = <DartType>[];
diff --git a/pkg/front_end/lib/src/fasta/builder/mixin_application_builder.dart b/pkg/front_end/lib/src/fasta/builder/mixin_application_builder.dart
index 4387c8e..1991aed 100644
--- a/pkg/front_end/lib/src/fasta/builder/mixin_application_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/mixin_application_builder.dart
@@ -43,7 +43,8 @@
   }
 
   @override
-  InterfaceType build(LibraryBuilder library, [TypedefType origin]) {
+  InterfaceType build(LibraryBuilder library,
+      [TypedefType origin, bool notInstanceContext]) {
     int charOffset = -1; // TODO(ahe): Provide these.
     Uri fileUri = null; // TODO(ahe): Provide these.
     return unsupported("build", charOffset, fileUri);
diff --git a/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart b/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart
index 46e5327..d4601f5 100644
--- a/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart
@@ -6,18 +6,31 @@
 
 import 'package:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
 
-import 'package:kernel/ast.dart' show DartType, Supertype, TypedefType;
+import 'package:kernel/ast.dart'
+    show
+        Class,
+        DartType,
+        Extension,
+        InvalidType,
+        Supertype,
+        TreeNode,
+        TypeParameter,
+        TypedefType;
 
 import '../fasta_codes.dart'
     show
-        Message,
-        Template,
-        noLength,
-        templateMissingExplicitTypeArguments,
-        messageNotATypeContext,
         LocatedMessage,
+        Message,
+        Severity,
+        Template,
+        messageNotATypeContext,
+        messageTypeVariableInStaticContext,
+        noLength,
         templateExtendingRestricted,
+        templateMissingExplicitTypeArguments,
         templateNotAType,
+        templateSupertypeIsIllegal,
+        templateSupertypeIsTypeVariable,
         templateTypeArgumentMismatch,
         templateTypeArgumentsOnTypeVariable,
         templateTypeNotFound;
@@ -50,14 +63,18 @@
 
   final NullabilityBuilder nullabilityBuilder;
 
+  final Uri fileUri;
+  final int charOffset;
+
   @override
   TypeDeclarationBuilder declaration;
 
-  NamedTypeBuilder(this.name, this.nullabilityBuilder, this.arguments);
+  NamedTypeBuilder(this.name, this.nullabilityBuilder, this.arguments,
+      [this.fileUri, this.charOffset]);
 
   NamedTypeBuilder.fromTypeDeclarationBuilder(
       this.declaration, this.nullabilityBuilder,
-      [this.arguments])
+      [this.arguments, this.fileUri, this.charOffset])
       : this.name = declaration.name;
 
   @override
@@ -218,8 +235,23 @@
   }
 
   // TODO(johnniwinther): Store [origin] on the built type.
-  DartType build(LibraryBuilder library, [TypedefType origin]) {
+  DartType build(LibraryBuilder library,
+      [TypedefType origin, bool notInstanceContext]) {
     assert(declaration != null, "Declaration has not been resolved on $this.");
+    if (notInstanceContext == true && declaration.isTypeVariable) {
+      TypeVariableBuilder typeParameterBuilder = declaration;
+      TypeParameter typeParameter = typeParameterBuilder.parameter;
+      if (typeParameter.parent is Class || typeParameter.parent is Extension) {
+        messageTypeVariableInStaticContext;
+        library.addProblem(
+            messageTypeVariableInStaticContext,
+            charOffset ?? TreeNode.noOffset,
+            noLength,
+            fileUri ?? library.fileUri);
+        return const InvalidType();
+      }
+    }
+
     return declaration.buildType(library, nullabilityBuilder, arguments);
   }
 
diff --git a/pkg/front_end/lib/src/fasta/builder/type_builder.dart b/pkg/front_end/lib/src/fasta/builder/type_builder.dart
index d3e7c8e..01d5a33 100644
--- a/pkg/front_end/lib/src/fasta/builder/type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/type_builder.dart
@@ -55,7 +55,8 @@
 
   String get fullNameForErrors => "${printOn(new StringBuffer())}";
 
-  DartType build(LibraryBuilder library, [TypedefType origin]);
+  DartType build(LibraryBuilder library,
+      [TypedefType origin, bool notInstanceContext]);
 
   Supertype buildSupertype(LibraryBuilder library, int charOffset, Uri fileUri);
 
diff --git a/pkg/front_end/lib/src/fasta/builder/type_variable_builder.dart b/pkg/front_end/lib/src/fasta/builder/type_variable_builder.dart
index c34ef54..277e05c 100644
--- a/pkg/front_end/lib/src/fasta/builder/type_variable_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/type_variable_builder.dart
@@ -127,7 +127,8 @@
   }
 
   TypeBuilder asTypeBuilder() {
-    return new NamedTypeBuilder(name, const NullabilityBuilder.omitted(), null)
+    return new NamedTypeBuilder(
+        name, const NullabilityBuilder.omitted(), null, fileUri, charOffset)
       ..bind(this);
   }
 
diff --git a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
index a302ce4..7cadadf 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
@@ -6,6 +6,8 @@
 
 import 'dart:core' hide MapEntry;
 
+import 'package:kernel/type_algebra.dart' show containsTypeVariable, substitute;
+
 import 'package:_fe_analyzer_shared/src/flow_analysis/flow_analysis.dart';
 
 import 'package:_fe_analyzer_shared/src/messages/severity.dart' show Severity;
@@ -3088,8 +3090,12 @@
         libraryBuilder.addProblem(
             message, offset, lengthOfSpan(beginToken, suffix), uri);
         push(new UnresolvedType(
-            new NamedTypeBuilder(name,
-                libraryBuilder.nullableBuilderIfTrue(isMarkedAsNullable), null)
+            new NamedTypeBuilder(
+                name,
+                libraryBuilder.nullableBuilderIfTrue(isMarkedAsNullable),
+                null,
+                uri,
+                offset)
               ..bind(new InvalidTypeDeclarationBuilder(
                   name,
                   message.withLocation(
@@ -3178,7 +3184,8 @@
     int offset = offsetForToken(token);
     // "void" is always nullable.
     push(new UnresolvedType(
-        new NamedTypeBuilder("void", const NullabilityBuilder.nullable(), null)
+        new NamedTypeBuilder(
+            "void", const NullabilityBuilder.nullable(), null, uri, offset)
           ..bind(new VoidTypeBuilder(const VoidType(), libraryBuilder, offset)),
         offset,
         uri));
@@ -4456,6 +4463,53 @@
     enterFunction();
   }
 
+  _checkTypeParameters(FunctionNode function) {
+    if (member == null) return;
+    if (!member.isStatic) return;
+    List<TypeParameter> typeParameters;
+    if (member.parent is ClassBuilder) {
+      ClassBuilder enclosingClassBuilder = member.parent;
+      typeParameters = enclosingClassBuilder.cls.typeParameters;
+    } else if (member.parent is ExtensionBuilder) {
+      ExtensionBuilder enclosingExtensionBuilder = member.parent;
+      typeParameters = enclosingExtensionBuilder.extension.typeParameters;
+    }
+    if (typeParameters != null && typeParameters.isNotEmpty) {
+      Map<TypeParameter, DartType> substitution;
+      DartType removeTypeVariables(DartType type, int offset) {
+        if (substitution == null) {
+          substitution = <TypeParameter, DartType>{};
+          for (TypeParameter parameter in typeParameters) {
+            substitution[parameter] = const DynamicType();
+          }
+        }
+        libraryBuilder.addProblem(fasta.messageNonInstanceTypeVariableUse,
+            offset, noLength, member.fileUri);
+        return substitute(type, substitution);
+      }
+
+      Set<TypeParameter> set = typeParameters.toSet();
+      for (VariableDeclaration parameter in function.positionalParameters) {
+        parameter.fileOffset;
+        if (containsTypeVariable(parameter.type, set)) {
+          parameter.type =
+              removeTypeVariables(parameter.type, parameter.fileOffset);
+        }
+      }
+      for (VariableDeclaration parameter in function.namedParameters) {
+        if (containsTypeVariable(parameter.type, set)) {
+          parameter.type =
+              removeTypeVariables(parameter.type, parameter.fileOffset);
+        }
+      }
+      if (containsTypeVariable(function.returnType, set)) {
+        // TODO(CFE Team): The offset here doesn't actually point to the type.
+        function.returnType =
+            removeTypeVariables(function.returnType, function.fileOffset);
+      }
+    }
+  }
+
   void pushNamedFunction(Token token, bool isFunctionExpression) {
     Statement body = popStatement();
     AsyncMarker asyncModifier = pop();
@@ -4472,6 +4526,7 @@
     }
     FunctionNode function = formals.buildFunctionNode(libraryBuilder,
         returnType, typeParameters, asyncModifier, body, token.charOffset);
+    _checkTypeParameters(function);
 
     if (declaration is FunctionDeclaration) {
       VariableDeclaration variable = declaration.variable;
@@ -4559,6 +4614,7 @@
     FunctionNode function = formals.buildFunctionNode(libraryBuilder, null,
         typeParameters, asyncModifier, body, token.charOffset)
       ..fileOffset = beginToken.charOffset;
+    _checkTypeParameters(function);
 
     Expression result;
     if (constantContext != ConstantContext.none) {
@@ -5677,21 +5733,9 @@
     if (builder is NamedTypeBuilder && builder.declaration.isTypeVariable) {
       TypeVariableBuilder typeParameterBuilder = builder.declaration;
       TypeParameter typeParameter = typeParameterBuilder.parameter;
-      LocatedMessage message;
-      if (!isDeclarationInstanceContext && typeParameter.parent is Class) {
-        message = fasta.messageTypeVariableInStaticContext.withLocation(
-            unresolved.fileUri,
-            unresolved.charOffset,
-            typeParameter.name.length);
-      } else if (constantContext == ConstantContext.inferred) {
-        message = fasta.messageTypeVariableInConstantContext.withLocation(
-            unresolved.fileUri,
-            unresolved.charOffset,
-            typeParameter.name.length);
-      } else {
-        return unresolved;
-      }
-      addProblem(message.messageObject, message.charOffset, message.length);
+      LocatedMessage message = _validateTypeUseIsInternal(
+          builder, unresolved.fileUri, unresolved.charOffset);
+      if (message == null) return unresolved;
       return new UnresolvedType(
           new NamedTypeBuilder(
               typeParameter.name, builder.nullabilityBuilder, null)
@@ -5699,10 +5743,56 @@
                 new InvalidTypeDeclarationBuilder(typeParameter.name, message)),
           unresolved.charOffset,
           unresolved.fileUri);
+    } else if (builder is FunctionTypeBuilder) {
+      LocatedMessage message = _validateTypeUseIsInternal(
+          builder, unresolved.fileUri, unresolved.charOffset);
+      if (message == null) return unresolved;
+      // TODO(CFE Team): This should probably be some kind of InvalidType
+      // instead of null.
+      return new UnresolvedType(
+          null, unresolved.charOffset, unresolved.fileUri);
     }
     return unresolved;
   }
 
+  LocatedMessage _validateTypeUseIsInternal(
+      TypeBuilder builder, Uri fileUri, int charOffset) {
+    if (builder is NamedTypeBuilder && builder.declaration.isTypeVariable) {
+      TypeVariableBuilder typeParameterBuilder = builder.declaration;
+      TypeParameter typeParameter = typeParameterBuilder.parameter;
+      LocatedMessage message;
+      if (!isDeclarationInstanceContext &&
+          (typeParameter.parent is Class ||
+              typeParameter.parent is Extension)) {
+        message = fasta.messageTypeVariableInStaticContext
+            .withLocation(fileUri, charOffset, typeParameter.name.length);
+      } else if (constantContext == ConstantContext.inferred) {
+        message = fasta.messageTypeVariableInConstantContext
+            .withLocation(fileUri, charOffset, typeParameter.name.length);
+      } else {
+        return null;
+      }
+      addProblem(message.messageObject, message.charOffset, message.length);
+      return message;
+    } else if (builder is FunctionTypeBuilder) {
+      LocatedMessage result =
+          _validateTypeUseIsInternal(builder.returnType, fileUri, charOffset);
+      if (result != null) {
+        return result;
+      }
+      if (builder.formals != null) {
+        for (FormalParameterBuilder formalParameterBuilder in builder.formals) {
+          result = _validateTypeUseIsInternal(
+              formalParameterBuilder.type, fileUri, charOffset);
+          if (result != null) {
+            return result;
+          }
+        }
+      }
+    }
+    return null;
+  }
+
   @override
   Expression evaluateArgumentsBefore(
       Arguments arguments, Expression expression) {
diff --git a/pkg/front_end/lib/src/fasta/kernel/inference_visitor.dart b/pkg/front_end/lib/src/fasta/kernel/inference_visitor.dart
index f91bfea..60fa08e 100644
--- a/pkg/front_end/lib/src/fasta/kernel/inference_visitor.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/inference_visitor.dart
@@ -5546,6 +5546,11 @@
       }
     }
 
+    if (inferrer.flowAnalysis.isUnassigned(variable)) {
+      inferrer.dataForTesting?.flowAnalysisResult?.definitelyUnassignedNodes
+          ?.add(node);
+    }
+
     DartType promotedType;
     DartType declaredOrInferredType = variable.lateType ?? variable.type;
     if (inferrer.isNonNullableByDefault) {
diff --git a/pkg/front_end/lib/src/fasta/source/outline_builder.dart b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
index 33555b8..b2a1e9e 100644
--- a/pkg/front_end/lib/src/fasta/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
@@ -1865,7 +1865,11 @@
                     builder.name, via.join("', '"));
             addProblem(message, builder.charOffset, builder.name.length);
             builder.bound = new NamedTypeBuilder(
-                builder.name, const NullabilityBuilder.omitted(), null)
+                builder.name,
+                const NullabilityBuilder.omitted(),
+                null,
+                uri,
+                builder.charOffset)
               ..bind(new InvalidTypeDeclarationBuilder(
                   builder.name,
                   message.withLocation(
diff --git a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
index 6e651ce..8f4d344 100644
--- a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
@@ -387,16 +387,8 @@
       loader.target.enableNonNullable &&
       languageVersion.major >= enableNonNullableMajorVersion &&
       languageVersion.minor >= enableNonNullableMinorVersion &&
-      !isOptOutPackage(library.importUri) &&
       !isOptOutTest(library.importUri);
 
-  bool isOptOutPackage(Uri uri) {
-    if (!uri.isScheme('package')) return false;
-    if (uri.pathSegments.isEmpty) return false;
-    String packageName = uri.pathSegments.first;
-    return optOutPackages.contains(packageName);
-  }
-
   bool isOptOutTest(Uri uri) {
     String path = uri.path;
     for (String testDir in ['/tests/', '/generated_tests/']) {
@@ -409,120 +401,6 @@
     return false;
   }
 
-  // TODO(johnniwinther): remove this logic. Opted out packages should be
-  // computed using language versioning and .packages.json.
-  static final Set<String> optOutPackages = {
-    '_fe_analyzer_shared',
-    'analysis_server',
-    'analysis_server_client',
-    'analysis_tool',
-    'analyzer',
-    'analyzer_cli',
-    'analyzer_fe_comparison',
-    'analyzer_plugin',
-    'args',
-    'async',
-    'async_helper',
-    'bazel_worker',
-    'benchmark_harness',
-    'boolean_selector',
-    'build_integration',
-    'charcode',
-    'cli_util',
-    'collection',
-    'compiler',
-    'convert',
-    'crypto',
-    'csslib',
-    'dart2js_info',
-    'dart2js_tools',
-    'dart2native',
-    'dart_internal',
-    'dart_style',
-    'dartdoc',
-    'dartfix',
-    'dev_compiler',
-    'diagnostic',
-    'expect',
-    'ffi',
-    'fixnum',
-    'frontend_server',
-    'front_end',
-    'gardening',
-    'glob',
-    'html',
-    'http',
-    'http_io',
-    'http_multi_server',
-    'http_parser',
-    'http_retry',
-    'http_throttle',
-    'intl',
-    'js',
-    'js_ast',
-    'js_runtime',
-    'json_rpc_2',
-    'kernel',
-    'linter',
-    'logging',
-    'markdown',
-    'matcher',
-    'meta',
-    'mime',
-    'mockito',
-    'modular_test',
-    'mustache',
-    'native_stack_traces',
-    'nnbd_migration',
-    'oauth2',
-    'observatory',
-    'observatory_test_package',
-    'package_config',
-    'package_resolver',
-    'path',
-    'pedantic',
-    'pool',
-    'protobuf',
-    'pub',
-    'pub_semver',
-    'quiver',
-    'resource',
-    'sdk_library_metadata',
-    'shelf',
-    'shelf_packages_handler',
-    'shelf_static',
-    'shelf_web_socket',
-    'smith',
-    'source_map_stack_trace',
-    'sourcemap_testing',
-    'source_maps',
-    'source_span',
-    'stack_trace',
-    'status_file',
-    'stream_channel',
-    'string_scanner',
-    'telemetry',
-    'term_glyph',
-    'test',
-    'test_api',
-    'test_core',
-    'test_descriptor',
-    'test_process',
-    'test_reflective_loader',
-    'test_runner',
-    'testing',
-    'tflite_native',
-    'typed_data',
-    'unittest',
-    'usage',
-    'vm',
-    'vm_service',
-    'watcher',
-    'web_components',
-    'web_socket_channel',
-    'yaml',
-  };
-
   static final Set<String> optOutTestPaths = {
     '/tests/co19_2',
     '/tests/corelib_2',
@@ -1384,7 +1262,9 @@
   TypeBuilder addNamedType(Object name, NullabilityBuilder nullabilityBuilder,
       List<TypeBuilder> arguments, int charOffset) {
     return addType(
-        new NamedTypeBuilder(name, nullabilityBuilder, arguments), charOffset);
+        new NamedTypeBuilder(
+            name, nullabilityBuilder, arguments, fileUri, charOffset),
+        charOffset);
   }
 
   TypeBuilder addMixinApplication(
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart b/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
index 20de17c..7b57b07 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
@@ -238,6 +238,10 @@
   /// the corresponding variable has been definitely assigned.
   final List<TreeNode> unassignedNodes = [];
 
+  /// The list of [Expression]s representing variable accesses that occur when
+  /// the corresponding variable has been definitely unassigned.
+  final List<TreeNode> definitelyUnassignedNodes = [];
+
   /// The assigned variables information that computed for the member.
   AssignedVariablesForTesting<TreeNode, VariableDeclaration> assignedVariables;
 }
diff --git a/pkg/front_end/test/id_tests/definite_unassignment_test.dart b/pkg/front_end/test/id_tests/definite_unassignment_test.dart
new file mode 100644
index 0000000..06b8c7e
--- /dev/null
+++ b/pkg/front_end/test/id_tests/definite_unassignment_test.dart
@@ -0,0 +1,73 @@
+// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io' show Directory, Platform;
+import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
+import 'package:_fe_analyzer_shared/src/testing/id_testing.dart'
+    show DataInterpreter, runTests;
+import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
+import 'package:front_end/src/testing/id_testing_helper.dart';
+import 'package:front_end/src/fasta/builder/member_builder.dart';
+import 'package:front_end/src/fasta/source/source_loader.dart';
+import 'package:front_end/src/fasta/type_inference/type_inference_engine.dart';
+import 'package:front_end/src/testing/id_testing_utils.dart';
+import 'package:kernel/ast.dart' hide Variance;
+
+main(List<String> args) async {
+  Directory dataDir = new Directory.fromUri(Platform.script.resolve(
+      '../../../_fe_analyzer_shared/test/flow_analysis/definite_unassignment/'
+      'data'));
+  await runTests<String>(dataDir,
+      args: args,
+      createUriForFileName: createUriForFileName,
+      onFailure: onFailure,
+      runTest: runTestFor(const DefiniteUnassignmentDataComputer(),
+          [cfeNonNullableOnlyConfig]));
+}
+
+class DefiniteUnassignmentDataComputer extends DataComputer<String> {
+  const DefiniteUnassignmentDataComputer();
+
+  @override
+  DataInterpreter<String> get dataValidator => const StringDataInterpreter();
+
+  /// Function that computes a data mapping for [member].
+  ///
+  /// Fills [actualMap] with the data.
+  void computeMemberData(
+      TestConfig config,
+      InternalCompilerResult compilerResult,
+      Member member,
+      Map<Id, ActualData<String>> actualMap,
+      {bool verbose}) {
+    MemberBuilderImpl memberBuilder =
+        lookupMemberBuilder(compilerResult, member);
+    member.accept(new DefiniteUnassignmentDataExtractor(
+        compilerResult,
+        actualMap,
+        memberBuilder.dataForTesting.inferenceData.flowAnalysisResult));
+  }
+}
+
+class DefiniteUnassignmentDataExtractor extends CfeDataExtractor<String> {
+  final SourceLoaderDataForTesting _sourceLoaderDataForTesting;
+  final FlowAnalysisResult _flowResult;
+
+  DefiniteUnassignmentDataExtractor(InternalCompilerResult compilerResult,
+      Map<Id, ActualData<String>> actualMap, this._flowResult)
+      : _sourceLoaderDataForTesting =
+            compilerResult.kernelTargetForTesting.loader.dataForTesting,
+        super(compilerResult, actualMap);
+
+  @override
+  String computeNodeValue(Id id, TreeNode node) {
+    if (node is VariableGet) {
+      TreeNode alias = _sourceLoaderDataForTesting.toOriginal(node);
+      if (_flowResult.definitelyUnassignedNodes.contains(alias)) {
+        return 'unassigned';
+      }
+    }
+    return null;
+  }
+}
diff --git a/pkg/front_end/test/spell_checking_list_tests.txt b/pkg/front_end/test/spell_checking_list_tests.txt
index 89ce2e9..c043412 100644
--- a/pkg/front_end/test/spell_checking_list_tests.txt
+++ b/pkg/front_end/test/spell_checking_list_tests.txt
@@ -459,6 +459,7 @@
 typeargs
 typeparam
 typeparambounds
+unassignment
 unawaited
 unbreak
 unpacked
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart
new file mode 100644
index 0000000..9a01ce1
--- /dev/null
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart
@@ -0,0 +1,25 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+class Foo<U> {
+  static U foo1() { return null; }
+  static void foo2(U x) { return null; }
+  static void foo3() {
+    U foo4;
+    void foo5(U y) => print(y);
+    U foo6() => null;
+    void Function (U y) foo7 = (U y) => y;
+  }
+  static U Function() foo8() { return null; }
+  static void Function(U) foo9() { return null; }
+  static void foo10(U Function()) { return null; }
+  // old syntax: variable named "U" of a function called 'Function'.
+  static void foo11(void Function(U)) { return null; }
+  static void foo12(void Function(U) b) { return null; }
+  // old syntax: variable named "b" of type "U" of a function called 'Function'.
+  static void foo13(void Function(U b)) { return null; }
+  static U foo14 = null;
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart.outline.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart.outline.expect
new file mode 100644
index 0000000..5db43ea
--- /dev/null
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart.outline.expect
@@ -0,0 +1,64 @@
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:6:12: Error: Can only use type variables in instance methods.
+//   static U foo1() { return null; }
+//            ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:7:15: Error: Can only use type variables in instance methods.
+//   static void foo2(U x) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:14:23: Error: Can only use type variables in instance methods.
+//   static U Function() foo8() { return null; }
+//                       ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:15:27: Error: Can only use type variables in instance methods.
+//   static void Function(U) foo9() { return null; }
+//                           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:16:15: Error: Can only use type variables in instance methods.
+//   static void foo10(U Function()) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:19:15: Error: Can only use type variables in instance methods.
+//   static void foo12(void Function(U) b) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:21:15: Error: Can only use type variables in instance methods.
+//   static void foo13(void Function(U b)) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:22:10: Error: Type variables can't be used in static members.
+//   static U foo14 = null;
+//          ^
+//
+import self as self;
+import "dart:core" as core;
+
+class Foo<U extends core::Object* = dynamic> extends core::Object {
+  static field invalid-type foo14;
+  synthetic constructor •() → self::Foo<self::Foo::U*>*
+    ;
+  static method foo1() → dynamic
+    ;
+  static method foo2(generic-covariant-impl dynamic x) → void
+    ;
+  static method foo3() → void
+    ;
+  static method foo8() → () →* dynamic
+    ;
+  static method foo9() → (dynamic) →* void
+    ;
+  static method foo10(generic-covariant-impl () →* dynamic Function) → void
+    ;
+  static method foo11((dynamic) →* void Function) → void
+    ;
+  static method foo12((dynamic) →* void b) → void
+    ;
+  static method foo13((dynamic) →* void Function) → void
+    ;
+}
+static method main() → dynamic
+  ;
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart.strong.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart.strong.expect
new file mode 100644
index 0000000..966ed95
--- /dev/null
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart.strong.expect
@@ -0,0 +1,122 @@
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:6:12: Error: Can only use type variables in instance methods.
+//   static U foo1() { return null; }
+//            ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:7:15: Error: Can only use type variables in instance methods.
+//   static void foo2(U x) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:14:23: Error: Can only use type variables in instance methods.
+//   static U Function() foo8() { return null; }
+//                       ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:15:27: Error: Can only use type variables in instance methods.
+//   static void Function(U) foo9() { return null; }
+//                           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:16:15: Error: Can only use type variables in instance methods.
+//   static void foo10(U Function()) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:19:15: Error: Can only use type variables in instance methods.
+//   static void foo12(void Function(U) b) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:21:15: Error: Can only use type variables in instance methods.
+//   static void foo13(void Function(U b)) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:22:10: Error: Type variables can't be used in static members.
+//   static U foo14 = null;
+//          ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:7:20: Error: Type variables can't be used in static members.
+//   static void foo2(U x) { return null; }
+//                    ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:9:5: Error: Type variables can't be used in static members.
+//     U foo4;
+//     ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:10:17: Error: Can only use type variables in instance methods.
+//     void foo5(U y) => print(y);
+//                 ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:11:11: Error: Can only use type variables in instance methods.
+//     U foo6() => null;
+//           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:12:20: Error: Type variables can't be used in static members.
+//     void Function (U y) foo7 = (U y) => y;
+//                    ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:12:35: Error: Can only use type variables in instance methods.
+//     void Function (U y) foo7 = (U y) => y;
+//                                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:12:19: Error: Type variables can't be used in static members.
+//     void Function (U y) foo7 = (U y) => y;
+//                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:16:31: Error: Type variables can't be used in static members.
+//   static void foo10(U Function()) { return null; }
+//                               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:19:35: Error: Type variables can't be used in static members.
+//   static void foo12(void Function(U) b) { return null; }
+//                                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:19:34: Error: Type variables can't be used in static members.
+//   static void foo12(void Function(U) b) { return null; }
+//                                  ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:21:34: Error: Type variables can't be used in static members.
+//   static void foo13(void Function(U b)) { return null; }
+//                                  ^
+//
+import self as self;
+import "dart:core" as core;
+
+class Foo<U extends core::Object* = dynamic> extends core::Object {
+  static field invalid-type foo14 = null;
+  synthetic constructor •() → self::Foo<self::Foo::U*>*
+    : super core::Object::•()
+    ;
+  static method foo1() → dynamic {
+    return null;
+  }
+  static method foo2(generic-covariant-impl dynamic x) → void {
+    return null;
+  }
+  static method foo3() → void {
+    invalid-type foo4;
+    function foo5(dynamic y) → void
+      return core::print(y);
+    function foo6() → dynamic
+      return null;
+    (dynamic) →* dynamic foo7 = (dynamic y) → dynamic => y;
+  }
+  static method foo8() → () →* dynamic {
+    return null;
+  }
+  static method foo9() → (dynamic) →* void {
+    return null;
+  }
+  static method foo10(generic-covariant-impl () →* dynamic Function) → void {
+    return null;
+  }
+  static method foo11((dynamic) →* void Function) → void {
+    return null;
+  }
+  static method foo12((dynamic) →* void b) → void {
+    return null;
+  }
+  static method foo13((dynamic) →* void Function) → void {
+    return null;
+  }
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart.strong.transformed.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart.strong.transformed.expect
new file mode 100644
index 0000000..966ed95
--- /dev/null
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart.strong.transformed.expect
@@ -0,0 +1,122 @@
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:6:12: Error: Can only use type variables in instance methods.
+//   static U foo1() { return null; }
+//            ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:7:15: Error: Can only use type variables in instance methods.
+//   static void foo2(U x) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:14:23: Error: Can only use type variables in instance methods.
+//   static U Function() foo8() { return null; }
+//                       ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:15:27: Error: Can only use type variables in instance methods.
+//   static void Function(U) foo9() { return null; }
+//                           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:16:15: Error: Can only use type variables in instance methods.
+//   static void foo10(U Function()) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:19:15: Error: Can only use type variables in instance methods.
+//   static void foo12(void Function(U) b) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:21:15: Error: Can only use type variables in instance methods.
+//   static void foo13(void Function(U b)) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:22:10: Error: Type variables can't be used in static members.
+//   static U foo14 = null;
+//          ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:7:20: Error: Type variables can't be used in static members.
+//   static void foo2(U x) { return null; }
+//                    ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:9:5: Error: Type variables can't be used in static members.
+//     U foo4;
+//     ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:10:17: Error: Can only use type variables in instance methods.
+//     void foo5(U y) => print(y);
+//                 ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:11:11: Error: Can only use type variables in instance methods.
+//     U foo6() => null;
+//           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:12:20: Error: Type variables can't be used in static members.
+//     void Function (U y) foo7 = (U y) => y;
+//                    ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:12:35: Error: Can only use type variables in instance methods.
+//     void Function (U y) foo7 = (U y) => y;
+//                                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:12:19: Error: Type variables can't be used in static members.
+//     void Function (U y) foo7 = (U y) => y;
+//                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:16:31: Error: Type variables can't be used in static members.
+//   static void foo10(U Function()) { return null; }
+//                               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:19:35: Error: Type variables can't be used in static members.
+//   static void foo12(void Function(U) b) { return null; }
+//                                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:19:34: Error: Type variables can't be used in static members.
+//   static void foo12(void Function(U) b) { return null; }
+//                                  ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_class.dart:21:34: Error: Type variables can't be used in static members.
+//   static void foo13(void Function(U b)) { return null; }
+//                                  ^
+//
+import self as self;
+import "dart:core" as core;
+
+class Foo<U extends core::Object* = dynamic> extends core::Object {
+  static field invalid-type foo14 = null;
+  synthetic constructor •() → self::Foo<self::Foo::U*>*
+    : super core::Object::•()
+    ;
+  static method foo1() → dynamic {
+    return null;
+  }
+  static method foo2(generic-covariant-impl dynamic x) → void {
+    return null;
+  }
+  static method foo3() → void {
+    invalid-type foo4;
+    function foo5(dynamic y) → void
+      return core::print(y);
+    function foo6() → dynamic
+      return null;
+    (dynamic) →* dynamic foo7 = (dynamic y) → dynamic => y;
+  }
+  static method foo8() → () →* dynamic {
+    return null;
+  }
+  static method foo9() → (dynamic) →* void {
+    return null;
+  }
+  static method foo10(generic-covariant-impl () →* dynamic Function) → void {
+    return null;
+  }
+  static method foo11((dynamic) →* void Function) → void {
+    return null;
+  }
+  static method foo12((dynamic) →* void b) → void {
+    return null;
+  }
+  static method foo13((dynamic) →* void Function) → void {
+    return null;
+  }
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart
new file mode 100644
index 0000000..7c56bec
--- /dev/null
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart
@@ -0,0 +1,25 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+extension Foo<U> on List {
+  static U foo1() { return null; }
+  static void foo2(U x) { return null; }
+  static void foo3() {
+    U foo4;
+    void foo5(U y) => print(y);
+    U foo6() => null;
+    void Function (U y) foo7 = (U y) => y;
+  }
+  static U Function() foo8() { return null; }
+  static void Function(U) foo9() { return null; }
+  static void foo10(U Function()) { return null; }
+  // old syntax: variable named "U" of a function called 'Function'.
+  static void foo11(void Function(U)) { return null; }
+  static void foo12(void Function(U) b) { return null; }
+  // old syntax: variable named "b" of type "U" of a function called 'Function'.
+  static void foo13(void Function(U b)) { return null; }
+  static U foo14 = null;
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.outline.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.outline.expect
new file mode 100644
index 0000000..ef530f4
--- /dev/null
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.outline.expect
@@ -0,0 +1,72 @@
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:6:12: Error: Can only use type variables in instance methods.
+//   static U foo1() { return null; }
+//            ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:7:15: Error: Can only use type variables in instance methods.
+//   static void foo2(U x) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:14:23: Error: Can only use type variables in instance methods.
+//   static U Function() foo8() { return null; }
+//                       ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:15:27: Error: Can only use type variables in instance methods.
+//   static void Function(U) foo9() { return null; }
+//                           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:16:15: Error: Can only use type variables in instance methods.
+//   static void foo10(U Function()) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:19:15: Error: Can only use type variables in instance methods.
+//   static void foo12(void Function(U) b) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:21:15: Error: Can only use type variables in instance methods.
+//   static void foo13(void Function(U b)) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:22:10: Error: Type variables can't be used in static members.
+//   static U foo14 = null;
+//          ^
+//
+import self as self;
+import "dart:core" as core;
+
+extension Foo<U extends core::Object* = dynamic> on core::List<dynamic>* {
+  static method foo1 = self::Foo|foo1;
+  static method foo2 = self::Foo|foo2;
+  static method foo3 = self::Foo|foo3;
+  static method foo8 = self::Foo|foo8;
+  static method foo9 = self::Foo|foo9;
+  static method foo10 = self::Foo|foo10;
+  static method foo11 = self::Foo|foo11;
+  static method foo12 = self::Foo|foo12;
+  static method foo13 = self::Foo|foo13;
+  static field foo14 = self::Foo|foo14;
+}
+static field invalid-type Foo|foo14;
+static method Foo|foo1() → dynamic
+  ;
+static method Foo|foo2(dynamic x) → void
+  ;
+static method Foo|foo3() → void
+  ;
+static method Foo|foo8() → () →* dynamic
+  ;
+static method Foo|foo9() → (dynamic) →* void
+  ;
+static method Foo|foo10(() →* dynamic Function) → void
+  ;
+static method Foo|foo11((dynamic) →* void Function) → void
+  ;
+static method Foo|foo12((dynamic) →* void b) → void
+  ;
+static method Foo|foo13((dynamic) →* void Function) → void
+  ;
+static method main() → dynamic
+  ;
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.expect
new file mode 100644
index 0000000..e6a1aa9
--- /dev/null
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.expect
@@ -0,0 +1,129 @@
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:6:12: Error: Can only use type variables in instance methods.
+//   static U foo1() { return null; }
+//            ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:7:15: Error: Can only use type variables in instance methods.
+//   static void foo2(U x) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:14:23: Error: Can only use type variables in instance methods.
+//   static U Function() foo8() { return null; }
+//                       ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:15:27: Error: Can only use type variables in instance methods.
+//   static void Function(U) foo9() { return null; }
+//                           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:16:15: Error: Can only use type variables in instance methods.
+//   static void foo10(U Function()) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:19:15: Error: Can only use type variables in instance methods.
+//   static void foo12(void Function(U) b) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:21:15: Error: Can only use type variables in instance methods.
+//   static void foo13(void Function(U b)) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:22:10: Error: Type variables can't be used in static members.
+//   static U foo14 = null;
+//          ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:7:20: Error: Type variables can't be used in static members.
+//   static void foo2(U x) { return null; }
+//                    ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:9:5: Error: Type variables can't be used in static members.
+//     U foo4;
+//     ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:10:17: Error: Can only use type variables in instance methods.
+//     void foo5(U y) => print(y);
+//                 ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:11:11: Error: Can only use type variables in instance methods.
+//     U foo6() => null;
+//           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:12:20: Error: Type variables can't be used in static members.
+//     void Function (U y) foo7 = (U y) => y;
+//                    ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:12:35: Error: Can only use type variables in instance methods.
+//     void Function (U y) foo7 = (U y) => y;
+//                                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:12:19: Error: Type variables can't be used in static members.
+//     void Function (U y) foo7 = (U y) => y;
+//                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:16:31: Error: Type variables can't be used in static members.
+//   static void foo10(U Function()) { return null; }
+//                               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:19:35: Error: Type variables can't be used in static members.
+//   static void foo12(void Function(U) b) { return null; }
+//                                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:19:34: Error: Type variables can't be used in static members.
+//   static void foo12(void Function(U) b) { return null; }
+//                                  ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:21:34: Error: Type variables can't be used in static members.
+//   static void foo13(void Function(U b)) { return null; }
+//                                  ^
+//
+import self as self;
+import "dart:core" as core;
+
+extension Foo<U extends core::Object* = dynamic> on core::List<dynamic>* {
+  static method foo1 = self::Foo|foo1;
+  static method foo2 = self::Foo|foo2;
+  static method foo3 = self::Foo|foo3;
+  static method foo8 = self::Foo|foo8;
+  static method foo9 = self::Foo|foo9;
+  static method foo10 = self::Foo|foo10;
+  static method foo11 = self::Foo|foo11;
+  static method foo12 = self::Foo|foo12;
+  static method foo13 = self::Foo|foo13;
+  static field foo14 = self::Foo|foo14;
+}
+static field invalid-type Foo|foo14 = null;
+static method Foo|foo1() → dynamic {
+  return null;
+}
+static method Foo|foo2(dynamic x) → void {
+  return null;
+}
+static method Foo|foo3() → void {
+  invalid-type foo4;
+  function foo5(dynamic y) → void
+    return core::print(y);
+  function foo6() → dynamic
+    return null;
+  (dynamic) →* dynamic foo7 = (dynamic y) → dynamic => y;
+}
+static method Foo|foo8() → () →* dynamic {
+  return null;
+}
+static method Foo|foo9() → (dynamic) →* void {
+  return null;
+}
+static method Foo|foo10(() →* dynamic Function) → void {
+  return null;
+}
+static method Foo|foo11((dynamic) →* void Function) → void {
+  return null;
+}
+static method Foo|foo12((dynamic) →* void b) → void {
+  return null;
+}
+static method Foo|foo13((dynamic) →* void Function) → void {
+  return null;
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.transformed.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.transformed.expect
new file mode 100644
index 0000000..e6a1aa9
--- /dev/null
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.transformed.expect
@@ -0,0 +1,129 @@
+library;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:6:12: Error: Can only use type variables in instance methods.
+//   static U foo1() { return null; }
+//            ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:7:15: Error: Can only use type variables in instance methods.
+//   static void foo2(U x) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:14:23: Error: Can only use type variables in instance methods.
+//   static U Function() foo8() { return null; }
+//                       ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:15:27: Error: Can only use type variables in instance methods.
+//   static void Function(U) foo9() { return null; }
+//                           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:16:15: Error: Can only use type variables in instance methods.
+//   static void foo10(U Function()) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:19:15: Error: Can only use type variables in instance methods.
+//   static void foo12(void Function(U) b) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:21:15: Error: Can only use type variables in instance methods.
+//   static void foo13(void Function(U b)) { return null; }
+//               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:22:10: Error: Type variables can't be used in static members.
+//   static U foo14 = null;
+//          ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:7:20: Error: Type variables can't be used in static members.
+//   static void foo2(U x) { return null; }
+//                    ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:9:5: Error: Type variables can't be used in static members.
+//     U foo4;
+//     ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:10:17: Error: Can only use type variables in instance methods.
+//     void foo5(U y) => print(y);
+//                 ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:11:11: Error: Can only use type variables in instance methods.
+//     U foo6() => null;
+//           ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:12:20: Error: Type variables can't be used in static members.
+//     void Function (U y) foo7 = (U y) => y;
+//                    ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:12:35: Error: Can only use type variables in instance methods.
+//     void Function (U y) foo7 = (U y) => y;
+//                                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:12:19: Error: Type variables can't be used in static members.
+//     void Function (U y) foo7 = (U y) => y;
+//                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:16:31: Error: Type variables can't be used in static members.
+//   static void foo10(U Function()) { return null; }
+//                               ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:19:35: Error: Type variables can't be used in static members.
+//   static void foo12(void Function(U) b) { return null; }
+//                                   ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:19:34: Error: Type variables can't be used in static members.
+//   static void foo12(void Function(U) b) { return null; }
+//                                  ^
+//
+// pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart:21:34: Error: Type variables can't be used in static members.
+//   static void foo13(void Function(U b)) { return null; }
+//                                  ^
+//
+import self as self;
+import "dart:core" as core;
+
+extension Foo<U extends core::Object* = dynamic> on core::List<dynamic>* {
+  static method foo1 = self::Foo|foo1;
+  static method foo2 = self::Foo|foo2;
+  static method foo3 = self::Foo|foo3;
+  static method foo8 = self::Foo|foo8;
+  static method foo9 = self::Foo|foo9;
+  static method foo10 = self::Foo|foo10;
+  static method foo11 = self::Foo|foo11;
+  static method foo12 = self::Foo|foo12;
+  static method foo13 = self::Foo|foo13;
+  static field foo14 = self::Foo|foo14;
+}
+static field invalid-type Foo|foo14 = null;
+static method Foo|foo1() → dynamic {
+  return null;
+}
+static method Foo|foo2(dynamic x) → void {
+  return null;
+}
+static method Foo|foo3() → void {
+  invalid-type foo4;
+  function foo5(dynamic y) → void
+    return core::print(y);
+  function foo6() → dynamic
+    return null;
+  (dynamic) →* dynamic foo7 = (dynamic y) → dynamic => y;
+}
+static method Foo|foo8() → () →* dynamic {
+  return null;
+}
+static method Foo|foo9() → (dynamic) →* void {
+  return null;
+}
+static method Foo|foo10(() →* dynamic Function) → void {
+  return null;
+}
+static method Foo|foo11((dynamic) →* void Function) → void {
+  return null;
+}
+static method Foo|foo12((dynamic) →* void b) → void {
+  return null;
+}
+static method Foo|foo13((dynamic) →* void Function) → void {
+  return null;
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/text_serialization.status b/pkg/front_end/testcases/text_serialization.status
index 95377bb..78eabf1 100644
--- a/pkg/front_end/testcases/text_serialization.status
+++ b/pkg/front_end/testcases/text_serialization.status
@@ -343,6 +343,8 @@
 general/type_literal_as_metadata: TextSerializationFailure
 general/type_of_null: TextSerializationFailure
 general/type_parameter_type_named_int: TextSerializationFailure
+general/type_parameter_usage_in_static_method_in_class: TextSerializationFailure
+general/type_parameter_usage_in_static_method_in_extension: TextSerializationFailure
 general/type_parameters_on_dynamic: TextSerializationFailure
 general/type_parameters_on_void: TextSerializationFailure
 general/type_variable_as_super: TextSerializationFailure # Was: RuntimeError
diff --git a/pkg/nnbd_migration/lib/instrumentation.dart b/pkg/nnbd_migration/lib/instrumentation.dart
index 820e4bf..51c2c0a 100644
--- a/pkg/nnbd_migration/lib/instrumentation.dart
+++ b/pkg/nnbd_migration/lib/instrumentation.dart
@@ -40,7 +40,7 @@
   @override
   String toString() {
     var pathAsUri = Uri.file(path);
-    return 'unknown ($pathAsUri:$line:$column)';
+    return '${function ?? 'unknown'} ($pathAsUri:$line:$column)';
   }
 }
 
diff --git a/pkg/nnbd_migration/tool/trial_migration.dart b/pkg/nnbd_migration/tool/trial_migration.dart
index 878c024..8731cef 100644
--- a/pkg/nnbd_migration/tool/trial_migration.dart
+++ b/pkg/nnbd_migration/tool/trial_migration.dart
@@ -50,8 +50,10 @@
   var listener = _Listener(categoryOfInterest,
       printExceptionNodeOnly: parsedArgs['exception_node_only'] as bool);
   assert(listener.numExceptions == 0);
+  var overallStartTime = DateTime.now();
   for (var package in packages) {
     print('Migrating $package');
+    var startTime = DateTime.now();
     listener.currentPackage = package.name;
     var contextCollection = AnalysisContextCollectionImpl(
         includedPaths: package.migrationPaths, sdkPath: sdk.sdkPath);
@@ -68,7 +70,7 @@
         if (!resolvedUnit.errors.any((e) => e.severity == Severity.error)) {
           migration.prepareInput(resolvedUnit);
         } else {
-          print('Skipping $file, it has errors.');
+          print('  Skipping $file; it has errors.');
         }
       }
       for (var file in localFiles) {
@@ -86,10 +88,17 @@
       migration.finish();
     }
 
+    var endTime = DateTime.now();
+    print('  Migrated $package in ${endTime.difference(startTime).inSeconds} '
+        'seconds');
     print('  ${files.length} files found');
     var exceptionCount = listener.numExceptions - previousExceptionCount;
     print('  $exceptionCount exceptions in this package');
   }
+
+  var overallDuration = DateTime.now().difference(overallStartTime);
+  print('${packages.length} packages migrated in ${overallDuration.inSeconds} '
+      'seconds');
   print('${listener.numTypesMadeNullable} types made nullable');
   print('${listener.numNullChecksAdded} null checks added');
   print('${listener.numMetaImportsAdded} meta imports added');
@@ -97,18 +106,17 @@
   print('${listener.numDeadCodeSegmentsFound} dead code segments found');
   print('${listener.numExceptions} exceptions in '
       '${listener.groupedExceptions.length} categories');
+
+  var sortedExceptions = [
+    for (var entry in listener.groupedExceptions.entries)
+      ExceptionCategory(entry.key, entry.value)
+  ]..sort((category1, category2) => category2.count.compareTo(category1.count));
+  var exceptionalPackages =
+      sortedExceptions.expand((category) => category.packageNames).toSet();
+  print('Packages with exceptions: $exceptionalPackages');
   print('Exception categories:');
-  var sortedExceptions = listener.groupedExceptions.entries
-      .map((entry) => MapEntry(
-          entry.key,
-          entry.value.entries.toList()
-            ..sort((e1, e2) => e2.value.compareTo(e1.value))))
-      .toList()
-        ..sort((e1, e2) => e2.value.length.compareTo(e1.value.length));
-  for (var entry in sortedExceptions) {
-    final packages =
-        entry.value.map((entry) => "${entry.key} x${entry.value}").join(', ');
-    print('  ${entry.key} ($packages)');
+  for (var category in sortedExceptions) {
+    print('  $category');
   }
 
   if (categoryOfInterest == null) {
@@ -117,6 +125,25 @@
   }
 }
 
+class ExceptionCategory {
+  final String topOfStack;
+  final List<MapEntry<String, int>> exceptionCountPerPackage;
+
+  ExceptionCategory(this.topOfStack, Map<String, int> exceptions)
+      : this.exceptionCountPerPackage = exceptions.entries.toList()
+          ..sort((e1, e2) => e2.value.compareTo(e1.value));
+
+  int get count => exceptionCountPerPackage.length;
+
+  List<String> get packageNames =>
+      [for (var entry in exceptionCountPerPackage) entry.key];
+
+  Iterable<String> get packageNamesAndCounts =>
+      exceptionCountPerPackage.map((entry) => '${entry.key} x${entry.value}');
+
+  String toString() => '$topOfStack (${packageNamesAndCounts.join(', ')})';
+}
+
 ArgResults parseArguments(List<String> args) {
   ArgParser argParser = ArgParser();
   ArgResults parsedArgs;
diff --git a/pkg/nnbd_migration/tool/trial_migration_p2.sh b/pkg/nnbd_migration/tool/trial_migration_p2.sh
index 63fee78..bca1231 100755
--- a/pkg/nnbd_migration/tool/trial_migration_p2.sh
+++ b/pkg/nnbd_migration/tool/trial_migration_p2.sh
@@ -126,7 +126,7 @@
   echo "-g https://github.com/google/pageloader.git" # This is pageloader3.
   echo "-g https://github.com/sass/dart-sass.git"
   echo "-g https://dart.googlesource.com/shelf_packages_handler.git"
-  echo "-g https://github.com/dart-lang/source_gen.git"
+  # TODO(srawlins): Add source_gen.
   echo "-g https://dart.googlesource.com/source_map_stack_trace.git"
 }
 
diff --git a/pkg/test_runner/lib/src/browser.dart b/pkg/test_runner/lib/src/browser.dart
index 0f6a1f3..60d3a92 100644
--- a/pkg/test_runner/lib/src/browser.dart
+++ b/pkg/test_runner/lib/src/browser.dart
@@ -218,32 +218,17 @@
     return lines.join("\\n");
   };
 
-  let pendingCallbacks = 0;
-  let waitForDone = false, isDone = false;
-
   sdk.dart.addAsyncCallback = function() {
-    pendingCallbacks++;
-    if (!waitForDone) {
-      // When the first callback is added, signal that test_controller.js
-      // should wait until done.
-      waitForDone = true;
-      dartPrint('unittest-suite-wait-for-done');
-    }
+    async_helper.async_helper.asyncStart();
   };
 
   sdk.dart.removeAsyncCallback = function() {
-    if (--pendingCallbacks <= 0) {
-      // We might be done with async callbacks. Schedule a task to check.
-      // Note: can't use a Promise here, because the unhandled rejection event
-      // is fired as a task, rather than a microtask. `setTimeout` will create a
-      // task, giving an unhandled promise reject time to fire before this does.
-      setTimeout(() => {
-        if (pendingCallbacks <= 0 && !isDone) {
-          isDone = true;
-          dartPrint('unittest-suite-done');
-        }
-      }, 0);
-    }
+    // removeAsyncCallback() is called *before* the async operation is
+    // performed, but we don't want to report the test as being done until
+    // after that operation completes, so wait for that callback to run.
+    setTimeout(() => {
+      async_helper.async_helper.asyncEnd();
+    }, 0);
   };
 
   if ($isNnbd) {
diff --git a/pkg/test_runner/lib/src/browser_controller.dart b/pkg/test_runner/lib/src/browser_controller.dart
index 594cdf9..f2804c5 100644
--- a/pkg/test_runner/lib/src/browser_controller.dart
+++ b/pkg/test_runner/lib/src/browser_controller.dart
@@ -1120,10 +1120,7 @@
 
     DebugLogger.warning("Double reporting tests:");
     for (var id in doubleReportingOutputs.keys) {
-      DebugLogger.warning("${testCache[id]}, output: ");
-      DebugLogger.warning("${doubleReportingOutputs[id]}");
-      DebugLogger.warning("");
-      DebugLogger.warning("");
+      DebugLogger.warning("${testCache[id]}");
     }
   }
 
diff --git a/pkg/test_runner/lib/src/test_controller.js b/pkg/test_runner/lib/src/test_controller.js
index 9abf450..05f7882 100644
--- a/pkg/test_runner/lib/src/test_controller.js
+++ b/pkg/test_runner/lib/src/test_controller.js
@@ -86,6 +86,11 @@
 var testExpectsGlobalError = false;
 var testSuppressedGlobalErrors = [];
 
+// If the global error handler has been called, then the test has been reported
+// done already. There may still be pending asynchronous operations. When those
+// finish, don't re-report the test as now passing.
+var hadTopLevelError = false;
+
 // Set window onerror to make sure that we catch test harness errors across all
 // browsers.
 window.onerror = function (message, url, lineNumber) {
@@ -99,6 +104,7 @@
     });
     return;
   }
+  hadTopLevelError = true
   recordEvent('window_onerror', message);
   notifyDone('FAIL');
 };
@@ -110,6 +116,7 @@
     testSuppressedGlobalErrors.push({message: message});
     return;
   }
+  hadTopLevelError = true
   recordEvent('window_onerror', message);
   notifyDone('FAIL');
 };
@@ -169,6 +176,12 @@
 }
 
 function notifyUpdate(testOutcome, isFirstMessage, isStatusUpdate, isDone) {
+  // If the test was reporting as failed because of a top-level error, then
+  // there may be other pending asynchronous operations, and the test framework
+  // does not know that error happened. When those operations later complete,
+  // it incorrectly double-reports the test as passing. Silence that.
+  if (hadTopLevelError && testOutcome == 'PASS') return;
+
   // If we are not using the browser controller (e.g. in the none-drt
   // configuration), we need to print 'testOutcome' as it is.
   if (isDone && !usingBrowserController()) {
@@ -291,7 +304,6 @@
     // We have to do this asynchronously, in case error messages are
     // already in the message queue.
     window.postMessage(message, '*');
-    return;
   }
 }
 
diff --git a/pkg/vm/lib/metadata/unboxing_info.dart b/pkg/vm/lib/metadata/unboxing_info.dart
index 3824ca7..289819b 100644
--- a/pkg/vm/lib/metadata/unboxing_info.dart
+++ b/pkg/vm/lib/metadata/unboxing_info.dart
@@ -27,6 +27,19 @@
             growable: true),
         returnInfo = source.readByte();
 
+  // Returns `true` if all arguments as well as the return value have to be
+  // boxed.
+  //
+  // We don't have to write out metadata for fully boxed methods, because this
+  // is the default.
+  bool get isFullyBoxed {
+    if (returnInfo != kBoxed) return false;
+    for (int argInfo in unboxedArgsInfo) {
+      if (argInfo != kBoxed) return false;
+    }
+    return true;
+  }
+
   void writeToBinary(BinarySink sink) {
     sink.writeUInt30(unboxedArgsInfo.length);
     for (int val in unboxedArgsInfo) {
@@ -34,6 +47,33 @@
     }
     sink.writeByte(returnInfo);
   }
+
+  @override
+  String toString() {
+    final sb = StringBuffer();
+    sb.write('(');
+    for (int i = 0; i < unboxedArgsInfo.length; ++i) {
+      final argInfo = unboxedArgsInfo[i];
+      sb.write(_stringifyUnboxingInfo(argInfo));
+      if (i != (unboxedArgsInfo.length - 1)) {
+        sb.write(',');
+      }
+    }
+    sb.write(')');
+    sb.write('->');
+    sb.write(_stringifyUnboxingInfo(returnInfo));
+    return sb.toString();
+  }
+
+  static String _stringifyUnboxingInfo(int info) {
+    if (info == UnboxingInfoMetadata.kUnboxedIntCandidate) {
+      return 'i';
+    } else if (info == UnboxingInfoMetadata.kUnboxedDoubleCandidate) {
+      return 'd';
+    }
+    assert(info == 0);
+    return 'b';
+  }
 }
 
 class UnboxingInfoMetadataRepository
diff --git a/pkg/vm/lib/transformations/type_flow/transformer.dart b/pkg/vm/lib/transformations/type_flow/transformer.dart
index 12a97c8..21f0456 100644
--- a/pkg/vm/lib/transformations/type_flow/transformer.dart
+++ b/pkg/vm/lib/transformations/type_flow/transformer.dart
@@ -315,8 +315,8 @@
 
         final unboxingInfoMetadata =
             _unboxingInfo.getUnboxingInfoOfMember(member);
-
-        if (unboxingInfoMetadata != null) {
+        if (unboxingInfoMetadata != null &&
+            !unboxingInfoMetadata.isFullyBoxed) {
           _unboxingInfoMetadata.mapping[member] = unboxingInfoMetadata;
         }
 
@@ -340,7 +340,9 @@
                 UnboxingInfoMetadata.kBoxed;
           }
         }
-        _unboxingInfoMetadata.mapping[member] = unboxingInfoMetadata;
+        if (!unboxingInfoMetadata.isFullyBoxed) {
+          _unboxingInfoMetadata.mapping[member] = unboxingInfoMetadata;
+        }
       }
     }
 
diff --git a/pkg/vm/lib/transformations/unreachable_code_elimination.dart b/pkg/vm/lib/transformations/unreachable_code_elimination.dart
index 6770707..22fdbc1 100644
--- a/pkg/vm/lib/transformations/unreachable_code_elimination.dart
+++ b/pkg/vm/lib/transformations/unreachable_code_elimination.dart
@@ -136,6 +136,37 @@
     return super.visitAssertInitializer(node);
   }
 
+  @override
+  TreeNode visitTryFinally(TryFinally node) {
+    node.transformChildren(this);
+    final fin = node.finalizer;
+    if (fin == null || (fin is Block && fin.statements.isEmpty)) {
+      return node.body;
+    }
+    return node;
+  }
+
+  bool _isRethrow(Statement body) {
+    if (body is ExpressionStatement && body.expression is Rethrow) {
+      return true;
+    } else if (body is Block && body.statements.length == 1) {
+      return _isRethrow(body.statements.single);
+    }
+    return false;
+  }
+
+  @override
+  TreeNode visitTryCatch(TryCatch node) {
+    node.transformChildren(this);
+    // Can replace try/catch with its body if all catches are just rethow.
+    for (Catch catchClause in node.catches) {
+      if (!_isRethrow(catchClause.body)) {
+        return node;
+      }
+    }
+    return node.body;
+  }
+
   // Make sure we're not generating `null` bodies.
   // Try/catch, try/finally and switch/case statements
   // always have a Block in a body, so there is no
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/abstract_class_entry_point.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/abstract_class_entry_point.dart.expect
index cbf2f0b..3864b4c 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/abstract_class_entry_point.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/abstract_class_entry_point.dart.expect
@@ -5,4 +5,4 @@
 @#C3
 abstract class AbstractEmptyClass extends core::Object {
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → dynamic {}
+static method main() → dynamic {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/annotation.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/annotation.dart.expect
index fb1f6ec..19cfe54 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/annotation.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/annotation.dart.expect
@@ -18,21 +18,21 @@
 [@vm.unreachable.metadata=] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  final field self::ParametrizedAnnotation::T* foo;
 }
 abstract class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  static method staticMethod() → void {}
+  static method staticMethod() → void {}
 }
 @#C6
 class B extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  @#C8
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  @#C8
   method instanceMethod() → void {}
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (core::List<core::int*>*) →* void a) → core::int* {
+[@vm.unboxing-info.metadata=(b)->i]static method foo([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (core::List<core::int*>*) →* void a) → core::int* {
   @#C9 core::int* x = 2;
   return [@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] x.{core::num::+}(2);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']@#C11
+@#C11
 static method main(core::List<core::String*>* args) → dynamic {
   self::A::staticMethod();
   [@vm.direct-call.metadata=#lib::B::instanceMethod] [@vm.inferred-type.metadata=!? (skip check)] new self::B::•().{self::B::instanceMethod}();
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/bench_is_prime.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/bench_is_prime.dart.expect
index 052f360..cc7e808 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/bench_is_prime.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/bench_is_prime.dart.expect
@@ -3,7 +3,7 @@
 import "dart:core" as core;
 import "dart:_internal" as _in;
 
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method isPrime([@vm.inferred-type.metadata=int] dynamic n) → core::bool* {
+[@vm.unboxing-info.metadata=(i)->b]static method isPrime([@vm.inferred-type.metadata=int] dynamic n) → core::bool* {
   if(_in::unsafeCast<core::bool*>([@vm.direct-call.metadata=dart.core::_IntegerImplementation::<] [@vm.inferred-type.metadata=dart.core::bool] n.<(2)))
     return false;
   for (core::int* i = 2; [@vm.direct-call.metadata=dart.core::_IntegerImplementation::<=] [@vm.inferred-type.metadata=dart.core::bool (skip check)] [@vm.direct-call.metadata=dart.core::_IntegerImplementation::*] [@vm.inferred-type.metadata=int (skip check)] i.{core::num::*}(i).{core::num::<=}(_in::unsafeCast<core::num*>(n)); i = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] i.{core::num::+}(1)) {
@@ -12,7 +12,7 @@
   }
   return true;
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method nThPrimeNumber([@vm.inferred-type.metadata=dart.core::_Smi (value: 50000)] core::int* n) → core::int* {
+[@vm.unboxing-info.metadata=(i)->b]static method nThPrimeNumber([@vm.inferred-type.metadata=dart.core::_Smi (value: 50000)] core::int* n) → core::int* {
   core::int* counter = 0;
   for (core::int* i = 1; ; i = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::+??] [@vm.inferred-type.metadata=int (skip check)] i.{core::num::+}(1)) {
     if([@vm.inferred-type.metadata=dart.core::bool] self::isPrime(i))
@@ -22,14 +22,14 @@
     }
   }
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method run() → void {
+static method run() → void {
   core::int* e = 611953;
   core::int* p = [@vm.inferred-type.metadata=int?] self::nThPrimeNumber(50000);
   if(![@vm.inferred-type.metadata=dart.core::bool] p.{core::num::==}(e)) {
     throw core::Exception::•("Unexpected result: ${p} != ${e}");
   }
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   core::Stopwatch* timer = let final core::Stopwatch* #t1 = new core::Stopwatch::•() in let final void #t2 = [@vm.direct-call.metadata=dart.core::Stopwatch::start] [@vm.inferred-type.metadata=!? (skip check)] #t1.{core::Stopwatch::start}() in #t1;
   for (core::int* i = 0; [@vm.direct-call.metadata=dart.core::_IntegerImplementation::<] [@vm.inferred-type.metadata=dart.core::bool (skip check)] i.{core::num::<}(100); i = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] i.{core::num::+}(1)) {
     self::run();
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/bench_vector.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/bench_vector.dart.expect
index 68decfe..509b16a 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/bench_vector.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/bench_vector.dart.expect
@@ -9,15 +9,15 @@
 [@vm.inferred-type.metadata=dart.core::_Smi (value: 0)] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:4,getterSelectorId:5]  final field core::int* _offset;
 [@vm.inferred-type.metadata=dart.core::_Smi (value: 10)] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7]  final field core::int* _length;
 [@vm.inferred-type.metadata=dart.typed_data::_Float64List] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:8,getterSelectorId:9]  final field core::List<core::double*>* _elements;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  constructor •([@vm.inferred-type.metadata=dart.core::_Smi (value: 10)] core::int* size) → self::_Vector*
+[@vm.unboxing-info.metadata=(i)->b]  constructor •([@vm.inferred-type.metadata=dart.core::_Smi (value: 10)] core::int* size) → self::_Vector*
     : self::_Vector::_offset = 0, self::_Vector::_length = size, self::_Vector::_elements = [@vm.inferred-type.metadata=dart.typed_data::_Float64List] typ::Float64List::•(size), super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:1] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  operator []([@vm.inferred-type.metadata=!] core::int* i) → core::double*
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:1] [@vm.unboxing-info.metadata=(b)->d]  operator []([@vm.inferred-type.metadata=!] core::int* i) → core::double*
     return [@vm.direct-call.metadata=dart.typed_data::_Float64List::[]] [@vm.inferred-type.metadata=dart.core::_Double (skip check)] [@vm.direct-call.metadata=#lib::_Vector::_elements] [@vm.inferred-type.metadata=dart.typed_data::_Float64List] this.{self::_Vector::_elements}.{core::List::[]}([@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] i.{core::num::+}([@vm.direct-call.metadata=#lib::_Vector::_offset] [@vm.inferred-type.metadata=dart.core::_Smi (value: 0)] this.{self::_Vector::_offset}));
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  operator []=([@vm.inferred-type.metadata=dart.core::_OneByteString] core::int* i, core::double* value) → void {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:2]  operator []=([@vm.inferred-type.metadata=dart.core::_OneByteString] core::int* i, core::double* value) → void {
     let dynamic #t1 = [@vm.direct-call.metadata=#lib::_Vector::_elements] [@vm.inferred-type.metadata=dart.typed_data::_Float64List] this.{self::_Vector::_elements} in let dynamic #t2 = i in let dynamic #t3 = [@vm.direct-call.metadata=#lib::_Vector::_offset] [@vm.inferred-type.metadata=dart.core::_Smi (value: 0)] this.{self::_Vector::_offset} in throw "Attempt to execute code removed by Dart AOT compiler (TFA)";
   }
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  operator *([@vm.inferred-type.metadata=#lib::_Vector?] self::_Vector* a) → core::double* {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3] [@vm.unboxing-info.metadata=(b)->d]  operator *([@vm.inferred-type.metadata=#lib::_Vector?] self::_Vector* a) → core::double* {
     core::double* result = 0.0;
     for (core::int* i = 0; [@vm.direct-call.metadata=dart.core::_IntegerImplementation::<] [@vm.inferred-type.metadata=dart.core::bool (skip check)] i.{core::num::<}([@vm.direct-call.metadata=#lib::_Vector::_length] [@vm.inferred-type.metadata=dart.core::_Smi (value: 10)] this.{self::_Vector::_length}); i = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] i.{core::num::+}(1))
       result = [@vm.direct-call.metadata=dart.core::_Double::+??] [@vm.inferred-type.metadata=dart.core::_Double (skip check)] result.{core::double::+}([@vm.direct-call.metadata=dart.core::_Double::*] [@vm.inferred-type.metadata=dart.core::_Double (skip check)] [@vm.direct-call.metadata=#lib::_Vector::[]] [@vm.inferred-type.metadata=dart.core::_Double (skip check)] this.{self::_Vector::[]}(i).{core::double::*}([@vm.direct-call.metadata=#lib::_Vector::[]??] [@vm.inferred-type.metadata=dart.core::_Double (skip check)] a.{self::_Vector::[]}(i)));
@@ -26,7 +26,7 @@
 }
 [@vm.inferred-type.metadata=#lib::_Vector?]static field self::_Vector* v = new self::_Vector::•(10);
 [@vm.inferred-type.metadata=dart.core::_Double?]static field core::double* x = 0.0;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   core::Stopwatch* timer = let final core::Stopwatch* #t4 = new core::Stopwatch::•() in let final void #t5 = [@vm.direct-call.metadata=dart.core::Stopwatch::start] [@vm.inferred-type.metadata=!? (skip check)] #t4.{core::Stopwatch::start}() in #t4;
   for (core::int* i = 0; [@vm.direct-call.metadata=dart.core::_IntegerImplementation::<] [@vm.inferred-type.metadata=dart.core::bool (skip check)] i.{core::num::<}(100000000); i = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] i.{core::num::+}(1)) {
     self::x = [@vm.direct-call.metadata=dart.core::_Double::+??] [@vm.inferred-type.metadata=dart.core::_Double (skip check)] [@vm.inferred-type.metadata=dart.core::_Double?] self::x.{core::double::+}([@vm.direct-call.metadata=#lib::_Vector::*??] [@vm.inferred-type.metadata=dart.core::_Double (skip check)] [@vm.inferred-type.metadata=#lib::_Vector?] self::v.{self::_Vector::*}([@vm.inferred-type.metadata=#lib::_Vector?] self::v));
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/class_generics_basic.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/class_generics_basic.dart.expect
index 6140efa..fd9dd20 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/class_generics_basic.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/class_generics_basic.dart.expect
@@ -3,44 +3,44 @@
 import "dart:core" as core;
 
 class C<T extends core::Object* = dynamic> extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::C<self::C::T*>*
+  synthetic constructor •() → self::C<self::C::T*>*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → dynamic
     return new self::D::•<self::C::T*>();
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method id1([@vm.inferred-type.metadata=#lib::Y (skip check)] generic-covariant-impl self::C::T* x) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method id1([@vm.inferred-type.metadata=#lib::Y (skip check)] generic-covariant-impl self::C::T* x) → dynamic
     return x;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method id2([@vm.inferred-type.metadata=#lib::Z] generic-covariant-impl self::C::T* x) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method id2([@vm.inferred-type.metadata=#lib::Z] generic-covariant-impl self::C::T* x) → dynamic
     return x;
 }
 class D<T extends core::Object* = dynamic> extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::D<self::D::T*>*
+  synthetic constructor •() → self::D<self::D::T*>*
     : super core::Object::•()
     ;
 }
 class E<S extends core::Object* = dynamic, T extends core::Object* = dynamic> extends self::C<self::E::T*> {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::E<self::E::S*, self::E::T*>*
+  synthetic constructor •() → self::E<self::E::S*, self::E::T*>*
     : super self::C::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → dynamic
     return [@vm.inferred-type.metadata=#lib::D<dart.core::String*>] super.{self::C::foo}();
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method bar() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  method bar() → dynamic
     return new self::D::•<self::E::S*>();
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method baz() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method baz() → dynamic
     return new self::D::•<self::E::T*>();
 }
 abstract class X extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::X*
+  synthetic constructor •() → self::X*
     : super core::Object::•()
     ;
 }
 class Y extends self::X {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::Y*
+  synthetic constructor •() → self::Y*
     : super self::X::•()
     ;
 }
 class Z extends self::X {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::Z*
+  synthetic constructor •() → self::Z*
     : super self::X::•()
     ;
 }
@@ -49,20 +49,20 @@
 abstract class J extends self::I<core::int*> {
 }
 class K<T extends core::Object* = dynamic> extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::K<self::K::T*>*
+  synthetic constructor •() → self::K<self::K::T*>*
     : super core::Object::•()
     ;
 }
 class C2<T extends core::Object* = dynamic> extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::C2<self::C2::T*>*
+  synthetic constructor •() → self::C2<self::C2::T*>*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method id3([@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.0)] generic-covariant-impl core::Comparable<self::C2::T*>* x) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method id3([@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.0)] generic-covariant-impl core::Comparable<self::C2::T*>* x) → dynamic
     return x;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method id4([@vm.inferred-type.metadata=#lib::K<#lib::J*> (skip check)] generic-covariant-impl self::K<self::I<self::C2::T*>*>* x) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  method id4([@vm.inferred-type.metadata=#lib::K<#lib::J*> (skip check)] generic-covariant-impl self::K<self::I<self::C2::T*>*>* x) → dynamic
     return x;
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → dynamic {
+static method main() → dynamic {
   core::print([@vm.direct-call.metadata=#lib::C::foo] [@vm.inferred-type.metadata=#lib::D<dart.core::int*> (skip check)] new self::C::•<core::int*>().{self::C::foo}());
   core::print([@vm.direct-call.metadata=#lib::E::foo] [@vm.inferred-type.metadata=#lib::D<dart.core::String*> (skip check)] new self::E::•<core::int*, core::String*>().{self::E::foo}());
   core::print([@vm.direct-call.metadata=#lib::E::bar] [@vm.inferred-type.metadata=#lib::D<dart.core::int*> (skip check)] new self::E::•<core::int*, core::String*>().{self::E::bar}());
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/class_generics_case1.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/class_generics_case1.dart.expect
index f919630..8c4940c 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/class_generics_case1.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/class_generics_case1.dart.expect
@@ -5,20 +5,20 @@
 import "dart:collection";
 
 class Element extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::Element*
+  synthetic constructor •() → self::Element*
     : super core::Object::•()
     ;
 }
 class InheritedElement extends self::Element {
 [@vm.inferred-type.metadata=dart.collection::_InternalLinkedHashMap<#lib::Element*, dart.core::Object*>] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  final field core::Map<self::Element*, core::Object*>* _dependents = <self::Element*, core::Object*>{};
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::InheritedElement*
+  synthetic constructor •() → self::InheritedElement*
     : super self::Element::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method setDependencies([@vm.inferred-type.metadata=!] self::Element* dependent, [@vm.inferred-type.metadata=dart.core::_Smi?] core::Object* value) → void {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method setDependencies([@vm.inferred-type.metadata=!] self::Element* dependent, [@vm.inferred-type.metadata=dart.core::_Smi?] core::Object* value) → void {
     [@vm.call-site-attributes.metadata=receiverType:dart.core::Map<#lib::Element*, dart.core::Object*>*] [@vm.direct-call.metadata=dart.collection::__InternalLinkedHashMap&_HashVMBase&MapMixin&_LinkedHashMapMixin::[]=] [@vm.inferred-type.metadata=!? (skip check)] [@vm.direct-call.metadata=#lib::InheritedElement::_dependents] [@vm.inferred-type.metadata=dart.collection::_InternalLinkedHashMap<#lib::Element*, dart.core::Object*>] this.{self::InheritedElement::_dependents}.{core::Map::[]=}(dependent, value);
   }
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → dynamic {
+static method main() → dynamic {
   self::InheritedElement* ie = new self::InheritedElement::•();
   [@vm.direct-call.metadata=#lib::InheritedElement::setDependencies] [@vm.inferred-type.metadata=!? (skip check)] ie.{self::InheritedElement::setDependencies}(ie, 0);
   [@vm.direct-call.metadata=#lib::InheritedElement::setDependencies] [@vm.inferred-type.metadata=!? (skip check)] ie.{self::InheritedElement::setDependencies}(new self::Element::•(), null);
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/const_prop.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/const_prop.dart.expect
index e0f5062..5ad5c41 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/const_prop.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/const_prop.dart.expect
@@ -3,53 +3,53 @@
 import "dart:core" as core;
 
 class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,getterSelectorId:1]  get foo() → core::String*
     return "foo";
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:2,getterSelectorId:3] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method getBar() → core::String*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:2,getterSelectorId:3]  method getBar() → core::String*
     return "bar";
 }
 class B extends core::Object /*isEnum*/  {
 [@vm.inferred-type.metadata=dart.core::_Smi (value: 1)] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7]  final field core::int* index;
 [@vm.inferred-type.metadata=dart.core::_OneByteString (value: B.b2)] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:8,getterSelectorId:9]  final field core::String* _name;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:4,getterSelectorId:5] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method toString() → core::String*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:4,getterSelectorId:5]  method toString() → core::String*
     return [@vm.inferred-type.metadata=dart.core::_OneByteString (value: B.b2)] this.{=self::B::_name};
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method test0([@vm.inferred-type.metadata=dart.core::_Smi (value: 40)] core::int* arg) → void {
+[@vm.unboxing-info.metadata=(i)->b]static method test0([@vm.inferred-type.metadata=dart.core::_Smi (value: 40)] core::int* arg) → void {
   core::print(arg);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method test1([[@vm.inferred-type.metadata=dart.core::_Smi (value: 42)] core::int* arg = #C1]) → void {
+static method test1([[@vm.inferred-type.metadata=dart.core::_Smi (value: 42)] core::int* arg = #C1]) → void {
   core::print(arg);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method test2({[@vm.inferred-type.metadata=dart.core::_Smi (value: 43)] core::int* arg = #C2}) → void {
+static method test2({[@vm.inferred-type.metadata=dart.core::_Smi (value: 43)] core::int* arg = #C2}) → void {
   core::print(arg);
 }
 static get getD() → dynamic
   return 100.0;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method testDouble([@vm.inferred-type.metadata=dart.core::_Double (value: 3.14)] core::double* arg) → void {
+[@vm.unboxing-info.metadata=(d)->b]static method testDouble([@vm.inferred-type.metadata=dart.core::_Double (value: 3.14)] core::double* arg) → void {
   core::print(arg);
   core::print([@vm.inferred-type.metadata=dart.core::_Double (value: 100.0)] self::getD);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method testStrings([@vm.inferred-type.metadata=#lib::A] self::A* a0, [@vm.inferred-type.metadata=dart.core::_OneByteString (value: bazz)] core::String* a1) → void {
+static method testStrings([@vm.inferred-type.metadata=#lib::A] self::A* a0, [@vm.inferred-type.metadata=dart.core::_OneByteString (value: bazz)] core::String* a1) → void {
   core::print([@vm.direct-call.metadata=#lib::A::foo] [@vm.inferred-type.metadata=dart.core::_OneByteString (value: foo)] a0.{self::A::foo});
   core::print([@vm.direct-call.metadata=#lib::A::getBar] [@vm.inferred-type.metadata=dart.core::_OneByteString (skip check) (value: bar)] a0.{self::A::getBar}());
   core::print(a1);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method testPassEnum([@vm.inferred-type.metadata=#lib::B (value: #lib::B {index: 1, #lib::_name: B.b2, })] self::B* arg) → void {
+static method testPassEnum([@vm.inferred-type.metadata=#lib::B (value: #lib::B {index: 1, #lib::_name: B.b2, })] self::B* arg) → void {
   self::testPassEnum2(arg);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method testPassEnum2([@vm.inferred-type.metadata=#lib::B (value: #lib::B {index: 1, #lib::_name: B.b2, })] self::B* arg) → void {
+static method testPassEnum2([@vm.inferred-type.metadata=#lib::B (value: #lib::B {index: 1, #lib::_name: B.b2, })] self::B* arg) → void {
   core::print(arg);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getList() → dynamic
+static method getList() → dynamic
   return #C6;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method testList([@vm.inferred-type.metadata=dart.core::_ImmutableList (value: ListConstant<dart.core::int*>([1, 2, 3]))] dynamic arg1, [[@vm.inferred-type.metadata=dart.core::_ImmutableList (value: ListConstant<dart.core::int*>([4, 5]))] dynamic arg2 = #C9]) → void {
+static method testList([@vm.inferred-type.metadata=dart.core::_ImmutableList (value: ListConstant<dart.core::int*>([1, 2, 3]))] dynamic arg1, [[@vm.inferred-type.metadata=dart.core::_ImmutableList (value: ListConstant<dart.core::int*>([4, 5]))] dynamic arg2 = #C9]) → void {
   core::print(arg1);
   core::print(arg2);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → dynamic {
+static method main() → dynamic {
   self::test0(40);
   self::test1();
   self::test2();
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/devirt.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/devirt.dart.expect
index 087a1100..1469023 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/devirt.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/devirt.dart.expect
@@ -3,58 +3,58 @@
 import "dart:core" as core;
 
 abstract class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foo() → core::int*;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foo() → core::int*;
 }
 class B extends self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super self::A::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → core::int*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → core::int*
     return 1;
 }
 class C extends core::Object implements self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::C*
+  synthetic constructor •() → self::C*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → core::int*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → core::int*
     return 2;
 }
 class D extends self::C {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::D*
+  synthetic constructor •() → self::D*
     : super self::C::•()
     ;
 }
 class E extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::E*
+  synthetic constructor •() → self::E*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method toString() → core::String*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method toString() → core::String*
     return "D";
 }
 [@vm.inferred-type.metadata=#lib::D?]static field self::A* dd;
 [@vm.inferred-type.metadata=#lib::E?]static field self::E* ee = new self::E::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method callerA1([@vm.inferred-type.metadata=!] self::A* aa) → void {
+static method callerA1([@vm.inferred-type.metadata=!] self::A* aa) → void {
   [@vm.inferred-type.metadata=!? (skip check)] aa.{self::A::foo}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method callerA2([@vm.inferred-type.metadata=#lib::B] self::A* aa) → void {
+static method callerA2([@vm.inferred-type.metadata=#lib::B] self::A* aa) → void {
   [@vm.direct-call.metadata=#lib::B::foo] [@vm.inferred-type.metadata=!? (skip check)] aa.{self::A::foo}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method callerA3({[@vm.inferred-type.metadata=#lib::C] self::A* aa = #C1}) → void {
+static method callerA3({[@vm.inferred-type.metadata=#lib::C] self::A* aa = #C1}) → void {
   [@vm.direct-call.metadata=#lib::C::foo] [@vm.inferred-type.metadata=!? (skip check)] aa.{self::A::foo}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method callerA4([@vm.inferred-type.metadata=#lib::D?] self::A* aa) → void {
+static method callerA4([@vm.inferred-type.metadata=#lib::D?] self::A* aa) → void {
   [@vm.direct-call.metadata=#lib::C::foo??] [@vm.inferred-type.metadata=!? (skip check)] aa.{self::A::foo}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method callerE1([@vm.inferred-type.metadata=dart.core::_OneByteString (value: abc)] dynamic x) → void {
+static method callerE1([@vm.inferred-type.metadata=dart.core::_OneByteString (value: abc)] dynamic x) → void {
   [@vm.direct-call.metadata=dart.core::_StringBase::toString] [@vm.inferred-type.metadata=!? (skip check) (receiver not int)] x.{core::Object::toString}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method callerE2([@vm.inferred-type.metadata=#lib::E?] dynamic x) → void {
+static method callerE2([@vm.inferred-type.metadata=#lib::E?] dynamic x) → void {
   [@vm.inferred-type.metadata=!? (receiver not int)] x.{core::Object::toString}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   self::callerA1(new self::B::•());
   self::callerA1(new self::C::•());
   self::callerA2(new self::B::•());
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/dynamic_list_access.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/dynamic_list_access.dart.expect
index fbd47a2..2f98a40 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/dynamic_list_access.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/dynamic_list_access.dart.expect
@@ -2,7 +2,7 @@
 import self as self;
 import "dart:core" as core;
 
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → dynamic {
+static method main() → dynamic {
   dynamic x = [@vm.inferred-type.metadata=dart.core::_List<dart.core::int*>] core::_List::•<core::int*>(10);
   [@vm.direct-call.metadata=dart.core::_IntegerImplementation::+??] [@vm.direct-call.metadata=dart.core::_List::[]] [@vm.inferred-type.metadata=int? (receiver not int)] x.[](0).+(10);
 }
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/future.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/future.dart.expect
index 0714c99..be83db0 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/future.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/future.dart.expect
@@ -6,21 +6,21 @@
 import "dart:async";
 
 class C<T extends core::Object* = dynamic> extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::C<self::C::T*>*
+  synthetic constructor •() → self::C<self::C::T*>*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test2c([@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 3)] generic-covariant-impl asy::FutureOr<self::C::T*>* x) → void {}
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test3c([@vm.inferred-type.metadata=dart.async::_Future<dart.core::int*> (skip check)] generic-covariant-impl asy::Future<self::C::T*>* x) → void {}
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test4c([@vm.inferred-type.metadata=dart.async::_Future<dart.core::int*> (skip check)] generic-covariant-impl asy::FutureOr<self::C::T*>* x) → void {}
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test2r([@vm.inferred-type.metadata=#lib::C<dart.core::int*> (skip check)] generic-covariant-impl self::C<asy::FutureOr<self::C::T*>*>* x) → void {}
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test3r([@vm.inferred-type.metadata=#lib::C<dart.async::Future<dart.core::int*>*> (skip check)] generic-covariant-impl self::C<asy::Future<self::C::T*>*>* x) → void {}
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test4r([@vm.inferred-type.metadata=#lib::C<dart.async::Future<dart.core::int*>*> (skip check)] generic-covariant-impl self::C<asy::FutureOr<self::C::T*>*>* x) → void {}
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test5r([@vm.inferred-type.metadata=#lib::C<dart.async::FutureOr<dart.core::int*>*>] generic-covariant-impl self::C<asy::Future<self::C::T*>*>* x) → void {}
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:15,getterSelectorId:16] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test6r([@vm.inferred-type.metadata=#lib::C<dart.async::FutureOr<dart.core::int*>*> (skip check)] generic-covariant-impl self::C<asy::FutureOr<self::C::T*>*>* x) → void {}
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:17,getterSelectorId:18] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test7r([@vm.inferred-type.metadata=#lib::C<dart.async::FutureOr<dart.core::int*>*>] generic-covariant-impl self::C<self::C::T*>* x) → void {}
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:19,getterSelectorId:20] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method test8r([@vm.inferred-type.metadata=#lib::C<dart.async::Future<dart.core::int*>*>] generic-covariant-impl self::C<self::C::T*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method test2c([@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 3)] generic-covariant-impl asy::FutureOr<self::C::T*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method test3c([@vm.inferred-type.metadata=dart.async::_Future<dart.core::int*> (skip check)] generic-covariant-impl asy::Future<self::C::T*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method test4c([@vm.inferred-type.metadata=dart.async::_Future<dart.core::int*> (skip check)] generic-covariant-impl asy::FutureOr<self::C::T*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  method test2r([@vm.inferred-type.metadata=#lib::C<dart.core::int*> (skip check)] generic-covariant-impl self::C<asy::FutureOr<self::C::T*>*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method test3r([@vm.inferred-type.metadata=#lib::C<dart.async::Future<dart.core::int*>*> (skip check)] generic-covariant-impl self::C<asy::Future<self::C::T*>*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method test4r([@vm.inferred-type.metadata=#lib::C<dart.async::Future<dart.core::int*>*> (skip check)] generic-covariant-impl self::C<asy::FutureOr<self::C::T*>*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  method test5r([@vm.inferred-type.metadata=#lib::C<dart.async::FutureOr<dart.core::int*>*>] generic-covariant-impl self::C<asy::Future<self::C::T*>*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  method test6r([@vm.inferred-type.metadata=#lib::C<dart.async::FutureOr<dart.core::int*>*> (skip check)] generic-covariant-impl self::C<asy::FutureOr<self::C::T*>*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  method test7r([@vm.inferred-type.metadata=#lib::C<dart.async::FutureOr<dart.core::int*>*>] generic-covariant-impl self::C<self::C::T*>* x) → void {}
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:19,getterSelectorId:20]  method test8r([@vm.inferred-type.metadata=#lib::C<dart.async::Future<dart.core::int*>*>] generic-covariant-impl self::C<self::C::T*>* x) → void {}
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → dynamic {
+static method main() → dynamic {
   dynamic c = new self::C::•<core::int*>();
   [@vm.direct-call.metadata=#lib::C::test2c] [@vm.inferred-type.metadata=!? (receiver not int)] c.test2c(3);
   [@vm.direct-call.metadata=#lib::C::test3c] [@vm.inferred-type.metadata=!? (receiver not int)] c.test3c([@vm.inferred-type.metadata=dart.async::_Future<dart.core::int*>] asy::Future::value<core::int*>(3));
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/future_or.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/future_or.dart.expect
index fb078b8..d7385b2 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/future_or.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/future_or.dart.expect
@@ -6,39 +6,39 @@
 import "dart:async";
 
 abstract class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
 }
 class B extends self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super self::A::•()
     ;
 }
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field core::Function* unknown;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo1_a1([@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] dynamic x) → void {}
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo1_a2([@vm.inferred-type.metadata=#lib::B] dynamic x) → void {}
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo1_a3([@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] dynamic x) → void {}
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo1_a4([@vm.inferred-type.metadata=#lib::B] dynamic x) → void {}
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo1([@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] asy::Future<self::A*>* a1, [@vm.inferred-type.metadata=#lib::B] self::A* a2, [@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] asy::FutureOr<self::A*>* a3, [@vm.inferred-type.metadata=#lib::B] asy::FutureOr<self::A*>* a4) → void {
+static method foo1_a1([@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] dynamic x) → void {}
+static method foo1_a2([@vm.inferred-type.metadata=#lib::B] dynamic x) → void {}
+static method foo1_a3([@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] dynamic x) → void {}
+static method foo1_a4([@vm.inferred-type.metadata=#lib::B] dynamic x) → void {}
+static method foo1([@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] asy::Future<self::A*>* a1, [@vm.inferred-type.metadata=#lib::B] self::A* a2, [@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] asy::FutureOr<self::A*>* a3, [@vm.inferred-type.metadata=#lib::B] asy::FutureOr<self::A*>* a4) → void {
   self::foo1_a1(a1);
   self::foo1_a2(a2);
   self::foo1_a3(a3);
   self::foo1_a4(a4);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo2_a1([@vm.inferred-type.metadata=dart.async::_Future?] dynamic x) → void {}
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo2_a2([@vm.inferred-type.metadata=#lib::B?] dynamic x) → void {}
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo2_a3(dynamic x) → void {}
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo2_a4(dynamic x) → void {}
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo2([@vm.inferred-type.metadata=dart.async::_Future?] asy::Future<self::A*>* a1, [@vm.inferred-type.metadata=#lib::B?] self::A* a2, asy::FutureOr<self::A*>* a3, asy::FutureOr<self::A*>* a4) → void {
+static method foo2_a1([@vm.inferred-type.metadata=dart.async::_Future?] dynamic x) → void {}
+static method foo2_a2([@vm.inferred-type.metadata=#lib::B?] dynamic x) → void {}
+static method foo2_a3(dynamic x) → void {}
+static method foo2_a4(dynamic x) → void {}
+static method foo2([@vm.inferred-type.metadata=dart.async::_Future?] asy::Future<self::A*>* a1, [@vm.inferred-type.metadata=#lib::B?] self::A* a2, asy::FutureOr<self::A*>* a3, asy::FutureOr<self::A*>* a4) → void {
   self::foo2_a1(a1);
   self::foo2_a2(a2);
   self::foo2_a3(a3);
   self::foo2_a4(a4);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic() → dynamic
+static method getDynamic() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   self::foo1([@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] asy::Future::value<self::B*>(new self::B::•()), new self::B::•(), [@vm.inferred-type.metadata=dart.async::_Future<#lib::B*>] asy::Future::value<self::B*>(new self::B::•()), new self::B::•());
   self::foo2(self::getDynamic() as{TypeError,ForDynamic} asy::Future<self::A*>*, self::getDynamic() as{TypeError,ForDynamic} self::A*, self::getDynamic() as{TypeError,ForDynamic} asy::FutureOr<self::A*>*, self::getDynamic() as{TypeError,ForDynamic} asy::FutureOr<self::A*>*);
 }
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/hello.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/hello.dart.expect
index 63026c8..2296f5b 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/hello.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/hello.dart.expect
@@ -3,12 +3,12 @@
 import "dart:core" as core;
 
 class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo() → core::Object*
+static method foo() → core::Object*
   return new self::A::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   core::print([@vm.inferred-type.metadata=#lib::A] self::foo());
 }
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_cycle.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_cycle.dart.expect
index 2d5e9ca..5226932 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_cycle.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_cycle.dart.expect
@@ -3,100 +3,100 @@
 import "dart:core" as core;
 
 abstract class StreamSubscription extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::StreamSubscription*
+  synthetic constructor •() → self::StreamSubscription*
     : super core::Object::•()
     ;
 }
 class _BufferingStreamSubscription extends self::StreamSubscription {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::_BufferingStreamSubscription*
+  synthetic constructor •() → self::_BufferingStreamSubscription*
     : super self::StreamSubscription::•()
     ;
 }
 class _BroadcastSubscription extends self::StreamSubscription {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::_BroadcastSubscription*
+  synthetic constructor •() → self::_BroadcastSubscription*
     : super self::StreamSubscription::•()
     ;
 }
 abstract class Stream extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::Stream*
+  synthetic constructor •() → self::Stream*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foobar((dynamic) →* void onData, {core::Function* onError = #C1}) → self::StreamSubscription*;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foobar((dynamic) →* void onData, {core::Function* onError = #C1}) → self::StreamSubscription*;
 }
 abstract class _StreamImpl extends self::Stream {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::_StreamImpl*
+  synthetic constructor •() → self::_StreamImpl*
     : super self::Stream::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foobar([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData, {[@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → self::StreamSubscription* {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foobar([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData, {[@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → self::StreamSubscription* {
     return [@vm.inferred-type.metadata=! (skip check)] this.{self::_StreamImpl::_createSubscription}();
   }
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method _createSubscription() → self::StreamSubscription* {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method _createSubscription() → self::StreamSubscription* {
     return new self::_BufferingStreamSubscription::•();
   }
 }
 class _ControllerStream extends self::_StreamImpl {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::_ControllerStream*
+  synthetic constructor •() → self::_ControllerStream*
     : super self::_StreamImpl::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method _createSubscription() → self::StreamSubscription* {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method _createSubscription() → self::StreamSubscription* {
     return new self::_BroadcastSubscription::•();
   }
 }
 class _GeneratedStreamImpl extends self::_StreamImpl {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::_GeneratedStreamImpl*
+  synthetic constructor •() → self::_GeneratedStreamImpl*
     : super self::_StreamImpl::•()
     ;
 }
 abstract class StreamView extends self::Stream {
 [@vm.inferred-type.metadata=!] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  final field self::Stream* _stream;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  constructor •([@vm.inferred-type.metadata=!] self::Stream* stream) → self::StreamView*
+  constructor •([@vm.inferred-type.metadata=!] self::Stream* stream) → self::StreamView*
     : self::StreamView::_stream = stream, super self::Stream::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foobar([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData, {[@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → self::StreamSubscription* {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foobar([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData, {[@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → self::StreamSubscription* {
     return [@vm.direct-call.metadata=#lib::StreamView::_stream] [@vm.inferred-type.metadata=!] this.{self::StreamView::_stream}.{self::Stream::foobar}(onData, onError: onError);
   }
 }
 class ByteStream extends self::StreamView {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  constructor •([@vm.inferred-type.metadata=!] self::Stream* stream) → self::ByteStream*
+  constructor •([@vm.inferred-type.metadata=!] self::Stream* stream) → self::ByteStream*
     : super self::StreamView::•(stream)
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method super_foobar1([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData) → dynamic {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  method super_foobar1([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData) → dynamic {
     super.{self::StreamView::foobar}(onData);
   }
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method super_foobar2([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData) → dynamic {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method super_foobar2([@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData) → dynamic {
     super.{self::StreamView::foobar}(onData);
   }
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method super_foobar3({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → dynamic {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method super_foobar3({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → dynamic {
     super.{self::StreamView::foobar}(onData, onError: onError);
   }
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,getterSelectorId:13]  get super_stream() → self::Stream*
     return [@vm.inferred-type.metadata=!] super.{self::StreamView::_stream};
 }
 class _HandleErrorStream extends self::Stream {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::_HandleErrorStream*
+  synthetic constructor •() → self::_HandleErrorStream*
     : super self::Stream::•()
     ;
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method round0() → void {
+static method round0() → void {
   new self::ByteStream::•(new self::ByteStream::•(new self::_GeneratedStreamImpl::•()));
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method round1({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1}) → void {
+static method round1({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1}) → void {
   self::ByteStream* x = new self::ByteStream::•(new self::ByteStream::•(new self::_GeneratedStreamImpl::•()));
   [@vm.direct-call.metadata=#lib::ByteStream::super_foobar1] [@vm.inferred-type.metadata=!? (skip check)] x.{self::ByteStream::super_foobar1}(onData);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method round2({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → void {
+static method round2({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → void {
   new self::_ControllerStream::•();
   self::Stream* x = new self::_GeneratedStreamImpl::•();
   x = new self::ByteStream::•(x);
   [@vm.direct-call.metadata=#lib::StreamView::foobar] [@vm.inferred-type.metadata=!? (skip check)] x.{self::Stream::foobar}(onData, onError: onError);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method round3({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → void {
+static method round3({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::Function* onError = #C1}) → void {
   self::Stream* x = new self::_GeneratedStreamImpl::•();
   x = new self::ByteStream::•(x);
   x = new self::_ControllerStream::•();
   [@vm.direct-call.metadata=#lib::_StreamImpl::foobar] [@vm.inferred-type.metadata=!? (skip check)] x.{self::Stream::foobar}(onData, onError: onError);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method round4({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1}) → void {
+static method round4({[@vm.inferred-type.metadata=dart.core::Null? (value: null)] (dynamic) →* void onData = #C1}) → void {
   self::ByteStream* x = new self::ByteStream::•(new self::_ControllerStream::•());
   self::Stream* y = [@vm.direct-call.metadata=#lib::ByteStream::super_stream] [@vm.inferred-type.metadata=!] x.{self::ByteStream::super_stream};
   self::Stream* z = [@vm.direct-call.metadata=#lib::StreamView::_stream] [@vm.inferred-type.metadata=!] x.{self::StreamView::_stream};
@@ -104,12 +104,12 @@
     [@vm.direct-call.metadata=#lib::ByteStream::super_foobar2] [@vm.inferred-type.metadata=!? (skip check)] x.{self::ByteStream::super_foobar2}(onData);
   }
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method round5() → void {
+static method round5() → void {
   self::ByteStream* x = new self::ByteStream::•(new self::_GeneratedStreamImpl::•());
   new self::_HandleErrorStream::•();
   [@vm.direct-call.metadata=#lib::ByteStream::super_foobar3] [@vm.inferred-type.metadata=!? (skip check)] x.{self::ByteStream::super_foobar3}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   new self::_GeneratedStreamImpl::•();
   self::round0();
   self::round1();
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_field_initializer.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_field_initializer.dart.expect
index d5ff659..6d5cf67 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_field_initializer.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_field_initializer.dart.expect
@@ -3,80 +3,80 @@
 import "dart:core" as core;
 
 class T1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T1*
+  synthetic constructor •() → self::T1*
     : super core::Object::•()
     ;
 }
 class T2 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T2*
+  synthetic constructor •() → self::T2*
     : super core::Object::•()
     ;
 }
 abstract class A extends core::Object {
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foo() → core::Object*;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foo() → core::Object*;
 }
 class B extends core::Object implements self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → core::Object*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → core::Object*
     return new self::T1::•();
 }
 class C extends core::Object implements self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::C*
+  synthetic constructor •() → self::C*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → core::Object*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → core::Object*
     return new self::T2::•();
 }
 class DeepCaller1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::DeepCaller1*
+  synthetic constructor •() → self::DeepCaller1*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL1() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method barL1() → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller1::barL2] [@vm.inferred-type.metadata=!? (skip check)] this.{self::DeepCaller1::barL2}();
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL2() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method barL2() → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller1::barL3] [@vm.inferred-type.metadata=!? (skip check)] this.{self::DeepCaller1::barL3}();
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL3() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  method barL3() → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller1::barL4] [@vm.inferred-type.metadata=!? (skip check)] this.{self::DeepCaller1::barL4}();
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL4() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method barL4() → dynamic
     return self::field1;
 }
 class D extends core::Object {
 [@vm.inferred-type.metadata=!] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  field core::Object* field2 = [@vm.inferred-type.metadata=!] self::getValue();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::D*
+  synthetic constructor •() → self::D*
     : super core::Object::•()
     ;
 }
 class DeepCaller2 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::DeepCaller2*
+  synthetic constructor •() → self::DeepCaller2*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL1([@vm.inferred-type.metadata=#lib::D] self::D* dd) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method barL1([@vm.inferred-type.metadata=#lib::D] self::D* dd) → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller2::barL2] [@vm.inferred-type.metadata=! (skip check)] this.{self::DeepCaller2::barL2}(dd);
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL2([@vm.inferred-type.metadata=#lib::D] self::D* dd) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method barL2([@vm.inferred-type.metadata=#lib::D] self::D* dd) → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller2::barL3] [@vm.inferred-type.metadata=! (skip check)] this.{self::DeepCaller2::barL3}(dd);
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL3([@vm.inferred-type.metadata=#lib::D] self::D* dd) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  method barL3([@vm.inferred-type.metadata=#lib::D] self::D* dd) → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller2::barL4] [@vm.inferred-type.metadata=! (skip check)] this.{self::DeepCaller2::barL4}(dd);
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL4([@vm.inferred-type.metadata=#lib::D] self::D* dd) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method barL4([@vm.inferred-type.metadata=#lib::D] self::D* dd) → dynamic
     return [@vm.direct-call.metadata=#lib::D::field2] [@vm.inferred-type.metadata=!] dd.{self::D::field2};
 }
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field core::Function* unknown;
 static field core::Object* field1 = [@vm.inferred-type.metadata=!] self::getValue();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic() → dynamic
+static method getDynamic() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getValue() → core::Object* {
+static method getValue() → core::Object* {
   self::A* aa = self::getDynamic() as{TypeError,ForDynamic} self::A*;
   return [@vm.inferred-type.metadata=!] aa.{self::A::foo}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use1([@vm.inferred-type.metadata=#lib::DeepCaller1] self::DeepCaller1* x) → dynamic
+static method use1([@vm.inferred-type.metadata=#lib::DeepCaller1] self::DeepCaller1* x) → dynamic
   return [@vm.direct-call.metadata=#lib::DeepCaller1::barL1] [@vm.inferred-type.metadata=!? (skip check)] x.{self::DeepCaller1::barL1}();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use2([@vm.inferred-type.metadata=#lib::DeepCaller2] self::DeepCaller2* x) → dynamic
+static method use2([@vm.inferred-type.metadata=#lib::DeepCaller2] self::DeepCaller2* x) → dynamic
   return [@vm.direct-call.metadata=#lib::DeepCaller2::barL1] [@vm.inferred-type.metadata=! (skip check)] x.{self::DeepCaller2::barL1}(new self::D::•());
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method createC() → dynamic {
+static method createC() → dynamic {
   new self::C::•();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   new self::B::•();
   self::use1(new self::DeepCaller1::•());
   self::use2(new self::DeepCaller2::•());
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_class1.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_class1.dart.expect
index 0c1a531..95c4d00 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_class1.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_class1.dart.expect
@@ -3,41 +3,41 @@
 import "dart:core" as core;
 
 class T1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T1*
+  synthetic constructor •() → self::T1*
     : super core::Object::•()
     ;
 }
 abstract class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foo() → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foo() → dynamic;
 }
 class B extends self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super self::A::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → dynamic
     return new self::T1::•();
 }
 class Intermediate extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::Intermediate*
+  synthetic constructor •() → self::Intermediate*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method bar([@vm.inferred-type.metadata=#lib::B?] self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method bar([@vm.inferred-type.metadata=#lib::B?] self::A* aa) → dynamic
     return [@vm.direct-call.metadata=#lib::B::foo??] [@vm.inferred-type.metadata=#lib::T1 (skip check)] aa.{self::A::foo}();
 }
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field core::Function* unknown;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use1([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, [@vm.inferred-type.metadata=#lib::B?] self::A* aa) → dynamic
+static method use1([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, [@vm.inferred-type.metadata=#lib::B?] self::A* aa) → dynamic
   return [@vm.direct-call.metadata=#lib::Intermediate::bar] [@vm.inferred-type.metadata=#lib::T1 (skip check)] i.{self::Intermediate::bar}(aa);
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use2([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, [@vm.inferred-type.metadata=#lib::B?] self::A* aa) → dynamic
+static method use2([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, [@vm.inferred-type.metadata=#lib::B?] self::A* aa) → dynamic
   return [@vm.direct-call.metadata=#lib::Intermediate::bar] [@vm.inferred-type.metadata=#lib::T1 (skip check)] i.{self::Intermediate::bar}(aa);
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic() → dynamic
+static method getDynamic() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method allocateB() → dynamic {
+static method allocateB() → dynamic {
   new self::B::•();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   self::use1(new self::Intermediate::•(), self::getDynamic() as{TypeError,ForDynamic} self::A*);
   self::allocateB();
   self::use2(new self::Intermediate::•(), self::getDynamic() as{TypeError,ForDynamic} self::A*);
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_class2.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_class2.dart.expect
index 145cb92..6149267 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_class2.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_class2.dart.expect
@@ -3,70 +3,70 @@
 import "dart:core" as core;
 
 class T1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T1*
+  synthetic constructor •() → self::T1*
     : super core::Object::•()
     ;
 }
 class T2 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T2*
+  synthetic constructor •() → self::T2*
     : super core::Object::•()
     ;
 }
 abstract class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foo() → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foo() → dynamic;
 }
 class B extends self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super self::A::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → dynamic
     return new self::T1::•();
 }
 abstract class C extends core::Object implements self::B {
 }
 abstract class D extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::D*
+  synthetic constructor •() → self::D*
     : super core::Object::•()
     ;
 }
 abstract class _E&D&C extends self::D implements self::C /*isAnonymousMixin,isEliminatedMixin*/  {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::_E&D&C*
+  synthetic constructor •() → self::_E&D&C*
     : super self::D::•()
     ;
 }
 class E extends self::_E&D&C {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::E*
+  synthetic constructor •() → self::E*
     : super self::_E&D&C::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → dynamic
     return new self::T2::•();
 }
 class Intermediate extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::Intermediate*
+  synthetic constructor •() → self::Intermediate*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method bar(self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method bar(self::A* aa) → dynamic
     return [@vm.inferred-type.metadata=!] aa.{self::A::foo}();
 }
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field core::Function* unknown;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use1([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, self::A* aa) → dynamic
+static method use1([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, self::A* aa) → dynamic
   return [@vm.direct-call.metadata=#lib::Intermediate::bar] [@vm.inferred-type.metadata=! (skip check)] i.{self::Intermediate::bar}(aa);
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use2([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, self::A* aa) → dynamic
+static method use2([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, self::A* aa) → dynamic
   return [@vm.direct-call.metadata=#lib::Intermediate::bar] [@vm.inferred-type.metadata=! (skip check)] i.{self::Intermediate::bar}(aa);
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use3([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, self::A* aa) → dynamic
+static method use3([@vm.inferred-type.metadata=#lib::Intermediate] self::Intermediate* i, self::A* aa) → dynamic
   return [@vm.direct-call.metadata=#lib::Intermediate::bar] [@vm.inferred-type.metadata=! (skip check)] i.{self::Intermediate::bar}(aa);
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic() → dynamic
+static method getDynamic() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method allocateB() → dynamic {
+static method allocateB() → dynamic {
   new self::B::•();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method allocateE() → dynamic {
+static method allocateE() → dynamic {
   new self::E::•();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   self::use1(new self::Intermediate::•(), self::getDynamic() as{TypeError,ForDynamic} self::A*);
   self::allocateB();
   self::use2(new self::Intermediate::•(), self::getDynamic() as{TypeError,ForDynamic} self::A*);
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_dynamic_target.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_dynamic_target.dart.expect
index e950fb6..c86de6e 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_dynamic_target.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_new_dynamic_target.dart.expect
@@ -3,60 +3,60 @@
 import "dart:core" as core;
 
 class T1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T1*
+  synthetic constructor •() → self::T1*
     : super core::Object::•()
     ;
 }
 class T2 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T2*
+  synthetic constructor •() → self::T2*
     : super core::Object::•()
     ;
 }
 class T3 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T3*
+  synthetic constructor •() → self::T3*
     : super core::Object::•()
     ;
 }
 class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → dynamic
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → dynamic
     return new self::T1::•();
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method bar() → dynamic
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method bar() → dynamic
     return new self::T2::•();
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method bazz() → dynamic
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method bazz() → dynamic
     return new self::T3::•();
 }
 class B extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → dynamic
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → dynamic
     return new self::T1::•();
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method bar() → dynamic
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method bar() → dynamic
     return new self::T2::•();
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method bazz() → dynamic
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method bazz() → dynamic
     return new self::T3::•();
 }
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field core::Function* unknown;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use_foo1(dynamic x) → dynamic
+static method use_foo1(dynamic x) → dynamic
   return [@vm.inferred-type.metadata=#lib::T1] x.foo();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use_foo2(dynamic x) → dynamic
+static method use_foo2(dynamic x) → dynamic
   return [@vm.inferred-type.metadata=#lib::T1] x.foo();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use_bar(dynamic x) → dynamic
+static method use_bar(dynamic x) → dynamic
   return [@vm.inferred-type.metadata=#lib::T2] x.bar();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use_bazz(dynamic x) → dynamic
+static method use_bazz(dynamic x) → dynamic
   return [@vm.inferred-type.metadata=#lib::T3] x.bazz();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic() → dynamic
+static method getDynamic() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method allocateA() → dynamic {
+static method allocateA() → dynamic {
   new self::A::•();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method allocateB() → dynamic {
+static method allocateB() → dynamic {
   new self::B::•();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   self::use_foo1(self::getDynamic());
   self::allocateA();
   self::use_foo2(self::getDynamic());
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_set_field.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_set_field.dart.expect
index 6cc04be..6698bb7 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_set_field.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_set_field.dart.expect
@@ -3,59 +3,59 @@
 import "dart:core" as core;
 
 class T1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T1*
+  synthetic constructor •() → self::T1*
     : super core::Object::•()
     ;
 }
 class T2 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T2*
+  synthetic constructor •() → self::T2*
     : super core::Object::•()
     ;
 }
 class A extends core::Object {
 [@vm.inferred-type.metadata=#lib::T1] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  field dynamic field1 = new self::T1::•();
 [@vm.inferred-type.metadata=!] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  field dynamic field2 = new self::T1::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
 }
 class DeepCaller1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::DeepCaller1*
+  synthetic constructor •() → self::DeepCaller1*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL1([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method barL1([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller1::barL2] [@vm.inferred-type.metadata=#lib::T1 (skip check)] this.{self::DeepCaller1::barL2}(aa);
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL2([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  method barL2([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller1::barL3] [@vm.inferred-type.metadata=#lib::T1 (skip check)] this.{self::DeepCaller1::barL3}(aa);
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL3([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method barL3([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller1::barL4] [@vm.inferred-type.metadata=#lib::T1 (skip check)] this.{self::DeepCaller1::barL4}(aa);
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL4([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method barL4([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
     return [@vm.direct-call.metadata=#lib::A::field1??] [@vm.inferred-type.metadata=#lib::T1] aa.{self::A::field1};
 }
 class DeepCaller2 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::DeepCaller2*
+  synthetic constructor •() → self::DeepCaller2*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL1([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method barL1([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller2::barL2] [@vm.inferred-type.metadata=! (skip check)] this.{self::DeepCaller2::barL2}(aa);
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL2([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  method barL2([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller2::barL3] [@vm.inferred-type.metadata=! (skip check)] this.{self::DeepCaller2::barL3}(aa);
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL3([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method barL3([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
     return [@vm.direct-call.metadata=#lib::DeepCaller2::barL4] [@vm.inferred-type.metadata=! (skip check)] this.{self::DeepCaller2::barL4}(aa);
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method barL4([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method barL4([@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
     return [@vm.direct-call.metadata=#lib::A::field2??] [@vm.inferred-type.metadata=!] aa.{self::A::field2};
 }
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field core::Function* unknown;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use1([@vm.inferred-type.metadata=#lib::DeepCaller1] self::DeepCaller1* x, [@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+static method use1([@vm.inferred-type.metadata=#lib::DeepCaller1] self::DeepCaller1* x, [@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
   return [@vm.direct-call.metadata=#lib::DeepCaller1::barL1] [@vm.inferred-type.metadata=#lib::T1 (skip check)] x.{self::DeepCaller1::barL1}(aa);
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use2([@vm.inferred-type.metadata=#lib::DeepCaller2] self::DeepCaller2* x, [@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
+static method use2([@vm.inferred-type.metadata=#lib::DeepCaller2] self::DeepCaller2* x, [@vm.inferred-type.metadata=#lib::A?] self::A* aa) → dynamic
   return [@vm.direct-call.metadata=#lib::DeepCaller2::barL1] [@vm.inferred-type.metadata=! (skip check)] x.{self::DeepCaller2::barL1}(aa);
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic() → dynamic
+static method getDynamic() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method setField2([@vm.inferred-type.metadata=#lib::A] self::A* aa, [@vm.inferred-type.metadata=#lib::T2] dynamic value) → void {
+static method setField2([@vm.inferred-type.metadata=#lib::A] self::A* aa, [@vm.inferred-type.metadata=#lib::T2] dynamic value) → void {
   [@vm.direct-call.metadata=#lib::A::field2] [@vm.inferred-type.metadata=!? (skip check)] aa.{self::A::field2} = value;
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   new self::A::•();
   new self::T1::•();
   new self::T2::•();
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_set_field2.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_set_field2.dart.expect
index 4ed4d6c..9372e70 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_set_field2.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_set_field2.dart.expect
@@ -3,40 +3,40 @@
 import "dart:core" as core;
 
 class T1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T1*
+  synthetic constructor •() → self::T1*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method go() → self::T3*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method go() → self::T3*
     return new self::T3::•();
 }
 class T2 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T2*
+  synthetic constructor •() → self::T2*
     : super core::Object::•()
     ;
 }
 class T3 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T3*
+  synthetic constructor •() → self::T3*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method run() → dynamic {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method run() → dynamic {
     core::print("hi");
   }
 }
 class Q<T extends core::Object* = dynamic> extends core::Object {
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  final field self::Q::T* result;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  constructor •(self::Q::T* result) → self::Q<self::Q::T*>*
+  constructor •(self::Q::T* result) → self::Q<self::Q::T*>*
     : self::Q::result = result, super core::Object::•()
     ;
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo1([@vm.inferred-type.metadata=dart.core::_GrowableList<#lib::T1*>] core::List<self::T1*>* list) → dynamic {
+static method foo1([@vm.inferred-type.metadata=dart.core::_GrowableList<#lib::T1*>] core::List<self::T1*>* list) → dynamic {
   [@vm.direct-call.metadata=#lib::T3::run] [@vm.inferred-type.metadata=!? (skip check)] [@vm.direct-call.metadata=#lib::T1::go??] [@vm.inferred-type.metadata=#lib::T3 (skip check)] [@vm.direct-call.metadata=#lib::Q::result??] [@vm.direct-call.metadata=dart._internal::ListIterable::first] [@vm.inferred-type.metadata=#lib::Q?] [@vm.direct-call.metadata=dart.collection::_ListBase&Object&ListMixin::map] [@vm.inferred-type.metadata=dart._internal::MappedListIterable<#lib::T1*, ?> (skip check)] list.{core::Iterable::map}<self::Q<self::T1*>*>((self::T1* t1) → self::Q<self::T1*>* => new self::Q::•<self::T1*>(t1)).{core::Iterable::first}.{self::Q::result}.{self::T1::go}().{self::T3::run}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo2NewValue() → self::Q<dynamic>*
+static method foo2NewValue() → self::Q<dynamic>*
   return new self::Q::•<self::T2*>(new self::T2::•());
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo3NewT1() → dynamic {
+static method foo3NewT1() → dynamic {
   new self::T1::•();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   self::foo1(<self::T1*>[]);
   self::foo2NewValue();
   self::foo3NewT1();
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_while_processing.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_while_processing.dart.expect
index bb8ca0f..3390a91 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_while_processing.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/invalidation_while_processing.dart.expect
@@ -3,34 +3,34 @@
 import "dart:core" as core;
 
 abstract class I extends core::Object {
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foo() → void;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foo() → void;
 }
 class T1 extends core::Object implements self::I {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T1*
+  synthetic constructor •() → self::T1*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → void {}
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → void {}
 }
 class T2 extends core::Object implements self::I {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T2*
+  synthetic constructor •() → self::T2*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → void {}
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → void {}
 }
 class Point extends core::Object /*hasConstConstructor*/  {
 [@vm.inferred-type.metadata=!] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  final field self::I* x;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  const constructor •([@vm.inferred-type.metadata=!] self::I* x) → self::Point*
+  const constructor •([@vm.inferred-type.metadata=!] self::I* x) → self::Point*
     : self::Point::x = x, super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method newPoint1() → self::Point*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method newPoint1() → self::Point*
     return new self::Point::•([@vm.direct-call.metadata=#lib::Point::x] [@vm.inferred-type.metadata=!] this.{self::Point::x});
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method newPoint2() → self::Point*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method newPoint2() → self::Point*
     return new self::Point::•([@vm.direct-call.metadata=#lib::Point::x] [@vm.inferred-type.metadata=!] this.{self::Point::x});
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getX([@vm.inferred-type.metadata=#lib::Point] dynamic point) → dynamic {
+static method getX([@vm.inferred-type.metadata=#lib::Point] dynamic point) → dynamic {
   [@vm.direct-call.metadata=#lib::Point::x] [@vm.inferred-type.metadata=!? (receiver not int)] point.x;
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → dynamic {
+static method main() → dynamic {
   self::Point* a = new self::Point::•(new self::T1::•());
   core::print([@vm.direct-call.metadata=#lib::Point::x] [@vm.inferred-type.metadata=!] a.{self::Point::x});
   self::Point* c = new self::Point::•(new self::T2::•());
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/no_such_method.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/no_such_method.dart.expect
index d8952be..fa129ad 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/no_such_method.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/no_such_method.dart.expect
@@ -4,118 +4,118 @@
 import "dart:_internal" as _in;
 
 class T1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T1*
+  synthetic constructor •() → self::T1*
     : super core::Object::•()
     ;
 }
 class T2 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T2*
+  synthetic constructor •() → self::T2*
     : super core::Object::•()
     ;
 }
 class T4 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T4*
+  synthetic constructor •() → self::T4*
     : super core::Object::•()
     ;
 }
 class T5 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T5*
+  synthetic constructor •() → self::T5*
     : super core::Object::•()
     ;
 }
 class T6 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T6*
+  synthetic constructor •() → self::T6*
     : super core::Object::•()
     ;
 }
 class T7 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T7*
+  synthetic constructor •() → self::T7*
     : super core::Object::•()
     ;
 }
 abstract class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foo() → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foo() → dynamic;
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,getterSelectorId:3]  abstract get bar() → dynamic;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:4,getterSelectorId:5] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method bazz(dynamic a1, dynamic a2, dynamic a3, [dynamic a4 = #C1, dynamic a5 = #C1]) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:4,getterSelectorId:5]  abstract method bazz(dynamic a1, dynamic a2, dynamic a3, [dynamic a4 = #C1, dynamic a5 = #C1]) → dynamic;
 }
 class B extends self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super self::A::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method noSuchMethod(core::Invocation* invocation) → dynamic {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7]  method noSuchMethod(core::Invocation* invocation) → dynamic {
     return new self::T1::•();
   }
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,getterSelectorId:3]  no-such-method-forwarder get bar() → dynamic
     return _in::unsafeCast<dynamic>([@vm.direct-call.metadata=#lib::B::noSuchMethod] [@vm.inferred-type.metadata=#lib::T1 (skip check)] this.{self::B::noSuchMethod}(new core::_InvocationMirror::_withType(#C2, 1, #C3, #C4, [@vm.inferred-type.metadata=dart.collection::UnmodifiableMapView<dart.core::Symbol*, dynamic>] core::Map::unmodifiable<core::Symbol*, dynamic>(#C5))));
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  no-such-method-forwarder method foo() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  no-such-method-forwarder method foo() → dynamic
     return _in::unsafeCast<dynamic>([@vm.direct-call.metadata=#lib::B::noSuchMethod] [@vm.inferred-type.metadata=#lib::T1 (skip check)] this.{self::B::noSuchMethod}(new core::_InvocationMirror::_withType(#C6, 0, #C3, #C4, [@vm.inferred-type.metadata=dart.collection::UnmodifiableMapView<dart.core::Symbol*, dynamic>] core::Map::unmodifiable<core::Symbol*, dynamic>(#C5))));
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:4,getterSelectorId:5] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  no-such-method-forwarder method bazz([@vm.inferred-type.metadata=dart.core::_Smi (value: 1)] dynamic a1, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic a2, [@vm.inferred-type.metadata=dart.core::_Smi (value: 3)] dynamic a3, [[@vm.inferred-type.metadata=dart.core::_Smi (value: 4)] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] dynamic a5 = #C1]) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:4,getterSelectorId:5]  no-such-method-forwarder method bazz([@vm.inferred-type.metadata=dart.core::_Smi (value: 1)] dynamic a1, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic a2, [@vm.inferred-type.metadata=dart.core::_Smi (value: 3)] dynamic a3, [[@vm.inferred-type.metadata=dart.core::_Smi (value: 4)] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] dynamic a5 = #C1]) → dynamic
     return _in::unsafeCast<dynamic>([@vm.direct-call.metadata=#lib::B::noSuchMethod] [@vm.inferred-type.metadata=#lib::T1 (skip check)] this.{self::B::noSuchMethod}(new core::_InvocationMirror::_withType(#C7, 0, #C3, core::List::unmodifiable<dynamic>(<dynamic>[a1, a2, a3, a4, a5]), [@vm.inferred-type.metadata=dart.collection::UnmodifiableMapView<dart.core::Symbol*, dynamic>] core::Map::unmodifiable<core::Symbol*, dynamic>(#C5))));
 }
 abstract class C extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::C*
+  synthetic constructor •() → self::C*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method noSuchMethod(core::Invocation* invocation) → dynamic {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7]  method noSuchMethod(core::Invocation* invocation) → dynamic {
     return new self::T2::•();
   }
 }
 class D extends self::C implements self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::D*
+  synthetic constructor •() → self::D*
     : super self::C::•()
     ;
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,getterSelectorId:3]  no-such-method-forwarder get bar() → dynamic
     return _in::unsafeCast<dynamic>([@vm.direct-call.metadata=#lib::C::noSuchMethod] [@vm.inferred-type.metadata=#lib::T2 (skip check)] this.{self::C::noSuchMethod}(new core::_InvocationMirror::_withType(#C2, 1, #C3, #C4, [@vm.inferred-type.metadata=dart.collection::UnmodifiableMapView<dart.core::Symbol*, dynamic>] core::Map::unmodifiable<core::Symbol*, dynamic>(#C5))));
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  no-such-method-forwarder method foo() → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  no-such-method-forwarder method foo() → dynamic
     return _in::unsafeCast<dynamic>([@vm.direct-call.metadata=#lib::C::noSuchMethod] [@vm.inferred-type.metadata=#lib::T2 (skip check)] this.{self::C::noSuchMethod}(new core::_InvocationMirror::_withType(#C6, 0, #C3, #C4, [@vm.inferred-type.metadata=dart.collection::UnmodifiableMapView<dart.core::Symbol*, dynamic>] core::Map::unmodifiable<core::Symbol*, dynamic>(#C5))));
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:4,getterSelectorId:5] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  no-such-method-forwarder method bazz([@vm.inferred-type.metadata=dart.core::_Smi (value: 1)] dynamic a1, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic a2, [@vm.inferred-type.metadata=dart.core::_Smi (value: 3)] dynamic a3, [[@vm.inferred-type.metadata=dart.core::_Smi (value: 4)] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] dynamic a5 = #C1]) → dynamic
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:4,getterSelectorId:5]  no-such-method-forwarder method bazz([@vm.inferred-type.metadata=dart.core::_Smi (value: 1)] dynamic a1, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic a2, [@vm.inferred-type.metadata=dart.core::_Smi (value: 3)] dynamic a3, [[@vm.inferred-type.metadata=dart.core::_Smi (value: 4)] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::Null? (value: null)] dynamic a5 = #C1]) → dynamic
     return _in::unsafeCast<dynamic>([@vm.direct-call.metadata=#lib::C::noSuchMethod] [@vm.inferred-type.metadata=#lib::T2 (skip check)] this.{self::C::noSuchMethod}(new core::_InvocationMirror::_withType(#C7, 0, #C3, core::List::unmodifiable<dynamic>(<dynamic>[a1, a2, a3, a4, a5]), [@vm.inferred-type.metadata=dart.collection::UnmodifiableMapView<dart.core::Symbol*, dynamic>] core::Map::unmodifiable<core::Symbol*, dynamic>(#C5))));
 }
 class E extends core::Object implements self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::E*
+  synthetic constructor •() → self::E*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method noSuchMethod(core::Invocation* invocation) → dynamic {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7]  method noSuchMethod(core::Invocation* invocation) → dynamic {
     return new self::T4::•();
   }
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,getterSelectorId:3]  no-such-method-forwarder get bar() → dynamic
     return _in::unsafeCast<dynamic>([@vm.direct-call.metadata=#lib::E::noSuchMethod] [@vm.inferred-type.metadata=#lib::T4 (skip check)] this.{self::E::noSuchMethod}(new core::_InvocationMirror::_withType(#C2, 1, #C3, #C4, [@vm.inferred-type.metadata=dart.collection::UnmodifiableMapView<dart.core::Symbol*, dynamic>] core::Map::unmodifiable<core::Symbol*, dynamic>(#C5))));
 }
 class F extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::F*
+  synthetic constructor •() → self::F*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method noSuchMethod(core::Invocation* invocation) → dynamic {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7]  method noSuchMethod(core::Invocation* invocation) → dynamic {
     return new self::T2::•();
   }
 }
 class G extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::G*
+  synthetic constructor •() → self::G*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method noSuchMethod(core::Invocation* invocation) → dynamic {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7]  method noSuchMethod(core::Invocation* invocation) → dynamic {
     return new self::T5::•();
   }
 }
 class H extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::H*
+  synthetic constructor •() → self::H*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo({[@vm.inferred-type.metadata=dart.core::_Smi (value: 1)] dynamic left = #C1, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic right = #C1}) → dynamic
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo({[@vm.inferred-type.metadata=dart.core::_Smi (value: 1)] dynamic left = #C1, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic right = #C1}) → dynamic
     return new self::T6::•();
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method noSuchMethod(core::Invocation* invocation) → dynamic {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:6,getterSelectorId:7]  method noSuchMethod(core::Invocation* invocation) → dynamic {
     return new self::T7::•();
   }
 }
 [@vm.inferred-type.metadata=#lib::B?]static field self::A* bb = new self::B::•();
 [@vm.inferred-type.metadata=#lib::D?]static field self::A* dd = new self::D::•();
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field core::Function* unknown;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic() → dynamic
+static method getDynamic() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   core::print([@vm.direct-call.metadata=#lib::B::foo??] [@vm.inferred-type.metadata=#lib::T1 (skip check)] [@vm.inferred-type.metadata=#lib::B?] self::bb.{self::A::foo}());
   core::print([@vm.direct-call.metadata=#lib::B::bar??] [@vm.inferred-type.metadata=#lib::T1] [@vm.inferred-type.metadata=#lib::B?] self::bb.{self::A::bar});
   core::print([@vm.direct-call.metadata=#lib::B::bazz??] [@vm.inferred-type.metadata=#lib::T1 (skip check)] [@vm.inferred-type.metadata=#lib::B?] self::bb.{self::A::bazz}(1, 2, 3, 4));
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/param_types_before_strong_mode_checks.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/param_types_before_strong_mode_checks.dart.expect
index f28ccae..0378cce 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/param_types_before_strong_mode_checks.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/param_types_before_strong_mode_checks.dart.expect
@@ -3,56 +3,56 @@
 import "dart:core" as core;
 
 abstract class T0 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T0*
+  synthetic constructor •() → self::T0*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foo() → void;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foo() → void;
 }
 class T2 extends self::T0 {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T2*
+  synthetic constructor •() → self::T2*
     : super self::T0::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → void {}
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → void {}
 }
 class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method method1(self::T0* t0) → void {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method method1(self::T0* t0) → void {
     [@vm.direct-call.metadata=#lib::T2::foo??] [@vm.inferred-type.metadata=!? (skip check)] t0.{self::T0::foo}();
   }
 }
 abstract class B extends core::Object {
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method method2(covariant dynamic arg) → void;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  abstract method method2(covariant dynamic arg) → void;
 }
 class C extends core::Object implements self::B {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::C*
+  synthetic constructor •() → self::C*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method method2(covariant self::T0* t0) → void {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method method2(covariant self::T0* t0) → void {
     [@vm.direct-call.metadata=#lib::T2::foo??] [@vm.inferred-type.metadata=!? (skip check)] t0.{self::T0::foo}();
   }
 }
 class D extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::D*
+  synthetic constructor •() → self::D*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method method3(self::T0* t0) → void {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  method method3(self::T0* t0) → void {
     [@vm.direct-call.metadata=#lib::T2::foo??] [@vm.inferred-type.metadata=!? (skip check)] t0.{self::T0::foo}();
   }
 }
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field core::Function* unknown;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method func1([@vm.inferred-type.metadata=#lib::T2?] self::T0* t0) → void {
+static method func1([@vm.inferred-type.metadata=#lib::T2?] self::T0* t0) → void {
   [@vm.direct-call.metadata=#lib::T2::foo??] [@vm.inferred-type.metadata=!? (skip check)] t0.{self::T0::foo}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method func2(self::T0* t0) → void {
+static method func2(self::T0* t0) → void {
   [@vm.direct-call.metadata=#lib::T2::foo??] [@vm.inferred-type.metadata=!? (skip check)] t0.{self::T0::foo}();
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic() → dynamic
+static method getDynamic() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method use(dynamic x) → dynamic
+static method use(dynamic x) → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown.call(x);
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   self::func1(self::getDynamic() as{TypeError,ForDynamic} self::T0*);
   self::use(#C1);
   self::use(new self::A::•().{self::A::method1});
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/regress_37455.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/regress_37455.dart.expect
index 37be74f..a7ca2b5 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/regress_37455.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/regress_37455.dart.expect
@@ -4,17 +4,17 @@
 
 class A extends core::Object {
 [@vm.inferred-type.metadata=dart.core::_GrowableList<dynamic>] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  final field core::List<dynamic>* afield;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  constructor •([@vm.inferred-type.metadata=dart.core::_GrowableList<dynamic>] core::List<dynamic>* afield) → self::A*
+  constructor •([@vm.inferred-type.metadata=dart.core::_GrowableList<dynamic>] core::List<dynamic>* afield) → self::A*
     : self::A::afield = afield, super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method toString() → core::String*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method toString() → core::String*
     return [@vm.direct-call.metadata=dart.core::_GrowableList::toString] [@vm.inferred-type.metadata=!? (skip check) (receiver not int)] [@vm.direct-call.metadata=#lib::A::afield] [@vm.inferred-type.metadata=dart.core::_GrowableList<dynamic>] this.{self::A::afield}.{core::Object::toString}();
 }
 class B extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method _foo([@vm.inferred-type.metadata=dart._internal::ListIterator<dart.core::int*>] core::Iterator<core::int*>* iter) → core::List<dynamic>* {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method _foo([@vm.inferred-type.metadata=dart._internal::ListIterator<dart.core::int*>] core::Iterator<core::int*>* iter) → core::List<dynamic>* {
     core::List<dynamic>* result = <dynamic>[];
     while ([@vm.direct-call.metadata=dart._internal::ListIterator::moveNext] [@vm.inferred-type.metadata=dart.core::bool (skip check)] iter.{core::Iterator::moveNext}()) {
       if([@vm.direct-call.metadata=dart.core::_IntegerImplementation::<??] [@vm.inferred-type.metadata=dart.core::bool (skip check)] [@vm.direct-call.metadata=dart._internal::ListIterator::current] [@vm.inferred-type.metadata=int?] iter.{core::Iterator::current}.{core::num::<}(0)) {
@@ -25,7 +25,7 @@
     return result;
   }
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → void {
+static method main() → void {
   core::List<dynamic>* list = [@vm.direct-call.metadata=#lib::B::_foo] [@vm.inferred-type.metadata=dart.core::_GrowableList<dynamic> (skip check)] new self::B::•().{self::B::_foo}([@vm.direct-call.metadata=dart.core::_GrowableList::iterator] [@vm.inferred-type.metadata=dart._internal::ListIterator<dart.core::int*>]<core::int*>[1, 2, 3].{core::Iterable::iterator});
   core::print(list);
 }
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/regress_37719.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/regress_37719.dart.expect
index 823e781..de17976 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/regress_37719.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/regress_37719.dart.expect
@@ -2,7 +2,7 @@
 import self as self;
 import "dart:core" as core;
 
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method foo([@vm.inferred-type.metadata=dart.core::_GrowableList<dart.core::int*>] core::List<core::int*>* x) → dynamic
+[@vm.unboxing-info.metadata=(b)->i]static method foo([@vm.inferred-type.metadata=dart.core::_GrowableList<dart.core::int*>] core::List<core::int*>* x) → dynamic
   return [@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] 1.{core::num::+}([@vm.direct-call.metadata=dart.core::_GrowableList::[]] [@vm.inferred-type.metadata=int? (skip check)] x.{core::List::[]}(0));
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → dynamic
+static method main() → dynamic
   return [@vm.inferred-type.metadata=dart.core::Null? (value: null)] core::print([@vm.inferred-type.metadata=int] self::foo(<core::int*>[1]));
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/regress_flutter16182.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/regress_flutter16182.dart.expect
index ce77fcd..ab1a24e 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/regress_flutter16182.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/regress_flutter16182.dart.expect
@@ -7,104 +7,104 @@
 import "package:expect/expect.dart";
 
 class T1 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T1*
+  synthetic constructor •() → self::T1*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method doTest1() → void {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method doTest1() → void {
     self::ok = true;
   }
 }
 class A1 extends core::Object {
 [@vm.inferred-type.metadata=#lib::T1?] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  field self::T1* foo = null;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A1*
+  synthetic constructor •() → self::A1*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method call([dynamic a1 = #C1, dynamic a2 = #C1, dynamic a3 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a4 = #C1, [@vm.inferred-type.metadata=#lib::T1?] dynamic a5 = #C1]) → void {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method call([dynamic a1 = #C1, dynamic a2 = #C1, dynamic a3 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a4 = #C1, [@vm.inferred-type.metadata=#lib::T1?] dynamic a5 = #C1]) → void {
     [@vm.direct-call.metadata=#lib::A1::foo] [@vm.inferred-type.metadata=!? (skip check)] this.{self::A1::foo} = _in::unsafeCast<self::T1*>(a5);
   }
 }
 class B1 extends core::Object {
 [@vm.inferred-type.metadata=#lib::A1] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  field self::A1* aa1 = new self::A1::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B1*
+  synthetic constructor •() → self::B1*
     : super core::Object::•()
     ;
 }
 class T2 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T2*
+  synthetic constructor •() → self::T2*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method doTest2() → void {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method doTest2() → void {
     self::ok = true;
   }
 }
 class A2 extends core::Object {
 [@vm.inferred-type.metadata=#lib::T2?] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  field dynamic foo = null;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A2*
+  synthetic constructor •() → self::A2*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method call([dynamic a1 = #C1, dynamic a2 = #C1, dynamic a3 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a5 = #C1, [@vm.inferred-type.metadata=#lib::T2?] dynamic a6 = #C1]) → void {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method call([dynamic a1 = #C1, dynamic a2 = #C1, dynamic a3 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a5 = #C1, [@vm.inferred-type.metadata=#lib::T2?] dynamic a6 = #C1]) → void {
     [@vm.direct-call.metadata=#lib::A2::foo] [@vm.inferred-type.metadata=!? (skip check)] this.{self::A2::foo} = a6;
   }
 }
 abstract class B2Base extends core::Object {
 [@vm.inferred-type.metadata=#lib::A2] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:12,getterSelectorId:13]  field dynamic _aa = new self::A2::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B2Base*
+  synthetic constructor •() → self::B2Base*
     : super core::Object::•()
     ;
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,getterSelectorId:11]  get aa2() → dynamic
     return [@vm.direct-call.metadata=#lib::B2Base::_aa] [@vm.inferred-type.metadata=#lib::A2] this.{self::B2Base::_aa};
 }
 class B2 extends self::B2Base {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B2*
+  synthetic constructor •() → self::B2*
     : super self::B2Base::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:14,getterSelectorId:15] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method doSuperCall() → void {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:14,getterSelectorId:15]  method doSuperCall() → void {
     [@vm.call-site-attributes.metadata=receiverType:dynamic] [@vm.direct-call.metadata=#lib::A2::call] [@vm.inferred-type.metadata=!? (receiver not int)] [@vm.inferred-type.metadata=#lib::A2] super.{self::B2Base::aa2}.call(1, 2, 3, 4, 5, new self::T2::•());
   }
 }
 class T3 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T3*
+  synthetic constructor •() → self::T3*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:16,getterSelectorId:17] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method doTest3() → void {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:16,getterSelectorId:17]  method doTest3() → void {
     self::ok = true;
   }
 }
 class A3 extends core::Object {
 [@vm.inferred-type.metadata=#lib::T3?] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  field dynamic foo = null;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A3*
+  synthetic constructor •() → self::A3*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method call([dynamic a1 = #C1, dynamic a2 = #C1, dynamic a3 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a5 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a6 = #C1, [@vm.inferred-type.metadata=#lib::T3?] dynamic a7 = #C1]) → void {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method call([dynamic a1 = #C1, dynamic a2 = #C1, dynamic a3 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a5 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a6 = #C1, [@vm.inferred-type.metadata=#lib::T3?] dynamic a7 = #C1]) → void {
     [@vm.direct-call.metadata=#lib::A3::foo] [@vm.inferred-type.metadata=!? (skip check)] this.{self::A3::foo} = a7;
   }
 }
 class B3 extends core::Object {
 [@vm.inferred-type.metadata=#lib::A3] [@vm.procedure-attributes.metadata=hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:18,getterSelectorId:19]  field self::A3* aa3 = new self::A3::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B3*
+  synthetic constructor •() → self::B3*
     : super core::Object::•()
     ;
 }
 class T4 extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::T4*
+  synthetic constructor •() → self::T4*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:20,getterSelectorId:21] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method doTest4() → void {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:20,getterSelectorId:21]  method doTest4() → void {
     self::ok = true;
   }
 }
 class A4 extends core::Object {
 [@vm.inferred-type.metadata=#lib::T4?] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  field dynamic foo = null;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A4*
+  synthetic constructor •() → self::A4*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method call([dynamic a1 = #C1, dynamic a2 = #C1, dynamic a3 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a5 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a6 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a7 = #C1, [@vm.inferred-type.metadata=#lib::T4?] dynamic a8 = #C1]) → void {
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method call([dynamic a1 = #C1, dynamic a2 = #C1, dynamic a3 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a4 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a5 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a6 = #C1, [@vm.inferred-type.metadata=dart.core::_Smi?] dynamic a7 = #C1, [@vm.inferred-type.metadata=#lib::T4?] dynamic a8 = #C1]) → void {
     [@vm.direct-call.metadata=#lib::A4::foo] [@vm.inferred-type.metadata=!? (skip check)] this.{self::A4::foo} = a8;
   }
 }
 class B4 extends core::Object {
 [@vm.inferred-type.metadata=#lib::A4] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:12,getterSelectorId:13]  field dynamic _aa = new self::A4::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B4*
+  synthetic constructor •() → self::B4*
     : super core::Object::•()
     ;
 [@vm.procedure-attributes.metadata=hasThisUses:false,hasTearOffUses:false,getterSelectorId:22]  get aa4() → dynamic
@@ -115,37 +115,37 @@
 [@vm.inferred-type.metadata=dart.core::_Closure?]static field core::Function* unknown3 = () → dynamic => self::bb3;
 [@vm.inferred-type.metadata=#lib::B4?]static field dynamic bb4 = new self::B4::•();
 [@vm.inferred-type.metadata=dart.core::_Closure?]static field core::Function* unknown4 = () → dynamic => self::bb4;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method test1() → void {
+static method test1() → void {
   self::B1* bb = new self::B1::•();
   let final self::B1* #t1 = bb in let final core::int* #t2 = 1 in let final core::int* #t3 = 2 in let final core::int* #t4 = 3 in let final core::int* #t5 = 4 in let final self::T1* #t6 = new self::T1::•() in [@vm.call-site-attributes.metadata=receiverType:#lib::A1*] [@vm.direct-call.metadata=#lib::A1::call] [@vm.inferred-type.metadata=!? (skip check)] [@vm.direct-call.metadata=#lib::B1::aa1] [@vm.inferred-type.metadata=#lib::A1] #t1.{self::B1::aa1}.{self::A1::call}(#t2, #t3, #t4, #t5, #t6);
   self::ok = false;
   [@vm.direct-call.metadata=#lib::T1::doTest1??] [@vm.inferred-type.metadata=!? (skip check)] [@vm.direct-call.metadata=#lib::A1::foo] [@vm.inferred-type.metadata=#lib::T1?] [@vm.direct-call.metadata=#lib::B1::aa1] [@vm.inferred-type.metadata=#lib::A1] bb.{self::B1::aa1}.{self::A1::foo}.{self::T1::doTest1}();
   exp::Expect::isTrue([@vm.inferred-type.metadata=dart.core::bool?] self::ok);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method test2() → void {
+static method test2() → void {
   self::B2* bb = new self::B2::•();
   [@vm.direct-call.metadata=#lib::B2::doSuperCall] [@vm.inferred-type.metadata=!? (skip check)] bb.{self::B2::doSuperCall}();
   self::ok = false;
   [@vm.direct-call.metadata=#lib::T2::doTest2??] [@vm.inferred-type.metadata=!? (receiver not int)] [@vm.direct-call.metadata=#lib::A2::foo] [@vm.inferred-type.metadata=#lib::T2? (receiver not int)] [@vm.direct-call.metadata=#lib::B2Base::aa2] [@vm.inferred-type.metadata=#lib::A2] bb.{self::B2Base::aa2}.foo.doTest2();
   exp::Expect::isTrue([@vm.inferred-type.metadata=dart.core::bool?] self::ok);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic3() → dynamic
+static method getDynamic3() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown3.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method test3() → void {
+static method test3() → void {
   self::getDynamic3().aa3(1, 2, 3, 4, 5, 6, new self::T3::•());
   self::ok = false;
   [@vm.direct-call.metadata=#lib::T3::doTest3??] [@vm.inferred-type.metadata=!? (receiver not int)] [@vm.direct-call.metadata=#lib::A3::foo] [@vm.inferred-type.metadata=#lib::T3? (receiver not int)] [@vm.direct-call.metadata=#lib::B3::aa3??] [@vm.inferred-type.metadata=#lib::A3 (receiver not int)] [@vm.inferred-type.metadata=#lib::B3?] self::bb3.aa3.foo.doTest3();
   exp::Expect::isTrue([@vm.inferred-type.metadata=dart.core::bool?] self::ok);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method getDynamic4() → dynamic
+static method getDynamic4() → dynamic
   return [@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] self::unknown4.call();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method test4() → void {
+static method test4() → void {
   self::getDynamic4().aa4(1, 2, 3, 4, 5, 6, 7, new self::T4::•());
   self::ok = false;
   [@vm.direct-call.metadata=#lib::T4::doTest4??] [@vm.inferred-type.metadata=!? (receiver not int)] [@vm.direct-call.metadata=#lib::A4::foo] [@vm.inferred-type.metadata=#lib::T4? (receiver not int)] [@vm.inferred-type.metadata=#lib::A4] self::getDynamic4().aa4.foo.doTest4();
   exp::Expect::isTrue([@vm.inferred-type.metadata=dart.core::bool?] self::ok);
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → void {
+static method main() → void {
   self::test1();
   self::test2();
   self::test3();
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_dynamic_method.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_dynamic_method.dart.expect
index 9caa665..e3c2996 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_dynamic_method.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_dynamic_method.dart.expect
@@ -3,27 +3,27 @@
 import "dart:core" as core;
 
 abstract class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
 }
 class B extends self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super self::A::•()
     ;
-[@vm.procedure-attributes.metadata=hasThisUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → core::int*
+[@vm.procedure-attributes.metadata=hasThisUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → core::int*
     return [@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=! (skip check)] 1.{core::num::+}([@vm.direct-call.metadata=#lib::B::foo] [@vm.inferred-type.metadata=!? (receiver not int)] [@vm.inferred-type.metadata=#lib::B] self::knownResult().foo() as{TypeError,ForDynamic} core::num*) as{TypeError} core::int*;
 }
 class TearOffDynamicMethod extends core::Object {
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  field dynamic bazz;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  constructor •(dynamic arg) → self::TearOffDynamicMethod*
+  constructor •(dynamic arg) → self::TearOffDynamicMethod*
     : self::TearOffDynamicMethod::bazz = arg.foo, super core::Object::•() {
     [@vm.call-site-attributes.metadata=receiverType:dynamic] [@vm.direct-call.metadata=#lib::TearOffDynamicMethod::bazz] this.{self::TearOffDynamicMethod::bazz}.call();
   }
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method knownResult() → dynamic
+static method knownResult() → dynamic
   return new self::B::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   core::Function* closure = () → self::B* => new self::B::•();
   new self::TearOffDynamicMethod::•([@vm.call-site-attributes.metadata=receiverType:dart.core::Function*] closure.call());
 }
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_interface_method.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_interface_method.dart.expect
index 94cf14a..48d30e5 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_interface_method.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_interface_method.dart.expect
@@ -4,28 +4,28 @@
 import "dart:_internal" as _in;
 
 abstract class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foo() → core::int*;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foo() → core::int*;
 }
 class B extends self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super self::A::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → core::int*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → core::int*
     return _in::unsafeCast<core::int*>([@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] 1.{core::num::+}(_in::unsafeCast<core::num*>([@vm.direct-call.metadata=#lib::B::bar] [@vm.inferred-type.metadata=dart.core::_Smi (value: 3) (receiver not int)] [@vm.inferred-type.metadata=#lib::B] self::knownResult().bar())));
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method bar() → core::int*
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method bar() → core::int*
     return 3;
 }
 class TearOffInterfaceMethod extends core::Object {
 [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  field dynamic bazz;
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  constructor •([@vm.inferred-type.metadata=#lib::B] self::A* arg) → self::TearOffInterfaceMethod*
+  constructor •([@vm.inferred-type.metadata=#lib::B] self::A* arg) → self::TearOffInterfaceMethod*
     : self::TearOffInterfaceMethod::bazz = arg.{self::A::foo}, super core::Object::•()
     ;
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method knownResult() → dynamic
+static method knownResult() → dynamic
   return new self::B::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   [@vm.call-site-attributes.metadata=receiverType:dynamic] [@vm.direct-call.metadata=#lib::TearOffInterfaceMethod::bazz] new self::TearOffInterfaceMethod::•(new self::B::•()).{self::TearOffInterfaceMethod::bazz}.call();
 }
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_super_method.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_super_method.dart.expect
index 7c51147..557d8ea 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_super_method.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/tear_off_super_method.dart.expect
@@ -4,38 +4,38 @@
 import "dart:_internal" as _in;
 
 abstract class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  abstract method foo() → core::int*;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method foo() → core::int*;
 }
 class B extends self::A {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super self::A::•()
     ;
-[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → core::int*
+[@vm.procedure-attributes.metadata=getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → core::int*
     return _in::unsafeCast<core::int*>([@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] 1.{core::num::+}(_in::unsafeCast<core::num*>([@vm.direct-call.metadata=#lib::B::foo] [@vm.inferred-type.metadata=int? (receiver not int)] [@vm.inferred-type.metadata=#lib::B] self::knownResult().foo())));
 }
 abstract class Base extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::Base*
+  synthetic constructor •() → self::Base*
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method foo() → core::int*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method foo() → core::int*
     return _in::unsafeCast<core::int*>([@vm.direct-call.metadata=dart.core::_IntegerImplementation::+] [@vm.inferred-type.metadata=int (skip check)] 3.{core::num::+}(_in::unsafeCast<core::num*>([@vm.direct-call.metadata=#lib::B::foo] [@vm.inferred-type.metadata=int? (receiver not int)] [@vm.inferred-type.metadata=#lib::B] self::knownResult().foo())));
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method doCall(dynamic x) → core::int*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  method doCall(dynamic x) → core::int*
     return [@vm.call-site-attributes.metadata=receiverType:dynamic] x.call() as{TypeError,ForDynamic} core::int*;
 }
 class TearOffSuperMethod extends self::Base {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::TearOffSuperMethod*
+  synthetic constructor •() → self::TearOffSuperMethod*
     : super self::Base::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  method bar() → core::int*
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  method bar() → core::int*
     return [@vm.direct-call.metadata=#lib::Base::doCall] [@vm.inferred-type.metadata=int? (skip check)] this.{self::Base::doCall}(super.{self::Base::foo});
 }
 [@vm.inferred-type.metadata=#lib::B?]static field self::A* aa = new self::B::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method knownResult() → dynamic
+static method knownResult() → dynamic
   return new self::B::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   [@vm.direct-call.metadata=#lib::TearOffSuperMethod::bar] [@vm.inferred-type.metadata=!? (skip check)] new self::TearOffSuperMethod::•().{self::TearOffSuperMethod::bar}();
   [@vm.direct-call.metadata=#lib::B::foo??] [@vm.inferred-type.metadata=!? (skip check)] [@vm.inferred-type.metadata=#lib::B?] self::aa.{self::A::foo}();
 }
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_fields.dart b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_fields.dart
new file mode 100644
index 0000000..8ab5bc9
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_fields.dart
@@ -0,0 +1,68 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+final bool kTrue = int.parse('1') == 1 ? true : false;
+final bool kFalse = int.parse('1') == 2 ? true : false;
+int get mint => 0xaabbccddaabbccdd;
+int get smiOrMint => kTrue ? 1 : mint;
+
+class X {}
+
+class A {
+  dynamic unboxedSmi;
+  dynamic unboxedInt;
+  dynamic unboxedDouble;
+  dynamic boxedNullableInt;
+  dynamic boxedNullableDouble;
+  dynamic boxedNonNullableIntOrDouble;
+  dynamic boxedNullableIntOrDouble;
+  dynamic boxedNullableX;
+  dynamic boxedX;
+
+  A(
+      this.unboxedSmi,
+      this.unboxedInt,
+      this.unboxedDouble,
+      this.boxedNullableInt,
+      this.boxedNullableDouble,
+      this.boxedNonNullableIntOrDouble,
+      this.boxedNullableIntOrDouble,
+      this.boxedNullableX,
+      this.boxedX);
+}
+
+main() {
+  final a = A(
+      kTrue ? 1 : 2,
+      kTrue ? smiOrMint : 2,
+      kTrue ? 1.1 : 2.2,
+      kTrue ? smiOrMint : null,
+      kTrue ? 1.1 : null,
+      kTrue ? smiOrMint : 1.1,
+      kTrue ? (kFalse ? smiOrMint : 1.1) : null,
+      kTrue ? X() : null,
+      X());
+
+  a.unboxedSmi = kTrue ? 1 : 2;
+  a.unboxedInt = kTrue ? smiOrMint : 2;
+  a.unboxedDouble = kTrue ? 1.1 : 2.2;
+  a.boxedNullableInt = kTrue ? smiOrMint : null;
+  a.boxedNullableDouble = kTrue ? 1.1 : null;
+  a.boxedNonNullableIntOrDouble = kTrue ? smiOrMint : 1.1;
+  a.boxedNullableIntOrDouble = kTrue ? (kFalse ? smiOrMint : 1.1) : null;
+  a.boxedNullableX = kTrue ? X() : null;
+  a.boxedX = X();
+
+  use(a.unboxedSmi);
+  use(a.unboxedInt);
+  use(a.unboxedDouble);
+  use(a.boxedNullableInt);
+  use(a.boxedNullableDouble);
+  use(a.boxedNonNullableIntOrDouble);
+  use(a.boxedNullableIntOrDouble);
+  use(a.boxedNullableX);
+  use(a.boxedX);
+}
+
+void use(dynamic object) {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_fields.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_fields.dart.expect
new file mode 100644
index 0000000..c1061c9
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_fields.dart.expect
@@ -0,0 +1,51 @@
+library #lib;
+import self as self;
+import "dart:core" as core;
+
+class X extends core::Object {
+  synthetic constructor •() → self::X*
+    : super core::Object::•()
+    ;
+}
+class A extends core::Object {
+[@vm.inferred-type.metadata=dart.core::_Smi] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  field dynamic unboxedSmi;
+[@vm.inferred-type.metadata=int] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4]  field dynamic unboxedInt;
+[@vm.inferred-type.metadata=dart.core::_Double] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6]  field dynamic unboxedDouble;
+[@vm.inferred-type.metadata=int?] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8]  field dynamic boxedNullableInt;
+[@vm.inferred-type.metadata=dart.core::_Double?] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  field dynamic boxedNullableDouble;
+[@vm.inferred-type.metadata=!] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  field dynamic boxedNonNullableIntOrDouble;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  field dynamic boxedNullableIntOrDouble;
+[@vm.inferred-type.metadata=#lib::X?] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  field dynamic boxedNullableX;
+[@vm.inferred-type.metadata=#lib::X] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  field dynamic boxedX;
+[@vm.unboxing-info.metadata=(i,i,d,b,b,b,b,b,b)->b]  constructor •([@vm.inferred-type.metadata=dart.core::_Smi] dynamic unboxedSmi, [@vm.inferred-type.metadata=int] dynamic unboxedInt, [@vm.inferred-type.metadata=dart.core::_Double] dynamic unboxedDouble, [@vm.inferred-type.metadata=int?] dynamic boxedNullableInt, [@vm.inferred-type.metadata=dart.core::_Double?] dynamic boxedNullableDouble, [@vm.inferred-type.metadata=!] dynamic boxedNonNullableIntOrDouble, dynamic boxedNullableIntOrDouble, [@vm.inferred-type.metadata=#lib::X?] dynamic boxedNullableX, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX) → self::A*
+    : self::A::unboxedSmi = unboxedSmi, self::A::unboxedInt = unboxedInt, self::A::unboxedDouble = unboxedDouble, self::A::boxedNullableInt = boxedNullableInt, self::A::boxedNullableDouble = boxedNullableDouble, self::A::boxedNonNullableIntOrDouble = boxedNonNullableIntOrDouble, self::A::boxedNullableIntOrDouble = boxedNullableIntOrDouble, self::A::boxedNullableX = boxedNullableX, self::A::boxedX = boxedX, super core::Object::•()
+    ;
+}
+[@vm.inferred-type.metadata=dart.core::bool?]static final field core::bool* kTrue = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::==] [@vm.inferred-type.metadata=dart.core::bool (skip check)] [@vm.inferred-type.metadata=int] core::int::parse("1").{core::num::==}(1) ?{core::bool*} true : false;
+[@vm.inferred-type.metadata=dart.core::bool?]static final field core::bool* kFalse = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::==] [@vm.inferred-type.metadata=dart.core::bool (skip check)] [@vm.inferred-type.metadata=int] core::int::parse("1").{core::num::==}(2) ?{core::bool*} true : false;
+static get mint() → core::int*
+  return -6144092014192636707;
+static get smiOrMint() → core::int*
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : [@vm.inferred-type.metadata=int] self::mint;
+static method main() → dynamic {
+  final self::A* a = new self::A::•([@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null, new self::X::•());
+  [@vm.direct-call.metadata=#lib::A::unboxedSmi] [@vm.inferred-type.metadata=!? (skip check)] a.{self::A::unboxedSmi} = [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2;
+  [@vm.direct-call.metadata=#lib::A::unboxedInt] [@vm.inferred-type.metadata=!? (skip check)] a.{self::A::unboxedInt} = [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2;
+  [@vm.direct-call.metadata=#lib::A::unboxedDouble] [@vm.inferred-type.metadata=!? (skip check)] a.{self::A::unboxedDouble} = [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2;
+  [@vm.direct-call.metadata=#lib::A::boxedNullableInt] [@vm.inferred-type.metadata=!? (skip check)] a.{self::A::boxedNullableInt} = [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null;
+  [@vm.direct-call.metadata=#lib::A::boxedNullableDouble] [@vm.inferred-type.metadata=!? (skip check)] a.{self::A::boxedNullableDouble} = [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null;
+  [@vm.direct-call.metadata=#lib::A::boxedNonNullableIntOrDouble] [@vm.inferred-type.metadata=!? (skip check)] a.{self::A::boxedNonNullableIntOrDouble} = [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1;
+  [@vm.direct-call.metadata=#lib::A::boxedNullableIntOrDouble] [@vm.inferred-type.metadata=!? (skip check)] a.{self::A::boxedNullableIntOrDouble} = [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null;
+  [@vm.direct-call.metadata=#lib::A::boxedNullableX] [@vm.inferred-type.metadata=!? (skip check)] a.{self::A::boxedNullableX} = [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null;
+  [@vm.direct-call.metadata=#lib::A::boxedX] [@vm.inferred-type.metadata=!? (skip check)] a.{self::A::boxedX} = new self::X::•();
+  self::use([@vm.direct-call.metadata=#lib::A::unboxedSmi] [@vm.inferred-type.metadata=dart.core::_Smi] a.{self::A::unboxedSmi});
+  self::use([@vm.direct-call.metadata=#lib::A::unboxedInt] [@vm.inferred-type.metadata=int] a.{self::A::unboxedInt});
+  self::use([@vm.direct-call.metadata=#lib::A::unboxedDouble] [@vm.inferred-type.metadata=dart.core::_Double] a.{self::A::unboxedDouble});
+  self::use([@vm.direct-call.metadata=#lib::A::boxedNullableInt] [@vm.inferred-type.metadata=int?] a.{self::A::boxedNullableInt});
+  self::use([@vm.direct-call.metadata=#lib::A::boxedNullableDouble] [@vm.inferred-type.metadata=dart.core::_Double?] a.{self::A::boxedNullableDouble});
+  self::use([@vm.direct-call.metadata=#lib::A::boxedNonNullableIntOrDouble] [@vm.inferred-type.metadata=!] a.{self::A::boxedNonNullableIntOrDouble});
+  self::use([@vm.direct-call.metadata=#lib::A::boxedNullableIntOrDouble] a.{self::A::boxedNullableIntOrDouble});
+  self::use([@vm.direct-call.metadata=#lib::A::boxedNullableX] [@vm.inferred-type.metadata=#lib::X?] a.{self::A::boxedNullableX});
+  self::use([@vm.direct-call.metadata=#lib::A::boxedX] [@vm.inferred-type.metadata=#lib::X] a.{self::A::boxedX});
+}
+static method use(dynamic object) → void {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method.dart b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method.dart
new file mode 100644
index 0000000..bf63d64
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method.dart
@@ -0,0 +1,158 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+final bool kTrue = int.parse('1') == 1 ? true : false;
+final bool kFalse = int.parse('1') == 2 ? true : false;
+int get mint => 0xaabbccddaabbccdd;
+int get smiOrMint => kTrue ? 1 : mint;
+
+class X {}
+
+abstract class Interface {
+  void takePositional(
+      int unboxedSmi,
+      dynamic unboxedInt,
+      dynamic unboxedDouble,
+      dynamic boxedNullableInt,
+      dynamic boxedNullableDouble,
+      dynamic boxedNonNullableIntOrDouble,
+      dynamic boxedNullableIntOrDouble,
+      dynamic boxedNullableX,
+      dynamic boxedX);
+
+  dynamic returnUnboxedSmi(X ignored);
+  dynamic returnUnboxedInt(X ignored);
+  dynamic returnUnboxedDouble(X ignored);
+  dynamic returnBoxedNullableInt(X ignored);
+  dynamic returnBoxedNullableDouble(X ignored);
+  dynamic returnBoxedIntOrDouble(X ignored);
+  dynamic returnBoxedNullableIntOrDouble(X ignored);
+  dynamic returnBoxedNullableX(X ignored);
+  dynamic returnBoxedX(X ignored);
+}
+
+class Impl1 implements Interface {
+  void takePositional(
+      int unboxedSmi,
+      dynamic unboxedInt,
+      dynamic unboxedDouble,
+      dynamic boxedNullableInt,
+      dynamic boxedNullableDouble,
+      dynamic boxedNonNullableIntOrDouble,
+      dynamic boxedNullableIntOrDouble,
+      dynamic boxedNullableX,
+      dynamic boxedX) {}
+
+  dynamic returnUnboxedSmi(X ignored) => 1;
+  dynamic returnUnboxedInt(X ignored) => 1;
+  dynamic returnUnboxedDouble(X ignored) => 1.1;
+  dynamic returnBoxedNullableInt(X ignored) => null;
+  dynamic returnBoxedNullableDouble(X ignored) => null;
+  dynamic returnBoxedIntOrDouble(X ignored) => 1;
+  dynamic returnBoxedNullableIntOrDouble(X ignored) => null;
+  dynamic returnBoxedNullableX(X ignored) => null;
+  dynamic returnBoxedX(X ignored) => X();
+}
+
+class BaseImpl2 {
+  void takePositional(
+      int unboxedSmi,
+      dynamic unboxedInt,
+      dynamic unboxedDouble,
+      dynamic boxedNullableInt,
+      dynamic boxedNullableDouble,
+      dynamic boxedNonNullableIntOrDouble,
+      dynamic boxedNullableIntOrDouble,
+      dynamic boxedNullableX,
+      dynamic boxedX) {}
+
+  dynamic returnUnboxedSmi(X ignored) => 2;
+  dynamic returnUnboxedInt(X ignored) => mint;
+  dynamic returnUnboxedDouble(X ignored) => 2.2;
+  dynamic returnBoxedNullableInt(X ignored) => 2;
+  dynamic returnBoxedNullableDouble(X ignored) => 2.2;
+  dynamic returnBoxedIntOrDouble(X ignored) => 2.2;
+  dynamic returnBoxedNullableIntOrDouble(X ignored) => 2;
+  dynamic returnBoxedNullableX(X ignored) => X();
+  dynamic returnBoxedX(X ignored) => X();
+}
+
+class SubImpl3 extends BaseImpl2 implements Interface {
+  void takePositional(
+      int unboxedSmi,
+      dynamic unboxedInt,
+      dynamic unboxedDouble,
+      dynamic boxedNullableInt,
+      dynamic boxedNullableDouble,
+      dynamic boxedNonNullableIntOrDouble,
+      dynamic boxedNullableIntOrDouble,
+      dynamic boxedNullableX,
+      dynamic boxedX) {}
+
+  dynamic returnUnboxedSmi(X ignored) => 3;
+  dynamic returnUnboxedInt(X ignored) => mint;
+  dynamic returnUnboxedDouble(X ignored) => 3.3;
+  dynamic returnBoxedNullableInt(X ignored) => mint;
+  dynamic returnBoxedNullableDouble(X ignored) => 3.3;
+  dynamic returnBoxedIntOrDouble(X ignored) => 3.3;
+  dynamic returnBoxedNullableIntOrDouble(X ignored) => 3.3;
+  dynamic returnBoxedNullableX(X ignored) => X();
+  dynamic returnBoxedX(X ignored) => X();
+}
+
+main() {
+  final values = [Impl1(), BaseImpl2(), SubImpl3()];
+
+  final a = values[int.parse('0')] as Impl1;
+  final b = values[int.parse('1')] as BaseImpl2;
+  final c = values[int.parse('2')] as SubImpl3;
+  final d = values[int.parse('2')] as Interface;
+
+  a.takePositional(1, 1, 1.1, null, null, 1, null, null, X());
+  b.takePositional(2, 2, 2.2, 2, 2.2, 2.2, 2, X(), X());
+  c.takePositional(3, mint, 3.3, mint, 3.3, 3.3, 3.3, X(), X());
+  d.takePositional(3, mint, 3.3, mint, 3.3, 3.3, 3.3, X(), X());
+
+  use(a.returnUnboxedSmi(null));
+  use(a.returnUnboxedInt(null));
+  use(a.returnUnboxedDouble(null));
+  use(a.returnBoxedNullableInt(null));
+  use(a.returnBoxedNullableDouble(null));
+  use(a.returnBoxedIntOrDouble(null));
+  use(a.returnBoxedNullableIntOrDouble(null));
+  use(a.returnBoxedNullableX(null));
+  use(a.returnBoxedX(null));
+
+  use(b.returnUnboxedSmi(null));
+  use(b.returnUnboxedInt(null));
+  use(b.returnUnboxedDouble(null));
+  use(b.returnBoxedNullableInt(null));
+  use(b.returnBoxedNullableDouble(null));
+  use(b.returnBoxedIntOrDouble(null));
+  use(b.returnBoxedNullableIntOrDouble(null));
+  use(b.returnBoxedNullableX(null));
+  use(b.returnBoxedX(null));
+
+  use(c.returnUnboxedSmi(null));
+  use(c.returnUnboxedInt(null));
+  use(c.returnUnboxedDouble(null));
+  use(c.returnBoxedNullableInt(null));
+  use(c.returnBoxedNullableDouble(null));
+  use(c.returnBoxedIntOrDouble(null));
+  use(c.returnBoxedNullableIntOrDouble(null));
+  use(c.returnBoxedNullableX(null));
+  use(c.returnBoxedX(null));
+
+  use(d.returnUnboxedSmi(null));
+  use(d.returnUnboxedInt(null));
+  use(d.returnUnboxedDouble(null));
+  use(d.returnBoxedNullableInt(null));
+  use(d.returnBoxedNullableDouble(null));
+  use(d.returnBoxedIntOrDouble(null));
+  use(d.returnBoxedNullableIntOrDouble(null));
+  use(d.returnBoxedNullableX(null));
+  use(d.returnBoxedX(null));
+}
+
+void use(dynamic value) {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method.dart.expect
new file mode 100644
index 0000000..e57a95f
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method.dart.expect
@@ -0,0 +1,143 @@
+library #lib;
+import self as self;
+import "dart:core" as core;
+
+class X extends core::Object {
+  synthetic constructor •() → self::X*
+    : super core::Object::•()
+    ;
+}
+abstract class Interface extends core::Object {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=(i,i,d,b,b,b,b,b,b)->b]  abstract method takePositional(core::int* unboxedSmi, dynamic unboxedInt, dynamic unboxedDouble, dynamic boxedNullableInt, dynamic boxedNullableDouble, dynamic boxedNonNullableIntOrDouble, dynamic boxedNullableIntOrDouble, dynamic boxedNullableX, dynamic boxedX) → void;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=(b)->i]  abstract method returnUnboxedSmi(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=(b)->i]  abstract method returnUnboxedInt(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=(b)->d]  abstract method returnUnboxedDouble(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  abstract method returnBoxedNullableInt(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  abstract method returnBoxedNullableDouble(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  abstract method returnBoxedIntOrDouble(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  abstract method returnBoxedNullableIntOrDouble(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  abstract method returnBoxedNullableX(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:19,getterSelectorId:20]  abstract method returnBoxedX(self::X* ignored) → dynamic;
+}
+class Impl1 extends core::Object implements self::Interface {
+  synthetic constructor •() → self::Impl1*
+    : super core::Object::•()
+    ;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=(i,i,d,b,b,b,b,b,b)->b]  method takePositional([@vm.inferred-type.metadata=dart.core::_Smi] core::int* unboxedSmi, [@vm.inferred-type.metadata=int] dynamic unboxedInt, [@vm.inferred-type.metadata=dart.core::_Double] dynamic unboxedDouble, [@vm.inferred-type.metadata=int?] dynamic boxedNullableInt, [@vm.inferred-type.metadata=dart.core::_Double?] dynamic boxedNullableDouble, [@vm.inferred-type.metadata=!] dynamic boxedNonNullableIntOrDouble, [@vm.inferred-type.metadata=dart.core::_Double?] dynamic boxedNullableIntOrDouble, [@vm.inferred-type.metadata=#lib::X?] dynamic boxedNullableX, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX) → void {}
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedSmi([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 1;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedInt([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 1;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=(b)->d]  method returnUnboxedDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 1.1;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method returnBoxedNullableInt([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return null;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method returnBoxedNullableDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return null;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  method returnBoxedIntOrDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 1;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  method returnBoxedNullableIntOrDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return null;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  method returnBoxedNullableX([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return null;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:19,getterSelectorId:20]  method returnBoxedX([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return new self::X::•();
+}
+class BaseImpl2 extends core::Object {
+  synthetic constructor •() → self::BaseImpl2*
+    : super core::Object::•()
+    ;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=(i,i,d,b,b,b,b,b,b)->b]  method takePositional([@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] core::int* unboxedSmi, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic unboxedInt, [@vm.inferred-type.metadata=dart.core::_Double (value: 2.2)] dynamic unboxedDouble, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic boxedNullableInt, [@vm.inferred-type.metadata=dart.core::_Double (value: 2.2)] dynamic boxedNullableDouble, [@vm.inferred-type.metadata=dart.core::_Double (value: 2.2)] dynamic boxedNonNullableIntOrDouble, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic boxedNullableIntOrDouble, [@vm.inferred-type.metadata=#lib::X] dynamic boxedNullableX, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX) → void {}
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedSmi([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedInt([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return [@vm.inferred-type.metadata=int] self::mint;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=(b)->d]  method returnUnboxedDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2.2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method returnBoxedNullableInt([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method returnBoxedNullableDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2.2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  method returnBoxedIntOrDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2.2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  method returnBoxedNullableIntOrDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  method returnBoxedNullableX([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return new self::X::•();
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:19,getterSelectorId:20]  method returnBoxedX([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return new self::X::•();
+}
+class SubImpl3 extends self::BaseImpl2 implements self::Interface {
+  synthetic constructor •() → self::SubImpl3*
+    : super self::BaseImpl2::•()
+    ;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2] [@vm.unboxing-info.metadata=(i,i,d,b,b,b,b,b,b)->b]  method takePositional([@vm.inferred-type.metadata=dart.core::_Smi] core::int* unboxedSmi, [@vm.inferred-type.metadata=int] dynamic unboxedInt, [@vm.inferred-type.metadata=dart.core::_Double] dynamic unboxedDouble, [@vm.inferred-type.metadata=int] dynamic boxedNullableInt, [@vm.inferred-type.metadata=dart.core::_Double] dynamic boxedNullableDouble, [@vm.inferred-type.metadata=dart.core::_Double] dynamic boxedNonNullableIntOrDouble, [@vm.inferred-type.metadata=!] dynamic boxedNullableIntOrDouble, [@vm.inferred-type.metadata=#lib::X] dynamic boxedNullableX, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX) → void {}
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedSmi([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedInt([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return [@vm.inferred-type.metadata=int] self::mint;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=(b)->d]  method returnUnboxedDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 3.3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method returnBoxedNullableInt([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return [@vm.inferred-type.metadata=int] self::mint;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method returnBoxedNullableDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 3.3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  method returnBoxedIntOrDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 3.3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  method returnBoxedNullableIntOrDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 3.3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  method returnBoxedNullableX([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return new self::X::•();
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:19,getterSelectorId:20]  method returnBoxedX([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return new self::X::•();
+}
+static get mint() → core::int*
+  return -6144092014192636707;
+static method main() → dynamic {
+  final core::List<core::Object*>* values = <core::Object*>[new self::Impl1::•(), new self::BaseImpl2::•(), new self::SubImpl3::•()];
+  final self::Impl1* a = [@vm.direct-call.metadata=dart.core::_GrowableList::[]] [@vm.inferred-type.metadata=!? (skip check)] values.{core::List::[]}([@vm.inferred-type.metadata=int] core::int::parse("0")) as self::Impl1*;
+  final self::BaseImpl2* b = [@vm.direct-call.metadata=dart.core::_GrowableList::[]] [@vm.inferred-type.metadata=!? (skip check)] values.{core::List::[]}([@vm.inferred-type.metadata=int] core::int::parse("1")) as self::BaseImpl2*;
+  final self::SubImpl3* c = [@vm.direct-call.metadata=dart.core::_GrowableList::[]] [@vm.inferred-type.metadata=!? (skip check)] values.{core::List::[]}([@vm.inferred-type.metadata=int] core::int::parse("2")) as self::SubImpl3*;
+  final self::Interface* d = [@vm.direct-call.metadata=dart.core::_GrowableList::[]] [@vm.inferred-type.metadata=!? (skip check)] values.{core::List::[]}([@vm.inferred-type.metadata=int] core::int::parse("2")) as self::Interface*;
+  [@vm.direct-call.metadata=#lib::Impl1::takePositional??] [@vm.inferred-type.metadata=!? (skip check)] a.{self::Impl1::takePositional}(1, 1, 1.1, null, null, 1, null, null, new self::X::•());
+  b.{self::BaseImpl2::takePositional}(2, 2, 2.2, 2, 2.2, 2.2, 2, new self::X::•(), new self::X::•());
+  [@vm.direct-call.metadata=#lib::SubImpl3::takePositional??] [@vm.inferred-type.metadata=!? (skip check)] c.{self::SubImpl3::takePositional}(3, [@vm.inferred-type.metadata=int] self::mint, 3.3, [@vm.inferred-type.metadata=int] self::mint, 3.3, 3.3, 3.3, new self::X::•(), new self::X::•());
+  d.{self::Interface::takePositional}(3, [@vm.inferred-type.metadata=int] self::mint, 3.3, [@vm.inferred-type.metadata=int] self::mint, 3.3, 3.3, 3.3, new self::X::•(), new self::X::•());
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnUnboxedSmi] [@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 1)] a.{self::Impl1::returnUnboxedSmi}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnUnboxedInt] [@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 1)] a.{self::Impl1::returnUnboxedInt}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnUnboxedDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 1.1)] a.{self::Impl1::returnUnboxedDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedNullableInt] [@vm.inferred-type.metadata=dart.core::Null? (skip check) (value: null)] a.{self::Impl1::returnBoxedNullableInt}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedNullableDouble] [@vm.inferred-type.metadata=dart.core::Null? (skip check) (value: null)] a.{self::Impl1::returnBoxedNullableDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedIntOrDouble] [@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 1)] a.{self::Impl1::returnBoxedIntOrDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedNullableIntOrDouble] [@vm.inferred-type.metadata=dart.core::Null? (skip check) (value: null)] a.{self::Impl1::returnBoxedNullableIntOrDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedNullableX] [@vm.inferred-type.metadata=dart.core::Null? (skip check) (value: null)] a.{self::Impl1::returnBoxedNullableX}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedX] [@vm.inferred-type.metadata=#lib::X (skip check)] a.{self::Impl1::returnBoxedX}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Smi] b.{self::BaseImpl2::returnUnboxedSmi}(null));
+  self::use([@vm.inferred-type.metadata=int] b.{self::BaseImpl2::returnUnboxedInt}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] b.{self::BaseImpl2::returnUnboxedDouble}(null));
+  self::use([@vm.inferred-type.metadata=int] b.{self::BaseImpl2::returnBoxedNullableInt}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] b.{self::BaseImpl2::returnBoxedNullableDouble}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] b.{self::BaseImpl2::returnBoxedIntOrDouble}(null));
+  self::use([@vm.inferred-type.metadata=!] b.{self::BaseImpl2::returnBoxedNullableIntOrDouble}(null));
+  self::use([@vm.inferred-type.metadata=#lib::X] b.{self::BaseImpl2::returnBoxedNullableX}(null));
+  self::use([@vm.inferred-type.metadata=#lib::X] b.{self::BaseImpl2::returnBoxedX}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnUnboxedSmi] [@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 3)] c.{self::SubImpl3::returnUnboxedSmi}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnUnboxedInt] [@vm.inferred-type.metadata=int (skip check)] c.{self::SubImpl3::returnUnboxedInt}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnUnboxedDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.3)] c.{self::SubImpl3::returnUnboxedDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedNullableInt] [@vm.inferred-type.metadata=int (skip check)] c.{self::SubImpl3::returnBoxedNullableInt}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedNullableDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.3)] c.{self::SubImpl3::returnBoxedNullableDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedIntOrDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.3)] c.{self::SubImpl3::returnBoxedIntOrDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedNullableIntOrDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.3)] c.{self::SubImpl3::returnBoxedNullableIntOrDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedNullableX] [@vm.inferred-type.metadata=#lib::X (skip check)] c.{self::SubImpl3::returnBoxedNullableX}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedX] [@vm.inferred-type.metadata=#lib::X (skip check)] c.{self::SubImpl3::returnBoxedX}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Smi] d.{self::Interface::returnUnboxedSmi}(null));
+  self::use([@vm.inferred-type.metadata=int] d.{self::Interface::returnUnboxedInt}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] d.{self::Interface::returnUnboxedDouble}(null));
+  self::use([@vm.inferred-type.metadata=int?] d.{self::Interface::returnBoxedNullableInt}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double?] d.{self::Interface::returnBoxedNullableDouble}(null));
+  self::use([@vm.inferred-type.metadata=!] d.{self::Interface::returnBoxedIntOrDouble}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double?] d.{self::Interface::returnBoxedNullableIntOrDouble}(null));
+  self::use([@vm.inferred-type.metadata=#lib::X?] d.{self::Interface::returnBoxedNullableX}(null));
+  self::use([@vm.inferred-type.metadata=#lib::X] d.{self::Interface::returnBoxedX}(null));
+}
+static method use(dynamic value) → void {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method_tearoff.dart b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method_tearoff.dart
new file mode 100644
index 0000000..fa87b74
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method_tearoff.dart
@@ -0,0 +1,170 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+final bool kTrue = int.parse('1') == 1 ? true : false;
+final bool kFalse = int.parse('1') == 2 ? true : false;
+int get mint => 0xaabbccddaabbccdd;
+int get smiOrMint => kTrue ? 1 : mint;
+
+class X {}
+
+abstract class Interface {
+  void takePositional(
+      int unboxedSmi,
+      dynamic unboxedInt,
+      dynamic unboxedDouble,
+      dynamic boxedNullableInt,
+      dynamic boxedNullableDouble,
+      dynamic boxedNonNullableIntOrDouble,
+      dynamic boxedNullableIntOrDouble,
+      dynamic boxedNullableX,
+      dynamic boxedX);
+
+  dynamic returnUnboxedSmi(X ignored);
+  dynamic returnUnboxedInt(X ignored);
+  dynamic returnUnboxedDouble(X ignored);
+  dynamic returnBoxedNullableInt(X ignored);
+  dynamic returnBoxedNullableDouble(X ignored);
+  dynamic returnBoxedIntOrDouble(X ignored);
+  dynamic returnBoxedNullableIntOrDouble(X ignored);
+  dynamic returnBoxedNullableX(X ignored);
+  dynamic returnBoxedX(X ignored);
+}
+
+class Impl1 implements Interface {
+  void takePositional(
+      int unboxedSmi,
+      dynamic unboxedInt,
+      dynamic unboxedDouble,
+      dynamic boxedNullableInt,
+      dynamic boxedNullableDouble,
+      dynamic boxedNonNullableIntOrDouble,
+      dynamic boxedNullableIntOrDouble,
+      dynamic boxedNullableX,
+      dynamic boxedX) {}
+
+  dynamic returnUnboxedSmi(X ignored) => 1;
+  dynamic returnUnboxedInt(X ignored) => 1;
+  dynamic returnUnboxedDouble(X ignored) => 1.1;
+  dynamic returnBoxedNullableInt(X ignored) => null;
+  dynamic returnBoxedNullableDouble(X ignored) => null;
+  dynamic returnBoxedIntOrDouble(X ignored) => 1;
+  dynamic returnBoxedNullableIntOrDouble(X ignored) => null;
+  dynamic returnBoxedNullableX(X ignored) => null;
+  dynamic returnBoxedX(X ignored) => X();
+}
+
+class BaseImpl2 {
+  void takePositional(
+      int unboxedSmi,
+      dynamic unboxedInt,
+      dynamic unboxedDouble,
+      dynamic boxedNullableInt,
+      dynamic boxedNullableDouble,
+      dynamic boxedNonNullableIntOrDouble,
+      dynamic boxedNullableIntOrDouble,
+      dynamic boxedNullableX,
+      dynamic boxedX) {}
+
+  dynamic returnUnboxedSmi(X ignored) => 2;
+  dynamic returnUnboxedInt(X ignored) => mint;
+  dynamic returnUnboxedDouble(X ignored) => 2.2;
+  dynamic returnBoxedNullableInt(X ignored) => 2;
+  dynamic returnBoxedNullableDouble(X ignored) => 2.2;
+  dynamic returnBoxedIntOrDouble(X ignored) => 2.2;
+  dynamic returnBoxedNullableIntOrDouble(X ignored) => 2;
+  dynamic returnBoxedNullableX(X ignored) => X();
+  dynamic returnBoxedX(X ignored) => X();
+}
+
+class SubImpl3 extends BaseImpl2 implements Interface {
+  void takePositional(
+      int unboxedSmi,
+      dynamic unboxedInt,
+      dynamic unboxedDouble,
+      dynamic boxedNullableInt,
+      dynamic boxedNullableDouble,
+      dynamic boxedNonNullableIntOrDouble,
+      dynamic boxedNullableIntOrDouble,
+      dynamic boxedNullableX,
+      dynamic boxedX) {}
+
+  dynamic returnUnboxedSmi(X ignored) => 3;
+  dynamic returnUnboxedInt(X ignored) => mint;
+  dynamic returnUnboxedDouble(X ignored) => 3.3;
+  dynamic returnBoxedNullableInt(X ignored) => mint;
+  dynamic returnBoxedNullableDouble(X ignored) => 3.3;
+  dynamic returnBoxedIntOrDouble(X ignored) => 3.3;
+  dynamic returnBoxedNullableIntOrDouble(X ignored) => 3.3;
+  dynamic returnBoxedNullableX(X ignored) => X();
+  dynamic returnBoxedX(X ignored) => X();
+}
+
+main() {
+  final values = [Impl1(), BaseImpl2(), SubImpl3()];
+
+  final a = values[int.parse('0')] as Impl1;
+  final b = values[int.parse('1')] as BaseImpl2;
+  final c = values[int.parse('2')] as SubImpl3;
+  final d = values[int.parse('2')] as Interface;
+
+  a.takePositional(1, 1, 1.1, null, null, 1, null, null, X());
+  b.takePositional(2, 2, 2.2, 2, 2.2, 2.2, 2, X(), X());
+  c.takePositional(3, mint, 3.3, mint, 3.3, 3.3, 3.3, X(), X());
+  d.takePositional(3, mint, 3.3, mint, 3.3, 3.3, 3.3, X(), X());
+
+  use(a.returnUnboxedSmi(null));
+  use(a.returnUnboxedInt(null));
+  use(a.returnUnboxedDouble(null));
+  use(a.returnBoxedNullableInt(null));
+  use(a.returnBoxedNullableDouble(null));
+  use(a.returnBoxedIntOrDouble(null));
+  use(a.returnBoxedNullableIntOrDouble(null));
+  use(a.returnBoxedNullableX(null));
+  use(a.returnBoxedX(null));
+
+  use(b.returnUnboxedSmi(null));
+  use(b.returnUnboxedInt(null));
+  use(b.returnUnboxedDouble(null));
+  use(b.returnBoxedNullableInt(null));
+  use(b.returnBoxedNullableDouble(null));
+  use(b.returnBoxedIntOrDouble(null));
+  use(b.returnBoxedNullableIntOrDouble(null));
+  use(b.returnBoxedNullableX(null));
+  use(b.returnBoxedX(null));
+
+  use(c.returnUnboxedSmi(null));
+  use(c.returnUnboxedInt(null));
+  use(c.returnUnboxedDouble(null));
+  use(c.returnBoxedNullableInt(null));
+  use(c.returnBoxedNullableDouble(null));
+  use(c.returnBoxedIntOrDouble(null));
+  use(c.returnBoxedNullableIntOrDouble(null));
+  use(c.returnBoxedNullableX(null));
+  use(c.returnBoxedX(null));
+
+  use(d.returnUnboxedSmi(null));
+  use(d.returnUnboxedInt(null));
+  use(d.returnUnboxedDouble(null));
+  use(d.returnBoxedNullableInt(null));
+  use(d.returnBoxedNullableDouble(null));
+  use(d.returnBoxedIntOrDouble(null));
+  use(d.returnBoxedNullableIntOrDouble(null));
+  use(d.returnBoxedNullableX(null));
+  use(d.returnBoxedX(null));
+
+  // Use as tear-offs.
+  use(d.takePositional);
+  use(d.returnUnboxedSmi);
+  use(d.returnUnboxedInt);
+  use(d.returnUnboxedDouble);
+  use(d.returnBoxedNullableInt);
+  use(d.returnBoxedNullableDouble);
+  use(d.returnBoxedIntOrDouble);
+  use(d.returnBoxedNullableIntOrDouble);
+  use(d.returnBoxedNullableX);
+  use(d.returnBoxedX);
+}
+
+void use(dynamic value) {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method_tearoff.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method_tearoff.dart.expect
new file mode 100644
index 0000000..b08779a
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_instance_method_tearoff.dart.expect
@@ -0,0 +1,153 @@
+library #lib;
+import self as self;
+import "dart:core" as core;
+
+class X extends core::Object {
+  synthetic constructor •() → self::X*
+    : super core::Object::•()
+    ;
+}
+abstract class Interface extends core::Object {
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  abstract method takePositional(core::int* unboxedSmi, dynamic unboxedInt, dynamic unboxedDouble, dynamic boxedNullableInt, dynamic boxedNullableDouble, dynamic boxedNonNullableIntOrDouble, dynamic boxedNullableIntOrDouble, dynamic boxedNullableX, dynamic boxedX) → void;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=(b)->i]  abstract method returnUnboxedSmi(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=(b)->i]  abstract method returnUnboxedInt(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=(b)->d]  abstract method returnUnboxedDouble(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  abstract method returnBoxedNullableInt(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  abstract method returnBoxedNullableDouble(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  abstract method returnBoxedIntOrDouble(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  abstract method returnBoxedNullableIntOrDouble(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  abstract method returnBoxedNullableX(self::X* ignored) → dynamic;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasNonThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:19,getterSelectorId:20]  abstract method returnBoxedX(self::X* ignored) → dynamic;
+}
+class Impl1 extends core::Object implements self::Interface {
+  synthetic constructor •() → self::Impl1*
+    : super core::Object::•()
+    ;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method takePositional(core::int* unboxedSmi, dynamic unboxedInt, dynamic unboxedDouble, dynamic boxedNullableInt, dynamic boxedNullableDouble, dynamic boxedNonNullableIntOrDouble, dynamic boxedNullableIntOrDouble, dynamic boxedNullableX, dynamic boxedX) → void {}
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedSmi(self::X* ignored) → dynamic
+    return 1;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedInt(self::X* ignored) → dynamic
+    return 1;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=(b)->d]  method returnUnboxedDouble(self::X* ignored) → dynamic
+    return 1.1;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method returnBoxedNullableInt(self::X* ignored) → dynamic
+    return null;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method returnBoxedNullableDouble(self::X* ignored) → dynamic
+    return null;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  method returnBoxedIntOrDouble(self::X* ignored) → dynamic
+    return 1;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  method returnBoxedNullableIntOrDouble(self::X* ignored) → dynamic
+    return null;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  method returnBoxedNullableX(self::X* ignored) → dynamic
+    return null;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:19,getterSelectorId:20]  method returnBoxedX(self::X* ignored) → dynamic
+    return new self::X::•();
+}
+class BaseImpl2 extends core::Object {
+  synthetic constructor •() → self::BaseImpl2*
+    : super core::Object::•()
+    ;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method takePositional([@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] core::int* unboxedSmi, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic unboxedInt, [@vm.inferred-type.metadata=dart.core::_Double (value: 2.2)] dynamic unboxedDouble, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic boxedNullableInt, [@vm.inferred-type.metadata=dart.core::_Double (value: 2.2)] dynamic boxedNullableDouble, [@vm.inferred-type.metadata=dart.core::_Double (value: 2.2)] dynamic boxedNonNullableIntOrDouble, [@vm.inferred-type.metadata=dart.core::_Smi (value: 2)] dynamic boxedNullableIntOrDouble, [@vm.inferred-type.metadata=#lib::X] dynamic boxedNullableX, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX) → void {}
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedSmi([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedInt([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return [@vm.inferred-type.metadata=int] self::mint;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=(b)->d]  method returnUnboxedDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2.2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method returnBoxedNullableInt([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method returnBoxedNullableDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2.2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  method returnBoxedIntOrDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2.2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  method returnBoxedNullableIntOrDouble([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return 2;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  method returnBoxedNullableX([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return new self::X::•();
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:19,getterSelectorId:20]  method returnBoxedX([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::X* ignored) → dynamic
+    return new self::X::•();
+}
+class SubImpl3 extends self::BaseImpl2 implements self::Interface {
+  synthetic constructor •() → self::SubImpl3*
+    : super self::BaseImpl2::•()
+    ;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  method takePositional(core::int* unboxedSmi, dynamic unboxedInt, dynamic unboxedDouble, dynamic boxedNullableInt, dynamic boxedNullableDouble, dynamic boxedNonNullableIntOrDouble, dynamic boxedNullableIntOrDouble, dynamic boxedNullableX, dynamic boxedX) → void {}
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:3,getterSelectorId:4] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedSmi(self::X* ignored) → dynamic
+    return 3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:5,getterSelectorId:6] [@vm.unboxing-info.metadata=(b)->i]  method returnUnboxedInt(self::X* ignored) → dynamic
+    return [@vm.inferred-type.metadata=int] self::mint;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:7,getterSelectorId:8] [@vm.unboxing-info.metadata=(b)->d]  method returnUnboxedDouble(self::X* ignored) → dynamic
+    return 3.3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:9,getterSelectorId:10]  method returnBoxedNullableInt(self::X* ignored) → dynamic
+    return [@vm.inferred-type.metadata=int] self::mint;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:11,getterSelectorId:12]  method returnBoxedNullableDouble(self::X* ignored) → dynamic
+    return 3.3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:13,getterSelectorId:14]  method returnBoxedIntOrDouble(self::X* ignored) → dynamic
+    return 3.3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:15,getterSelectorId:16]  method returnBoxedNullableIntOrDouble(self::X* ignored) → dynamic
+    return 3.3;
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:17,getterSelectorId:18]  method returnBoxedNullableX(self::X* ignored) → dynamic
+    return new self::X::•();
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,methodOrSetterSelectorId:19,getterSelectorId:20]  method returnBoxedX(self::X* ignored) → dynamic
+    return new self::X::•();
+}
+static get mint() → core::int*
+  return -6144092014192636707;
+static method main() → dynamic {
+  final core::List<core::Object*>* values = <core::Object*>[new self::Impl1::•(), new self::BaseImpl2::•(), new self::SubImpl3::•()];
+  final self::Impl1* a = [@vm.direct-call.metadata=dart.core::_GrowableList::[]] [@vm.inferred-type.metadata=!? (skip check)] values.{core::List::[]}([@vm.inferred-type.metadata=int] core::int::parse("0")) as self::Impl1*;
+  final self::BaseImpl2* b = [@vm.direct-call.metadata=dart.core::_GrowableList::[]] [@vm.inferred-type.metadata=!? (skip check)] values.{core::List::[]}([@vm.inferred-type.metadata=int] core::int::parse("1")) as self::BaseImpl2*;
+  final self::SubImpl3* c = [@vm.direct-call.metadata=dart.core::_GrowableList::[]] [@vm.inferred-type.metadata=!? (skip check)] values.{core::List::[]}([@vm.inferred-type.metadata=int] core::int::parse("2")) as self::SubImpl3*;
+  final self::Interface* d = [@vm.direct-call.metadata=dart.core::_GrowableList::[]] [@vm.inferred-type.metadata=!? (skip check)] values.{core::List::[]}([@vm.inferred-type.metadata=int] core::int::parse("2")) as self::Interface*;
+  [@vm.direct-call.metadata=#lib::Impl1::takePositional??] [@vm.inferred-type.metadata=!? (skip check)] a.{self::Impl1::takePositional}(1, 1, 1.1, null, null, 1, null, null, new self::X::•());
+  b.{self::BaseImpl2::takePositional}(2, 2, 2.2, 2, 2.2, 2.2, 2, new self::X::•(), new self::X::•());
+  [@vm.direct-call.metadata=#lib::SubImpl3::takePositional??] [@vm.inferred-type.metadata=!? (skip check)] c.{self::SubImpl3::takePositional}(3, [@vm.inferred-type.metadata=int] self::mint, 3.3, [@vm.inferred-type.metadata=int] self::mint, 3.3, 3.3, 3.3, new self::X::•(), new self::X::•());
+  d.{self::Interface::takePositional}(3, [@vm.inferred-type.metadata=int] self::mint, 3.3, [@vm.inferred-type.metadata=int] self::mint, 3.3, 3.3, 3.3, new self::X::•(), new self::X::•());
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnUnboxedSmi] [@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 1)] a.{self::Impl1::returnUnboxedSmi}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnUnboxedInt] [@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 1)] a.{self::Impl1::returnUnboxedInt}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnUnboxedDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 1.1)] a.{self::Impl1::returnUnboxedDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedNullableInt] [@vm.inferred-type.metadata=dart.core::Null? (skip check) (value: null)] a.{self::Impl1::returnBoxedNullableInt}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedNullableDouble] [@vm.inferred-type.metadata=dart.core::Null? (skip check) (value: null)] a.{self::Impl1::returnBoxedNullableDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedIntOrDouble] [@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 1)] a.{self::Impl1::returnBoxedIntOrDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedNullableIntOrDouble] [@vm.inferred-type.metadata=dart.core::Null? (skip check) (value: null)] a.{self::Impl1::returnBoxedNullableIntOrDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedNullableX] [@vm.inferred-type.metadata=dart.core::Null? (skip check) (value: null)] a.{self::Impl1::returnBoxedNullableX}(null));
+  self::use([@vm.direct-call.metadata=#lib::Impl1::returnBoxedX] [@vm.inferred-type.metadata=#lib::X (skip check)] a.{self::Impl1::returnBoxedX}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Smi] b.{self::BaseImpl2::returnUnboxedSmi}(null));
+  self::use([@vm.inferred-type.metadata=int] b.{self::BaseImpl2::returnUnboxedInt}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] b.{self::BaseImpl2::returnUnboxedDouble}(null));
+  self::use([@vm.inferred-type.metadata=int] b.{self::BaseImpl2::returnBoxedNullableInt}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] b.{self::BaseImpl2::returnBoxedNullableDouble}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] b.{self::BaseImpl2::returnBoxedIntOrDouble}(null));
+  self::use([@vm.inferred-type.metadata=!] b.{self::BaseImpl2::returnBoxedNullableIntOrDouble}(null));
+  self::use([@vm.inferred-type.metadata=#lib::X] b.{self::BaseImpl2::returnBoxedNullableX}(null));
+  self::use([@vm.inferred-type.metadata=#lib::X] b.{self::BaseImpl2::returnBoxedX}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnUnboxedSmi] [@vm.inferred-type.metadata=dart.core::_Smi (skip check) (value: 3)] c.{self::SubImpl3::returnUnboxedSmi}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnUnboxedInt] [@vm.inferred-type.metadata=int (skip check)] c.{self::SubImpl3::returnUnboxedInt}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnUnboxedDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.3)] c.{self::SubImpl3::returnUnboxedDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedNullableInt] [@vm.inferred-type.metadata=int (skip check)] c.{self::SubImpl3::returnBoxedNullableInt}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedNullableDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.3)] c.{self::SubImpl3::returnBoxedNullableDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedIntOrDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.3)] c.{self::SubImpl3::returnBoxedIntOrDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedNullableIntOrDouble] [@vm.inferred-type.metadata=dart.core::_Double (skip check) (value: 3.3)] c.{self::SubImpl3::returnBoxedNullableIntOrDouble}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedNullableX] [@vm.inferred-type.metadata=#lib::X (skip check)] c.{self::SubImpl3::returnBoxedNullableX}(null));
+  self::use([@vm.direct-call.metadata=#lib::SubImpl3::returnBoxedX] [@vm.inferred-type.metadata=#lib::X (skip check)] c.{self::SubImpl3::returnBoxedX}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Smi] d.{self::Interface::returnUnboxedSmi}(null));
+  self::use([@vm.inferred-type.metadata=int] d.{self::Interface::returnUnboxedInt}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] d.{self::Interface::returnUnboxedDouble}(null));
+  self::use([@vm.inferred-type.metadata=int?] d.{self::Interface::returnBoxedNullableInt}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double?] d.{self::Interface::returnBoxedNullableDouble}(null));
+  self::use([@vm.inferred-type.metadata=!] d.{self::Interface::returnBoxedIntOrDouble}(null));
+  self::use([@vm.inferred-type.metadata=dart.core::_Double?] d.{self::Interface::returnBoxedNullableIntOrDouble}(null));
+  self::use([@vm.inferred-type.metadata=#lib::X?] d.{self::Interface::returnBoxedNullableX}(null));
+  self::use([@vm.inferred-type.metadata=#lib::X] d.{self::Interface::returnBoxedX}(null));
+  self::use(d.{self::Interface::takePositional});
+  self::use(d.{self::Interface::returnUnboxedSmi});
+  self::use(d.{self::Interface::returnUnboxedInt});
+  self::use(d.{self::Interface::returnUnboxedDouble});
+  self::use(d.{self::Interface::returnBoxedNullableInt});
+  self::use(d.{self::Interface::returnBoxedNullableDouble});
+  self::use(d.{self::Interface::returnBoxedIntOrDouble});
+  self::use(d.{self::Interface::returnBoxedNullableIntOrDouble});
+  self::use(d.{self::Interface::returnBoxedNullableX});
+  self::use(d.{self::Interface::returnBoxedX});
+}
+static method use(dynamic value) → void {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method.dart b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method.dart
new file mode 100644
index 0000000..58424bd
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method.dart
@@ -0,0 +1,101 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+final bool kTrue = int.parse('1') == 1 ? true : false;
+final bool kFalse = int.parse('1') == 2 ? true : false;
+int get mint => 0xaabbccddaabbccdd;
+int get smiOrMint => kTrue ? 1 : mint;
+
+class X {}
+
+void takePositional(
+    int unboxedSmi,
+    dynamic unboxedInt,
+    dynamic unboxedDouble,
+    dynamic boxedNullableInt,
+    dynamic boxedNullableDouble,
+    dynamic boxedIntOrDouble,
+    dynamic boxedNullableIntOrDouble,
+    dynamic boxedNullableX,
+    dynamic boxedX) {}
+
+void takeOptional(
+    [int unboxedSmi,
+    dynamic unboxedInt,
+    dynamic unboxedDouble,
+    dynamic boxedNullableInt,
+    dynamic boxedNullableDouble,
+    dynamic boxedIntOrDouble,
+    dynamic boxedNullableIntOrDouble,
+    dynamic boxedNullableX,
+    dynamic boxedX]) {}
+
+void takeNamed(
+    {int unboxedSmi,
+    dynamic unboxedInt,
+    dynamic unboxedDouble,
+    dynamic boxedNullableInt,
+    dynamic boxedNullableDouble,
+    dynamic boxedIntOrDouble,
+    dynamic boxedNullableIntOrDouble,
+    dynamic boxedNullableX,
+    dynamic boxedX}) {}
+
+dynamic returnUnboxedSmi() => kTrue ? 1 : 2;
+dynamic returnUnboxedInt() => kTrue ? smiOrMint : 2;
+dynamic returnUnboxedDouble() => kTrue ? 1.1 : 2.2;
+dynamic returnBoxedNullableInt() => kTrue ? smiOrMint : null;
+dynamic returnBoxedNullableDouble() => kTrue ? 1.1 : null;
+dynamic returnBoxedIntOrDouble() => kTrue ? smiOrMint : 1.1;
+dynamic returnBoxedNullableIntOrDouble() =>
+    kTrue ? (kFalse ? smiOrMint : 1.1) : null;
+dynamic returnBoxedNullableX() => kTrue ? X() : null;
+dynamic returnBoxedX() => X();
+
+main() {
+  takePositional(
+      kTrue ? 1 : 2,
+      kTrue ? smiOrMint : 2,
+      kTrue ? 1.1 : 2.2,
+      kTrue ? smiOrMint : null,
+      kTrue ? 1.1 : null,
+      kTrue ? smiOrMint : 1.1,
+      kTrue ? (kFalse ? smiOrMint : 1.1) : null,
+      kTrue ? X() : null,
+      X());
+
+  takeOptional(
+      kTrue ? 1 : 2,
+      kTrue ? smiOrMint : 2,
+      kTrue ? 1.1 : 2.2,
+      kTrue ? smiOrMint : null,
+      kTrue ? 1.1 : null,
+      kTrue ? smiOrMint : 1.1,
+      kTrue ? (kFalse ? smiOrMint : 1.1) : null,
+      kTrue ? X() : null,
+      X());
+
+  takeNamed(
+      unboxedSmi: kTrue ? 1 : 2,
+      unboxedInt: kTrue ? smiOrMint : 2,
+      unboxedDouble: kTrue ? 1.1 : 2.2,
+      boxedNullableInt: kTrue ? smiOrMint : null,
+      boxedNullableDouble: kTrue ? 1.1 : null,
+      boxedIntOrDouble: kTrue ? smiOrMint : 1.1,
+      boxedNullableIntOrDouble: kTrue ? (kFalse ? smiOrMint : 1.1) : null,
+      boxedNullableX: kTrue ? X() : null,
+      boxedX: X());
+
+  use(returnUnboxedSmi());
+  use(returnUnboxedInt());
+  use(returnUnboxedDouble());
+  use(returnBoxedNullableInt());
+  use(returnBoxedNullableDouble());
+  use(returnBoxedIntOrDouble());
+  use(returnBoxedNullableIntOrDouble());
+  use(returnBoxedNullableX());
+  use(returnBoxedX());
+}
+
+void use(dynamic value) {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method.dart.expect
new file mode 100644
index 0000000..186aedb
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method.dart.expect
@@ -0,0 +1,51 @@
+library #lib;
+import self as self;
+import "dart:core" as core;
+
+class X extends core::Object {
+  synthetic constructor •() → self::X*
+    : super core::Object::•()
+    ;
+}
+[@vm.inferred-type.metadata=dart.core::bool?]static final field core::bool* kTrue = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::==] [@vm.inferred-type.metadata=dart.core::bool (skip check)] [@vm.inferred-type.metadata=int] core::int::parse("1").{core::num::==}(1) ?{core::bool*} true : false;
+[@vm.inferred-type.metadata=dart.core::bool?]static final field core::bool* kFalse = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::==] [@vm.inferred-type.metadata=dart.core::bool (skip check)] [@vm.inferred-type.metadata=int] core::int::parse("1").{core::num::==}(2) ?{core::bool*} true : false;
+static get mint() → core::int*
+  return -6144092014192636707;
+static get smiOrMint() → core::int*
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : [@vm.inferred-type.metadata=int] self::mint;
+[@vm.unboxing-info.metadata=(i,i,d,b,b,b,b,b,b)->b]static method takePositional([@vm.inferred-type.metadata=dart.core::_Smi] core::int* unboxedSmi, [@vm.inferred-type.metadata=int] dynamic unboxedInt, [@vm.inferred-type.metadata=dart.core::_Double] dynamic unboxedDouble, [@vm.inferred-type.metadata=int?] dynamic boxedNullableInt, [@vm.inferred-type.metadata=dart.core::_Double?] dynamic boxedNullableDouble, [@vm.inferred-type.metadata=!] dynamic boxedIntOrDouble, dynamic boxedNullableIntOrDouble, [@vm.inferred-type.metadata=#lib::X?] dynamic boxedNullableX, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX) → void {}
+static method takeOptional([[@vm.inferred-type.metadata=dart.core::_Smi] core::int* unboxedSmi = #C1, [@vm.inferred-type.metadata=int] dynamic unboxedInt = #C1, [@vm.inferred-type.metadata=dart.core::_Double] dynamic unboxedDouble = #C1, [@vm.inferred-type.metadata=int?] dynamic boxedNullableInt = #C1, [@vm.inferred-type.metadata=dart.core::_Double?] dynamic boxedNullableDouble = #C1, [@vm.inferred-type.metadata=!] dynamic boxedIntOrDouble = #C1, dynamic boxedNullableIntOrDouble = #C1, [@vm.inferred-type.metadata=#lib::X?] dynamic boxedNullableX = #C1, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX = #C1]) → void {}
+static method takeNamed({[@vm.inferred-type.metadata=dart.core::_Smi] core::int* unboxedSmi = #C1, [@vm.inferred-type.metadata=int] dynamic unboxedInt = #C1, [@vm.inferred-type.metadata=dart.core::_Double] dynamic unboxedDouble = #C1, [@vm.inferred-type.metadata=int?] dynamic boxedNullableInt = #C1, [@vm.inferred-type.metadata=dart.core::_Double?] dynamic boxedNullableDouble = #C1, [@vm.inferred-type.metadata=!] dynamic boxedIntOrDouble = #C1, dynamic boxedNullableIntOrDouble = #C1, [@vm.inferred-type.metadata=#lib::X?] dynamic boxedNullableX = #C1, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX = #C1}) → void {}
+[@vm.unboxing-info.metadata=()->i]static method returnUnboxedSmi() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2;
+[@vm.unboxing-info.metadata=()->i]static method returnUnboxedInt() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2;
+[@vm.unboxing-info.metadata=()->d]static method returnUnboxedDouble() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2;
+static method returnBoxedNullableInt() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null;
+static method returnBoxedNullableDouble() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null;
+static method returnBoxedIntOrDouble() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1;
+static method returnBoxedNullableIntOrDouble() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null;
+static method returnBoxedNullableX() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null;
+static method returnBoxedX() → dynamic
+  return new self::X::•();
+static method main() → dynamic {
+  self::takePositional([@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null, new self::X::•());
+  self::takeOptional([@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null, new self::X::•());
+  self::takeNamed(unboxedSmi: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2, unboxedInt: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2, unboxedDouble: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2, boxedNullableInt: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null, boxedNullableDouble: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null, boxedIntOrDouble: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1, boxedNullableIntOrDouble: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null, boxedNullableX: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null, boxedX: new self::X::•());
+  self::use([@vm.inferred-type.metadata=dart.core::_Smi] self::returnUnboxedSmi());
+  self::use([@vm.inferred-type.metadata=int] self::returnUnboxedInt());
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] self::returnUnboxedDouble());
+  self::use([@vm.inferred-type.metadata=int?] self::returnBoxedNullableInt());
+  self::use([@vm.inferred-type.metadata=dart.core::_Double?] self::returnBoxedNullableDouble());
+  self::use([@vm.inferred-type.metadata=!] self::returnBoxedIntOrDouble());
+  self::use(self::returnBoxedNullableIntOrDouble());
+  self::use([@vm.inferred-type.metadata=#lib::X?] self::returnBoxedNullableX());
+  self::use([@vm.inferred-type.metadata=#lib::X] self::returnBoxedX());
+}
+static method use(dynamic value) → void {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method_tearoff.dart b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method_tearoff.dart
new file mode 100644
index 0000000..16bdbe5
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method_tearoff.dart
@@ -0,0 +1,113 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+final bool kTrue = int.parse('1') == 1 ? true : false;
+final bool kFalse = int.parse('1') == 2 ? true : false;
+int get mint => 0xaabbccddaabbccdd;
+int get smiOrMint => kTrue ? 1 : mint;
+
+class X {}
+
+void takePositional(
+    int unboxedSmi,
+    dynamic unboxedInt,
+    dynamic unboxedDouble,
+    dynamic boxedNullableInt,
+    dynamic boxedNullableDouble,
+    dynamic boxedIntOrDouble,
+    dynamic boxedNullableIntOrDouble,
+    dynamic boxedNullableX,
+    dynamic boxedX) {}
+
+void takeOptional(
+    [int unboxedSmi,
+    dynamic unboxedInt,
+    dynamic unboxedDouble,
+    dynamic boxedNullableInt,
+    dynamic boxedNullableDouble,
+    dynamic boxedIntOrDouble,
+    dynamic boxedNullableIntOrDouble,
+    dynamic boxedNullableX,
+    dynamic boxedX]) {}
+
+void takeNamed(
+    {int unboxedSmi,
+    dynamic unboxedInt,
+    dynamic unboxedDouble,
+    dynamic boxedNullableInt,
+    dynamic boxedNullableDouble,
+    dynamic boxedIntOrDouble,
+    dynamic boxedNullableIntOrDouble,
+    dynamic boxedNullableX,
+    dynamic boxedX}) {}
+
+dynamic returnUnboxedSmi() => kTrue ? 1 : 2;
+dynamic returnUnboxedInt() => kTrue ? smiOrMint : 2;
+dynamic returnUnboxedDouble() => kTrue ? 1.1 : 2.2;
+dynamic returnBoxedNullableInt() => kTrue ? smiOrMint : null;
+dynamic returnBoxedNullableDouble() => kTrue ? 1.1 : null;
+dynamic returnBoxedIntOrDouble() => kTrue ? smiOrMint : 1.1;
+dynamic returnBoxedNullableIntOrDouble() =>
+    kTrue ? (kFalse ? smiOrMint : 1.1) : null;
+dynamic returnBoxedNullableX() => kTrue ? X() : null;
+dynamic returnBoxedX() => X();
+
+main() {
+  takePositional(
+      kTrue ? 1 : 2,
+      kTrue ? smiOrMint : 2,
+      kTrue ? 1.1 : 2.2,
+      kTrue ? smiOrMint : null,
+      kTrue ? 1.1 : null,
+      kTrue ? smiOrMint : 1.1,
+      kTrue ? (kFalse ? smiOrMint : 1.1) : null,
+      kTrue ? X() : null,
+      X());
+
+  takeOptional(
+      kTrue ? 1 : 2,
+      kTrue ? smiOrMint : 2,
+      kTrue ? 1.1 : 2.2,
+      kTrue ? smiOrMint : null,
+      kTrue ? 1.1 : null,
+      kTrue ? smiOrMint : 1.1,
+      kTrue ? (kFalse ? smiOrMint : 1.1) : null,
+      kTrue ? X() : null,
+      X());
+
+  takeNamed(
+      unboxedSmi: kTrue ? 1 : 2,
+      unboxedInt: kTrue ? smiOrMint : 2,
+      unboxedDouble: kTrue ? 1.1 : 2.2,
+      boxedNullableInt: kTrue ? smiOrMint : null,
+      boxedNullableDouble: kTrue ? 1.1 : null,
+      boxedIntOrDouble: kTrue ? smiOrMint : 1.1,
+      boxedNullableIntOrDouble: kTrue ? (kFalse ? smiOrMint : 1.1) : null,
+      boxedNullableX: kTrue ? X() : null,
+      boxedX: X());
+
+  use(returnUnboxedSmi());
+  use(returnUnboxedInt());
+  use(returnUnboxedDouble());
+  use(returnBoxedNullableInt());
+  use(returnBoxedNullableDouble());
+  use(returnBoxedIntOrDouble());
+  use(returnBoxedNullableIntOrDouble());
+  use(returnBoxedNullableX());
+  use(returnBoxedX());
+
+  // Use as tear-offs.
+  use(takePositional);
+  use(returnUnboxedSmi);
+  use(returnUnboxedInt);
+  use(returnUnboxedDouble);
+  use(returnBoxedNullableInt);
+  use(returnBoxedNullableDouble);
+  use(returnBoxedIntOrDouble);
+  use(returnBoxedNullableIntOrDouble);
+  use(returnBoxedNullableX);
+  use(returnBoxedX);
+}
+
+void use(dynamic value) {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method_tearoff.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method_tearoff.dart.expect
new file mode 100644
index 0000000..4bc844d
--- /dev/null
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unboxed_static_method_tearoff.dart.expect
@@ -0,0 +1,61 @@
+library #lib;
+import self as self;
+import "dart:core" as core;
+
+class X extends core::Object {
+  synthetic constructor •() → self::X*
+    : super core::Object::•()
+    ;
+}
+[@vm.inferred-type.metadata=dart.core::bool?]static final field core::bool* kTrue = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::==] [@vm.inferred-type.metadata=dart.core::bool (skip check)] [@vm.inferred-type.metadata=int] core::int::parse("1").{core::num::==}(1) ?{core::bool*} true : false;
+[@vm.inferred-type.metadata=dart.core::bool?]static final field core::bool* kFalse = [@vm.direct-call.metadata=dart.core::_IntegerImplementation::==] [@vm.inferred-type.metadata=dart.core::bool (skip check)] [@vm.inferred-type.metadata=int] core::int::parse("1").{core::num::==}(2) ?{core::bool*} true : false;
+static get mint() → core::int*
+  return -6144092014192636707;
+static get smiOrMint() → core::int*
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : [@vm.inferred-type.metadata=int] self::mint;
+static method takePositional(core::int* unboxedSmi, dynamic unboxedInt, dynamic unboxedDouble, dynamic boxedNullableInt, dynamic boxedNullableDouble, dynamic boxedIntOrDouble, dynamic boxedNullableIntOrDouble, dynamic boxedNullableX, dynamic boxedX) → void {}
+static method takeOptional([[@vm.inferred-type.metadata=dart.core::_Smi] core::int* unboxedSmi = #C1, [@vm.inferred-type.metadata=int] dynamic unboxedInt = #C1, [@vm.inferred-type.metadata=dart.core::_Double] dynamic unboxedDouble = #C1, [@vm.inferred-type.metadata=int?] dynamic boxedNullableInt = #C1, [@vm.inferred-type.metadata=dart.core::_Double?] dynamic boxedNullableDouble = #C1, [@vm.inferred-type.metadata=!] dynamic boxedIntOrDouble = #C1, dynamic boxedNullableIntOrDouble = #C1, [@vm.inferred-type.metadata=#lib::X?] dynamic boxedNullableX = #C1, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX = #C1]) → void {}
+static method takeNamed({[@vm.inferred-type.metadata=dart.core::_Smi] core::int* unboxedSmi = #C1, [@vm.inferred-type.metadata=int] dynamic unboxedInt = #C1, [@vm.inferred-type.metadata=dart.core::_Double] dynamic unboxedDouble = #C1, [@vm.inferred-type.metadata=int?] dynamic boxedNullableInt = #C1, [@vm.inferred-type.metadata=dart.core::_Double?] dynamic boxedNullableDouble = #C1, [@vm.inferred-type.metadata=!] dynamic boxedIntOrDouble = #C1, dynamic boxedNullableIntOrDouble = #C1, [@vm.inferred-type.metadata=#lib::X?] dynamic boxedNullableX = #C1, [@vm.inferred-type.metadata=#lib::X] dynamic boxedX = #C1}) → void {}
+[@vm.unboxing-info.metadata=()->i]static method returnUnboxedSmi() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2;
+[@vm.unboxing-info.metadata=()->i]static method returnUnboxedInt() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2;
+[@vm.unboxing-info.metadata=()->d]static method returnUnboxedDouble() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2;
+static method returnBoxedNullableInt() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null;
+static method returnBoxedNullableDouble() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null;
+static method returnBoxedIntOrDouble() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1;
+static method returnBoxedNullableIntOrDouble() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null;
+static method returnBoxedNullableX() → dynamic
+  return [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null;
+static method returnBoxedX() → dynamic
+  return new self::X::•();
+static method main() → dynamic {
+  self::takePositional([@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null, new self::X::•());
+  self::takeOptional([@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null, [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null, new self::X::•());
+  self::takeNamed(unboxedSmi: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} 1 : 2, unboxedInt: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : 2, unboxedDouble: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : 2.2, boxedNullableInt: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::int*} [@vm.inferred-type.metadata=int] self::smiOrMint : null, boxedNullableDouble: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::double*} 1.1 : null, boxedIntOrDouble: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1, boxedNullableIntOrDouble: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{core::num*} [@vm.inferred-type.metadata=dart.core::bool?] self::kFalse ?{core::num*} [@vm.inferred-type.metadata=int] self::smiOrMint : 1.1 : null, boxedNullableX: [@vm.inferred-type.metadata=dart.core::bool?] self::kTrue ?{self::X*} new self::X::•() : null, boxedX: new self::X::•());
+  self::use([@vm.inferred-type.metadata=dart.core::_Smi] self::returnUnboxedSmi());
+  self::use([@vm.inferred-type.metadata=int] self::returnUnboxedInt());
+  self::use([@vm.inferred-type.metadata=dart.core::_Double] self::returnUnboxedDouble());
+  self::use([@vm.inferred-type.metadata=int?] self::returnBoxedNullableInt());
+  self::use([@vm.inferred-type.metadata=dart.core::_Double?] self::returnBoxedNullableDouble());
+  self::use([@vm.inferred-type.metadata=!] self::returnBoxedIntOrDouble());
+  self::use(self::returnBoxedNullableIntOrDouble());
+  self::use([@vm.inferred-type.metadata=#lib::X?] self::returnBoxedNullableX());
+  self::use([@vm.inferred-type.metadata=#lib::X] self::returnBoxedX());
+  self::use(#C2);
+  self::use(#C3);
+  self::use(#C4);
+  self::use(#C5);
+  self::use(#C6);
+  self::use(#C7);
+  self::use(#C8);
+  self::use(#C9);
+  self::use(#C10);
+  self::use(#C11);
+}
+static method use(dynamic value) → void {}
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unfinished_static_field_init.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/unfinished_static_field_init.dart.expect
index 4e012e2..74d3bb3 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/unfinished_static_field_init.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unfinished_static_field_init.dart.expect
@@ -3,17 +3,17 @@
 import "dart:core" as core;
 
 class A extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::A*
+  synthetic constructor •() → self::A*
     : super core::Object::•()
     ;
 }
 [@vm.inferred-type.metadata=#lib::A?]static field dynamic static_field_good = [@vm.inferred-type.metadata=#lib::A] self::good();
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field dynamic static_field_bad = [@vm.inferred-type.metadata=!] self::bad();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method good() → dynamic
+static method good() → dynamic
   return new self::A::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method bad() → dynamic
+static method bad() → dynamic
   return throw "No return!";
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   core::print([@vm.inferred-type.metadata=#lib::A?] self::static_field_good);
   core::print([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::static_field_bad);
 }
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/unreachable.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/unreachable.dart.expect
index 2e7e6be..47a15c4 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/unreachable.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/unreachable.dart.expect
@@ -7,16 +7,16 @@
 abstract class A extends core::Object implements self::I {
 }
 class B extends core::Object implements self::I {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::B*
+  synthetic constructor •() → self::B*
     : super core::Object::•()
     ;
 }
 [@vm.inferred-type.metadata=#lib::B?]static field self::I* ii = new self::B::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method bar([@vm.inferred-type.metadata=#lib::B?] self::I* i) → void {
+static method bar([@vm.inferred-type.metadata=#lib::B?] self::I* i) → void {
   if(i is self::A*) {
     let dynamic #t1 = i{self::A*} in let dynamic #t2 = 42 in throw "Attempt to execute code removed by Dart AOT compiler (TFA)";
   }
 }
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main(core::List<core::String*>* args) → dynamic {
+static method main(core::List<core::String*>* args) → dynamic {
   self::bar([@vm.inferred-type.metadata=#lib::B?] self::ii);
 }
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/write_only_field.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/write_only_field.dart.expect
index ec1d988..e02c5ea 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/write_only_field.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/write_only_field.dart.expect
@@ -5,19 +5,19 @@
 abstract class A extends core::Object {
 }
 class B extends core::Object {
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  constructor •() → self::B*
+  constructor •() → self::B*
     : super core::Object::•() {
     core::print("B");
   }
 }
 class C extends core::Object {
 [@vm.inferred-type.metadata=#lib::B?] [@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:1,getterSelectorId:2]  field self::B* instanceField = new self::B::•();
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']  synthetic constructor •() → self::C*
+  synthetic constructor •() → self::C*
     : super core::Object::•()
     ;
 }
 [@vm.inferred-type.metadata=dart.core::Null? (value: null)]static field self::A* field = throw "Attempt to execute code removed by Dart AOT compiler (TFA)";
-[@vm.unboxing-info.metadata=Instance of 'UnboxingInfoMetadata']static method main() → void {
+static method main() → void {
   self::field = null;
   [@vm.direct-call.metadata=#lib::C::instanceField] [@vm.inferred-type.metadata=!? (skip check)] new self::C::•().{self::C::instanceField} = null;
 }
diff --git a/pkg/vm/testcases/transformations/unreachable_code_elimination/uce_testcases.dart b/pkg/vm/testcases/transformations/unreachable_code_elimination/uce_testcases.dart
index 378c297..6115eb3 100644
--- a/pkg/vm/testcases/transformations/unreachable_code_elimination/uce_testcases.dart
+++ b/pkg/vm/testcases/transformations/unreachable_code_elimination/uce_testcases.dart
@@ -96,6 +96,12 @@
   } catch (e) {
     assert(foo());
   }
+  try {
+    assert(foo());
+  } catch (e) {
+    assert(foo());
+    rethrow;
+  }
   switch (42) {
     case 10:
       assert(foo());
diff --git a/pkg/vm/testcases/transformations/unreachable_code_elimination/uce_testcases.dart.expect b/pkg/vm/testcases/transformations/unreachable_code_elimination/uce_testcases.dart.expect
index bea1e0c..acdab7a 100644
--- a/pkg/vm/testcases/transformations/unreachable_code_elimination/uce_testcases.dart.expect
+++ b/pkg/vm/testcases/transformations/unreachable_code_elimination/uce_testcases.dart.expect
@@ -63,14 +63,12 @@
       core::int* i = :sync-for-iterator.{core::Iterator::current};
     }
   }
-  try {
-  }
-  finally {
-  }
+  {}
   try {
   }
   on dynamic catch(final dynamic e) {
   }
+  {}
   switch(42) {
     #L1:
     case #C3:
diff --git a/runtime/BUILD.gn b/runtime/BUILD.gn
index a5bdc9c..88b27a9 100644
--- a/runtime/BUILD.gn
+++ b/runtime/BUILD.gn
@@ -211,8 +211,8 @@
 library_for_all_configs("libdart") {
   target_type = dart_component_kind
   extra_deps = [
-    "third_party/double-conversion/src:libdouble_conversion",
     ":generate_version_cc_file",
+    "third_party/double-conversion/src:libdouble_conversion",
   ]
   if (dart_enable_wasm) {
     extra_deps += [ "//third_party/wasmer" ]
@@ -260,9 +260,7 @@
     inputs += [ "$default_git_folder/logs/HEAD" ]
   }
   output = "$target_gen_dir/version.cc"
-  outputs = [
-    output,
-  ]
+  outputs = [ output ]
 
   script = "../tools/make_version.py"
   args = [
diff --git a/runtime/bin/BUILD.gn b/runtime/bin/BUILD.gn
index 14b40c7..69363cf 100644
--- a/runtime/bin/BUILD.gn
+++ b/runtime/bin/BUILD.gn
@@ -43,13 +43,9 @@
     deps = []
     if (is_fuchsia) {
       if (using_fuchsia_sdk) {
-        public_deps = [
-          "$fuchsia_sdk_root/pkg:fdio",
-        ]
+        public_deps = [ "$fuchsia_sdk_root/pkg:fdio" ]
       } else {
-        public_deps = [
-          "//zircon/public/lib/fdio",
-        ]
+        public_deps = [ "//zircon/public/lib/fdio" ]
       }
     }
     include_dirs = [ ".." ]
@@ -106,9 +102,7 @@
     "..:dart_os_fuchsia_config",
   ]
   include_dirs = [ ".." ]
-  sources = [
-    "crashpad.cc",
-  ]
+  sources = [ "crashpad.cc" ]
 
   if (dart_use_crashpad) {
     assert(is_win, "dart_use_crashpad is only supported on Windows")
@@ -142,15 +136,11 @@
 }
 
 build_elf_loader("elf_loader") {
-  deps = [
-    ":libdart_builtin",
-  ]
+  deps = [ ":libdart_builtin" ]
 }
 
 build_elf_loader("elf_loader_product") {
-  deps = [
-    ":libdart_builtin_product",
-  ]
+  deps = [ ":libdart_builtin_product" ]
 }
 
 template("build_gen_snapshot") {
@@ -241,8 +231,8 @@
   extra_deps = [
     ":gen_snapshot_dart_io",
     ":libdart_builtin",
-    "../platform:libdart_platform_precompiler",
     "..:libdart_precompiler",
+    "../platform:libdart_platform_precompiler",
   ]
 }
 
@@ -255,8 +245,8 @@
   extra_deps = [
     ":gen_snapshot_dart_io_product",
     ":libdart_builtin_product",
-    "../platform:libdart_platform_precompiler_product",
     "..:libdart_precompiler_product",
+    "../platform:libdart_platform_precompiler_product",
   ]
 }
 
@@ -269,8 +259,8 @@
   extra_deps = [
     ":gen_snapshot_dart_io_fuchsia",
     ":libdart_builtin_fuchsia",
-    "../platform:libdart_platform_precompiler_fuchsia",
     "..:libdart_precompiler_fuchsia",
+    "../platform:libdart_platform_precompiler_fuchsia",
   ]
 }
 
@@ -283,8 +273,8 @@
   extra_deps = [
     ":gen_snapshot_dart_io_product_fuchsia",
     ":libdart_builtin_product_fuchsia",
-    "../platform:libdart_platform_precompiler_product_fuchsia",
     "..:libdart_precompiler_product_fuchsia",
+    "../platform:libdart_platform_precompiler_product_fuchsia",
   ]
 }
 
@@ -293,8 +283,8 @@
   extra_deps = [
     ":gen_snapshot_dart_io_host_targeting_host",
     ":libdart_builtin_host_targeting_host",
-    "../platform:libdart_platform_precompiler_host_targeting_host",
     "..:libdart_precompiler_host_targeting_host",
+    "../platform:libdart_platform_precompiler_host_targeting_host",
   ]
 }
 
@@ -303,8 +293,8 @@
   extra_deps = [
     ":gen_snapshot_dart_io_host_targeting_host",
     ":libdart_builtin_host_targeting_host",
-    "../platform:libdart_platform_precompiler_host_targeting_host",
     "..:libdart_precompiler_host_targeting_host",
+    "../platform:libdart_platform_precompiler_host_targeting_host",
   ]
 }
 
@@ -328,17 +318,13 @@
           "$fuchsia_sdk_root/fidl:fuchsia.netstack",
           "$fuchsia_sdk_root/pkg:sys_cpp",
         ]
-        public_deps = [
-          "$fuchsia_sdk_root/pkg:fdio",
-        ]
+        public_deps = [ "$fuchsia_sdk_root/pkg:fdio" ]
       } else {
         deps += [
           "//sdk/fidl/fuchsia.netstack",
           "//sdk/lib/sys/cpp",
         ]
-        public_deps = [
-          "//zircon/public/lib/fdio",
-        ]
+        public_deps = [ "//zircon/public/lib/fdio" ]
       }
     }
 
@@ -468,17 +454,13 @@
           "$fuchsia_sdk_root/fidl:fuchsia.netstack",
           "$fuchsia_sdk_root/pkg:sys_cpp",
         ]
-        public_deps = [
-          "$fuchsia_sdk_root/pkg:fdio",
-        ]
+        public_deps = [ "$fuchsia_sdk_root/pkg:fdio" ]
       } else {
         deps += [
           "//sdk/fidl/fuchsia.netstack",
           "//sdk/lib/sys/cpp",
         ]
-        public_deps = [
-          "//zircon/public/lib/fdio",
-        ]
+        public_deps = [ "//zircon/public/lib/fdio" ]
       }
     }
 
@@ -507,9 +489,9 @@
 dart_io("dart_io_api") {
   extra_configs = [ "..:dart_maybe_product_config" ]
   extra_sources = [
+    "../include/bin/dart_io_api.h",
     "builtin.cc",
     "dart_io_api_impl.cc",
-    "../include/bin/dart_io_api.h",
   ]
   extra_deps = [ ":libdart_builtin" ]
 }
@@ -517,9 +499,9 @@
 dart_io("dart_io_api_product") {
   extra_configs = [ "..:dart_product_config" ]
   extra_sources = [
+    "../include/bin/dart_io_api.h",
     "builtin.cc",
     "dart_io_api_impl.cc",
-    "../include/bin/dart_io_api.h",
   ]
   extra_deps = [ ":libdart_builtin_product" ]
 }
@@ -531,9 +513,7 @@
 }
 
 gen_snapshot_action("generate_snapshot_bin") {
-  deps = [
-    "../vm:vm_platform_stripped",
-  ]
+  deps = [ "../vm:vm_platform_stripped" ]
   vm_snapshot_data = "$target_gen_dir/vm_snapshot_data.bin"
   vm_snapshot_instructions = "$target_gen_dir/vm_snapshot_instructions.bin"
   isolate_snapshot_data = "$target_gen_dir/isolate_snapshot_data.bin"
@@ -541,9 +521,7 @@
       "$target_gen_dir/isolate_snapshot_instructions.bin"
 
   platform_dill = "$root_out_dir/vm_platform_strong_stripped.dill"
-  inputs = [
-    platform_dill,
-  ]
+  inputs = [ platform_dill ]
   outputs = [
     vm_snapshot_data,
     vm_snapshot_instructions,
@@ -602,12 +580,8 @@
     if (invoker.executable) {
       args += [ "--executable" ]
     }
-    inputs = [
-      invoker.input,
-    ]
-    outputs = [
-      output,
-    ]
+    inputs = [ invoker.input ]
+    outputs = [ output ]
   }
 }
 
@@ -646,12 +620,8 @@
     if (current_cpu == "x64") {
       args += [ "--64-bit" ]
     }
-    inputs = [
-      invoker.input,
-    ]
-    outputs = [
-      output,
-    ]
+    inputs = [ invoker.input ]
+    outputs = [ output ]
   }
 }
 
@@ -670,45 +640,35 @@
 }
 
 bin_to_linkable("vm_snapshot_data_linkable") {
-  deps = [
-    ":generate_snapshot_bin",
-  ]
+  deps = [ ":generate_snapshot_bin" ]
   input = "$target_gen_dir/vm_snapshot_data.bin"
   symbol = "kDartVmSnapshotData"
   executable = false
 }
 
 bin_to_linkable("vm_snapshot_instructions_linkable") {
-  deps = [
-    ":generate_snapshot_bin",
-  ]
+  deps = [ ":generate_snapshot_bin" ]
   input = "$target_gen_dir/vm_snapshot_instructions.bin"
   symbol = "kDartVmSnapshotInstructions"
   executable = true
 }
 
 bin_to_linkable("isolate_snapshot_data_linkable") {
-  deps = [
-    ":generate_snapshot_bin",
-  ]
+  deps = [ ":generate_snapshot_bin" ]
   input = "$target_gen_dir/isolate_snapshot_data.bin"
   symbol = "kDartCoreIsolateSnapshotData"
   executable = false
 }
 
 bin_to_linkable("isolate_snapshot_instructions_linkable") {
-  deps = [
-    ":generate_snapshot_bin",
-  ]
+  deps = [ ":generate_snapshot_bin" ]
   input = "$target_gen_dir/isolate_snapshot_instructions.bin"
   symbol = "kDartCoreIsolateSnapshotInstructions"
   executable = true
 }
 
 bin_to_linkable("kernel_service_dill_linkable") {
-  deps = [
-    "../../utils/kernel-service:kernel_service_dill",
-  ]
+  deps = [ "../../utils/kernel-service:kernel_service_dill" ]
   input = "$root_gen_dir/kernel_service.dill"
   symbol = "kKernelServiceDill"
   size_symbol = "kKernelServiceDillSize"
@@ -716,9 +676,7 @@
 }
 
 bin_to_linkable("platform_strong_dill_linkable") {
-  deps = [
-    "../vm:vm_platform",
-  ]
+  deps = [ "../vm:vm_platform" ]
   input = "$root_out_dir/vm_platform_strong.dill"
   symbol = "kPlatformStrongDill"
   size_symbol = "kPlatformStrongDillSize"
@@ -758,9 +716,7 @@
     "abi_version_in.cc",
   ]
   output = "$target_gen_dir/abi_version.cc"
-  outputs = [
-    output,
-  ]
+  outputs = [ output ]
 
   script = "../../tools/make_version.py"
   args = [
@@ -878,9 +834,9 @@
 
 dart_executable("dart") {
   extra_deps = [
+    ":dart_snapshot_cc",
     "..:libdart_jit",
     "../platform:libdart_platform_jit",
-    ":dart_snapshot_cc",
   ]
   if (dart_runtime_mode != "release") {
     extra_deps += [ "../observatory:standalone_observatory_archive" ]
@@ -930,22 +886,16 @@
 }
 
 executable("process_test") {
-  sources = [
-    "process_test.cc",
-  ]
+  sources = [ "process_test.cc" ]
 }
 
 prebuilt_dart_action("gen_kernel_bytecode_dill") {
-  deps = [
-    "../vm:vm_platform",
-  ]
+  deps = [ "../vm:vm_platform" ]
   platform_dill = "$root_out_dir/vm_platform_strong.dill"
 
   output = "$root_out_dir/gen_kernel_bytecode.dill"
   depfile = "$target_gen_dir/gen_kernel_bytecode.dill.d"
-  outputs = [
-    output,
-  ]
+  outputs = [ output ]
 
   script = "../../pkg/vm/bin/gen_kernel.dart"
 
@@ -1059,9 +1009,7 @@
 }
 
 shared_library("test_extension") {
-  deps = [
-    ":dart",
-  ]
+  deps = [ ":dart" ]
   sources = [
     "test_extension.c",
     "test_extension_dllmain_win.cc",
@@ -1082,9 +1030,7 @@
 }
 
 shared_library("entrypoints_verification_test_extension") {
-  deps = [
-    ":dart",
-  ]
+  deps = [ ":dart" ]
   sources = [
     "entrypoints_verification_test_extension.cc",
     "entrypoints_verification_test_extension_dllmain_win.cc",
@@ -1105,12 +1051,8 @@
 }
 
 shared_library("ffi_test_dynamic_library") {
-  deps = [
-    ":dart",
-  ]
-  sources = [
-    "ffi_test/ffi_test_dynamic_library.cc",
-  ]
+  deps = [ ":dart" ]
+  sources = [ "ffi_test/ffi_test_dynamic_library.cc" ]
   include_dirs = [ ".." ]
   defines = [
     # The only effect of DART_SHARED_LIB is to export the Dart API.
@@ -1128,9 +1070,7 @@
 }
 
 shared_library("ffi_test_functions") {
-  deps = [
-    ":dart",
-  ]
+  deps = [ ":dart" ]
 
   # The two files here do not depend on each other.
   # flutter/flutter integration tests will only use `ffi_test_functions.cc` -
@@ -1162,9 +1102,7 @@
 }
 
 shared_library("sample_extension") {
-  deps = [
-    ":dart",
-  ]
+  deps = [ ":dart" ]
   sources = [
     "../../samples/sample_extension/sample_extension.cc",
     "../../samples/sample_extension/sample_extension_dllmain_win.cc",
diff --git a/runtime/bin/builtin_impl_sources.gni b/runtime/bin/builtin_impl_sources.gni
index 385df57..fe0251f 100644
--- a/runtime/bin/builtin_impl_sources.gni
+++ b/runtime/bin/builtin_impl_sources.gni
@@ -15,10 +15,10 @@
   "crypto_linux.cc",
   "crypto_macos.cc",
   "crypto_win.cc",
-  "dartutils.cc",
-  "dartutils.h",
   "dartdev_utils.cc",
   "dartdev_utils.h",
+  "dartutils.cc",
+  "dartutils.h",
   "directory.cc",
   "directory.h",
   "directory_android.cc",
@@ -26,10 +26,10 @@
   "directory_linux.cc",
   "directory_macos.cc",
   "directory_win.cc",
-  "exe_utils.h",
   "exe_utils.cc",
-  "extensions.h",
+  "exe_utils.h",
   "extensions.cc",
+  "extensions.h",
   "extensions_android.cc",
   "extensions_fuchsia.cc",
   "extensions_linux.cc",
diff --git a/runtime/bin/io_impl_sources.gni b/runtime/bin/io_impl_sources.gni
index e40832d..84a93ad 100644
--- a/runtime/bin/io_impl_sources.gni
+++ b/runtime/bin/io_impl_sources.gni
@@ -104,6 +104,6 @@
   "sync_socket_linux.cc",
   "sync_socket_macos.cc",
   "sync_socket_win.cc",
-  "typed_data_utils.h",
   "typed_data_utils.cc",
+  "typed_data_utils.h",
 ]
diff --git a/runtime/docs/gc.md b/runtime/docs/gc.md
index 6b8aaaa..70c58ea 100644
--- a/runtime/docs/gc.md
+++ b/runtime/docs/gc.md
@@ -139,3 +139,46 @@
 New-space objects and roots are only visited during a safepoint, and safepoints establish synchronization.
 
 When the mutator's mark block becomes full, it transfered to the marker by an acquire-release operation, so the marker will see the stores into the block.
+
+## Write barrier elimination
+
+Whenever there is a store into the heap, ```container.slot = value```, we need to check if the store creates references that the GC needs to be informed about.
+
+The generational write barrier, needed by the scavenger, checks if
+
+* `container` is old and not in the remembered set, and
+* `value` is new
+
+When this occurs, we must insert `container` into the remembered set.
+
+The incremental marking write barrier, needed by the marker, checks if
+
+* `container` is old, and
+* `value` is old and not marked, and
+* marking is in progress
+
+When this occurs, we must insert `value` into the marking worklist.
+
+We can eliminate these checks when the compiler can prove these cases cannot happen, or are compensated for by the runtime. The compiler can prove this when
+
+* `value` is a constant. Constants are always old, and they will be marked via the constant pools even if we fail to mark them via `container`.
+* `value` has the static type bool. All possible values of the bool type (null, false, true) are constants.
+* `value` is known to be a Smi. Smis are not heap objects.
+* `container` is the same object as `value`. The GC never needs to retain an additional object if it sees a self-reference, so ignoring a self-reference cannot cause us to free a reachable object.
+* `container` is known to be a new object or known to be an old object that is in the remembered set and is marked if marking is in progress.
+
+We can know that `container` meets the last property if `container` is the result of an allocation (instead of a heap load), and there is no instruction that can trigger a GC between the allocation and the store. This is because the allocation stubs ensure the result of AllocateObject is either a new-space object (common case, bump pointer allocation succeeds), or has been pre-emptively added to the remembered set and marking worklist (uncommon case, entered runtime to allocate object, possibly triggering GC).
+
+```
+container <- AllocateObject
+<intructions that do not trigger GC>
+StoreInstanceField(container, value, NoBarrier)
+```
+
+We can further eliminate barriers when `container` is the result of an allocation, and there is no instruction that can create an additional Dart frame between the allocation and the store. This is because after a GC, any old-space objects in the frames below an exit frame will be pre-emptively added to the remembered set and marking worklist (Thread::RestoreWriteBarrierInvariant).
+
+```
+container <- AllocateObject
+<instructions that cannot directly call Dart functions>
+StoreInstanceField(container, value, NoBarrier)
+```
diff --git a/runtime/llvm_codegen/bit/BUILD.gn b/runtime/llvm_codegen/bit/BUILD.gn
index a7365c1..a021ffe 100644
--- a/runtime/llvm_codegen/bit/BUILD.gn
+++ b/runtime/llvm_codegen/bit/BUILD.gn
@@ -3,27 +3,19 @@
 # BSD-style license that can be found in the LICENSE file.
 
 executable("bit") {
-  sources = [
-    "main.cc",
-  ]
+  sources = [ "main.cc" ]
   root_dir = rebase_path(root_out_dir)
   clang_dir = rebase_path("//buildtools/linux-x64/clang/bin")
   defines = [
     "BIT_BINARY_DIR=\"$root_dir\"",
     "BIT_CLANG_DIR=\"$clang_dir\"",
   ]
-  deps = [
-    "../../../third_party/llvm:LLVMSupport",
-  ]
-  data_deps = [
-    "../codegen",
-  ]
+  deps = [ "../../../third_party/llvm:LLVMSupport" ]
+  data_deps = [ "../codegen" ]
 }
 
 source_set("test") {
-  sources = [
-    "test.cc",
-  ]
+  sources = [ "test.cc" ]
 
   root_dir = rebase_path(root_out_dir)
   clang_dir = rebase_path("//buildtools/linux-x64/clang/bin")
@@ -32,9 +24,7 @@
     "BIT_CLANG_DIR=\"$clang_dir\"",
   ]
 
-  deps = [
-    "../../../third_party/llvm:LLVMSupport",
-  ]
+  deps = [ "../../../third_party/llvm:LLVMSupport" ]
 
   include_dirs = [ "//runtime" ]
 
diff --git a/runtime/llvm_codegen/codegen/BUILD.gn b/runtime/llvm_codegen/codegen/BUILD.gn
index 4ccb309..2e0a833b 100644
--- a/runtime/llvm_codegen/codegen/BUILD.gn
+++ b/runtime/llvm_codegen/codegen/BUILD.gn
@@ -18,12 +18,8 @@
 }
 
 copy("lib_llvm") {
-  sources = [
-    _lib_llvm_so,
-  ]
-  outputs = [
-    "$root_out_dir/libLLVM-9svn.so",
-  ]
+  sources = [ _lib_llvm_so ]
+  outputs = [ "$root_out_dir/libLLVM-9svn.so" ]
   public_configs = [ ":llvm" ]
 }
 
diff --git a/runtime/llvm_codegen/test/BUILD.gn b/runtime/llvm_codegen/test/BUILD.gn
index b30e840..633d3dc 100644
--- a/runtime/llvm_codegen/test/BUILD.gn
+++ b/runtime/llvm_codegen/test/BUILD.gn
@@ -4,7 +4,7 @@
 
 group("test") {
   deps = [
-    "codegen",
     "bit",
+    "codegen",
   ]
 }
diff --git a/runtime/llvm_codegen/test/bit_test.gni b/runtime/llvm_codegen/test/bit_test.gni
index 77f65fe..6b19e62 100644
--- a/runtime/llvm_codegen/test/bit_test.gni
+++ b/runtime/llvm_codegen/test/bit_test.gni
@@ -21,21 +21,18 @@
     script = "//runtime/llvm_codegen/test/run_bit.py"
     sources = invoker.tests
 
-    deps = [
-      "../../bit",
-    ]
-    inputs = [
-      "${root_out_dir}/bit$executable_suffix",
-    ]
+    deps = [ "../../bit" ]
+    inputs = [ "${root_out_dir}/bit$executable_suffix" ]
 
     # This output is always dirty so ninja will always run this step when asked to.
-    outputs = [
-      "$target_gen_dir/{{source_name_part}}}",
-    ]
+    outputs = [ "$target_gen_dir/{{source_name_part}}}" ]
     args = [
-      "--bit", rebase_path("${root_out_dir}/bit"),
-      "--test", "{{source}}",
-      "--out", rebase_path(target_gen_dir),
+      "--bit",
+      rebase_path("${root_out_dir}/bit"),
+      "--test",
+      "{{source}}",
+      "--out",
+      rebase_path(target_gen_dir),
     ]
   }
 }
diff --git a/runtime/observatory/BUILD.gn b/runtime/observatory/BUILD.gn
index 554e899..b47dce6 100644
--- a/runtime/observatory/BUILD.gn
+++ b/runtime/observatory/BUILD.gn
@@ -16,9 +16,7 @@
   inputs = [ ".packages" ] + observatory_sources
 
   output = "$target_gen_dir/observatory/web/main.dart.js"
-  outputs = [
-    output,
-  ]
+  outputs = [ output ]
   if (is_debug) {
     outputs += [ "$target_gen_dir/observatory/web/main.dart.js.map" ]
   }
@@ -159,18 +157,12 @@
 
 copy("copy_main_dart_js") {
   visibility = [ ":deploy_observatory" ]
-  deps = [
-    ":build_observatory",
-  ]
-  sources = [
-    "$target_gen_dir/observatory/web/main.dart.js",
-  ]
+  deps = [ ":build_observatory" ]
+  sources = [ "$target_gen_dir/observatory/web/main.dart.js" ]
   if (is_debug) {
     sources += [ "$target_gen_dir/observatory/web/main.dart.js.map" ]
   }
-  outputs = [
-    "$target_out_dir/observatory/deployed/web/{{source_file_part}}",
-  ]
+  outputs = [ "$target_out_dir/observatory/deployed/web/{{source_file_part}}" ]
 }
 
 group("deploy_observatory") {
@@ -190,16 +182,12 @@
     enable_compression = true
   }
   action(target_name) {
-    deps = [
-      ":deploy_observatory",
-    ]
+    deps = [ ":deploy_observatory" ]
 
     output_name = target_name
 
     output = "$target_gen_dir/${output_name}.tar"
-    outputs = [
-      output,
-    ]
+    outputs = [ output ]
 
     script = "../tools/create_archive.py"
     args = [
@@ -220,18 +208,12 @@
 
 copy("copy_compressed_observatory_archive") {
   archive_target = ":compressed_observatory_archive"
-  deps = [
-    archive_target,
-  ]
+  deps = [ archive_target ]
   archive_dir = get_label_info(archive_target, "target_gen_dir")
   archive_name = get_label_info(archive_target, "name")
   archive_file = "${archive_dir}/${archive_name}.tar"
-  sources = [
-    archive_file,
-  ]
-  outputs = [
-    "$root_out_dir/${archive_name}.tar",
-  ]
+  sources = [ archive_file ]
+  outputs = [ "$root_out_dir/${archive_name}.tar" ]
 }
 
 observatory_archive("observatory_archive") {
@@ -240,18 +222,12 @@
 
 copy("copy_observatory_archive") {
   archive_target = ":observatory_archive"
-  deps = [
-    archive_target,
-  ]
+  deps = [ archive_target ]
   archive_dir = get_label_info(archive_target, "target_gen_dir")
   archive_name = get_label_info(archive_target, "name")
   archive_file = "${archive_dir}/${archive_name}.tar"
-  sources = [
-    archive_file,
-  ]
-  outputs = [
-    "$root_out_dir/${archive_name}.tar",
-  ]
+  sources = [ archive_file ]
+  outputs = [ "$root_out_dir/${archive_name}.tar" ]
 }
 
 # Generates a .cc file containing the bytes of the observatory archive in a C
@@ -277,14 +253,10 @@
   action(target_name) {
     forward_variables_from(invoker, [ "deps" ])
 
-    inputs = [
-      invoker.archive_file,
-    ]
+    inputs = [ invoker.archive_file ]
 
     output = "$target_gen_dir/${target_name}.cc"
-    outputs = [
-      output,
-    ]
+    outputs = [ output ]
 
     script = "../tools/create_archive.py"
     args = [
@@ -308,22 +280,16 @@
 
   # TODO(zra): In a Fuchsia build, use a prebuilt Observatory archive.
   archive_target = ":observatory_archive"
-  deps = [
-    archive_target,
-  ]
+  deps = [ archive_target ]
   archive_dir = get_label_info(archive_target, "target_gen_dir")
   archive_name = get_label_info(archive_target, "name")
   archive_file = "${archive_dir}/${archive_name}.tar"
 }
 
 source_set("embedded_observatory_archive") {
-  deps = [
-    ":embedded_archive_observatory",
-  ]
+  deps = [ ":embedded_archive_observatory" ]
 
-  sources = [
-    rebase_path("$target_gen_dir/embedded_archive_observatory.cc"),
-  ]
+  sources = [ rebase_path("$target_gen_dir/embedded_archive_observatory.cc") ]
 }
 
 observatory_archive_source("standalone_archive_observatory") {
@@ -332,20 +298,14 @@
 
   # TODO(zra): In a Fuchsia build, use a prebuilt Observatory archive.
   archive_target = ":compressed_observatory_archive"
-  deps = [
-    archive_target,
-  ]
+  deps = [ archive_target ]
   archive_dir = get_label_info(archive_target, "target_gen_dir")
   archive_name = get_label_info(archive_target, "name")
   archive_file = "${archive_dir}/${archive_name}.tar"
 }
 
 source_set("standalone_observatory_archive") {
-  deps = [
-    ":standalone_archive_observatory",
-  ]
+  deps = [ ":standalone_archive_observatory" ]
 
-  sources = [
-    rebase_path("$target_gen_dir/standalone_archive_observatory.cc"),
-  ]
+  sources = [ rebase_path("$target_gen_dir/standalone_archive_observatory.cc") ]
 }
diff --git a/runtime/vm/compiler/compiler_sources.gni b/runtime/vm/compiler/compiler_sources.gni
index 9e8c300..d2b651c 100644
--- a/runtime/vm/compiler/compiler_sources.gni
+++ b/runtime/vm/compiler/compiler_sources.gni
@@ -100,14 +100,14 @@
   "compiler_state.h",
   "ffi/abi.cc",
   "ffi/abi.h",
-  "ffi/frame_rebase.cc",
-  "ffi/frame_rebase.h",
-  "ffi/marshaller.cc",
-  "ffi/marshaller.h",
   "ffi/call.cc",
   "ffi/call.h",
   "ffi/callback.cc",
   "ffi/callback.h",
+  "ffi/frame_rebase.cc",
+  "ffi/frame_rebase.h",
+  "ffi/marshaller.cc",
+  "ffi/marshaller.h",
   "ffi/native_calling_convention.cc",
   "ffi/native_calling_convention.h",
   "ffi/native_location.cc",
diff --git a/runtime/vm/heap/marker.cc b/runtime/vm/heap/marker.cc
index d353296..5455ea7 100644
--- a/runtime/vm/heap/marker.cc
+++ b/runtime/vm/heap/marker.cc
@@ -150,7 +150,7 @@
           size = raw_obj->VisitPointersNonvirtual(this);
         } else {
           RawWeakProperty* raw_weak = static_cast<RawWeakProperty*>(raw_obj);
-          size = ProcessWeakProperty(raw_weak);
+          size = ProcessWeakProperty(raw_weak, /* did_mark */ true);
         }
         marked_bytes_ += size;
 
@@ -196,13 +196,15 @@
     delayed_weak_properties_ = raw_weak;
   }
 
-  intptr_t ProcessWeakProperty(RawWeakProperty* raw_weak) {
+  intptr_t ProcessWeakProperty(RawWeakProperty* raw_weak, bool did_mark) {
     // The fate of the weak property is determined by its key.
     RawObject* raw_key = LoadPointerIgnoreRace(&raw_weak->ptr()->key_);
     if (raw_key->IsHeapObject() && raw_key->IsOldObject() &&
         !raw_key->IsMarked()) {
       // Key was white. Enqueue the weak property.
-      EnqueueWeakProperty(raw_weak);
+      if (did_mark) {
+        EnqueueWeakProperty(raw_weak);
+      }
       return raw_weak->HeapSize();
     }
     // Key is gray or black. Make the weak property black.
@@ -214,17 +216,18 @@
     while ((raw_obj = deferred_work_list_.Pop()) != NULL) {
       ASSERT(raw_obj->IsHeapObject() && raw_obj->IsOldObject());
       // N.B. We are scanning the object even if it is already marked.
+      bool did_mark = TryAcquireMarkBit(raw_obj);
       const intptr_t class_id = raw_obj->GetClassId();
       intptr_t size;
       if (class_id != kWeakPropertyCid) {
         size = raw_obj->VisitPointersNonvirtual(this);
       } else {
         RawWeakProperty* raw_weak = static_cast<RawWeakProperty*>(raw_obj);
-        size = ProcessWeakProperty(raw_weak);
+        size = ProcessWeakProperty(raw_weak, did_mark);
       }
       // Add the size only if we win the marking race to prevent
       // double-counting.
-      if (TryAcquireMarkBit(raw_obj)) {
+      if (did_mark) {
         marked_bytes_ += size;
       }
     }
diff --git a/runtime/vm/timeline.h b/runtime/vm/timeline.h
index 9849176..8e4199f 100644
--- a/runtime/vm/timeline.h
+++ b/runtime/vm/timeline.h
@@ -15,12 +15,9 @@
 #include "vm/os.h"
 #include "vm/os_thread.h"
 
-#if defined(FUCHSIA_SDK)
+#if defined(FUCHSIA_SDK) || defined (HOST_OS_FUCHSIA)
 #include <lib/trace-engine/context.h>
 #include <lib/trace-engine/instrumentation.h>
-#elif defined(HOST_OS_FUCHSIA)
-#include <trace-engine/context.h>
-#include <trace-engine/instrumentation.h>
 #elif defined(HOST_OS_MACOS)
 #include <os/availability.h>
 #include <os/signpost.h>
diff --git a/runtime/vm/timeline_fuchsia.cc b/runtime/vm/timeline_fuchsia.cc
index 3274603..5d119fc 100644
--- a/runtime/vm/timeline_fuchsia.cc
+++ b/runtime/vm/timeline_fuchsia.cc
@@ -4,13 +4,8 @@
 
 #include "vm/globals.h"
 #if defined(HOST_OS_FUCHSIA) && defined(SUPPORT_TIMELINE)
-#if defined(FUCHSIA_SDK)
 #include <lib/trace-engine/context.h>
 #include <lib/trace-engine/instrumentation.h>
-#else
-#include <trace-engine/context.h>
-#include <trace-engine/instrumentation.h>
-#endif  // defined(FUCHSIA_SDK)
 #include <zircon/syscalls.h>
 
 #include "platform/utils.h"
diff --git a/runtime/vm/vm_sources.gni b/runtime/vm/vm_sources.gni
index aede9a6..8f6e1f0 100644
--- a/runtime/vm/vm_sources.gni
+++ b/runtime/vm/vm_sources.gni
@@ -28,8 +28,8 @@
   "class_table.h",
   "clustered_snapshot.cc",
   "clustered_snapshot.h",
-  "code_comments.h",
   "code_comments.cc",
+  "code_comments.h",
   "code_descriptors.cc",
   "code_descriptors.h",
   "code_entry_kind.h",
@@ -103,9 +103,9 @@
   "exceptions.h",
   "ffi_callback_trampolines.cc",
   "ffi_callback_trampolines.h",
-  "finalizable_data.h",
   "field_table.cc",
   "field_table.h",
+  "finalizable_data.h",
   "fixed_cache.h",
   "flag_list.h",
   "flags.cc",
@@ -342,10 +342,10 @@
   "token_position.h",
   "type_table.h",
   "type_testing_stubs.cc",
+  "type_testing_stubs.h",
   "type_testing_stubs_arm.cc",
   "type_testing_stubs_arm64.cc",
   "type_testing_stubs_x64.cc",
-  "type_testing_stubs.h",
   "unibrow-inl.h",
   "unibrow.cc",
   "unibrow.h",
diff --git a/sdk/lib/_internal/vm/bin/socket_patch.dart b/sdk/lib/_internal/vm/bin/socket_patch.dart
index 11d166b..8d5bbe3 100644
--- a/sdk/lib/_internal/vm/bin/socket_patch.dart
+++ b/sdk/lib/_internal/vm/bin/socket_patch.dart
@@ -364,8 +364,12 @@
   // Holds the address used to connect or bind the socket.
   InternetAddress localAddress;
 
+  // The number of available bytes to read.
   int available = 0;
 
+  // The number of incoming connnections for Listening socket.
+  int connections = 0;
+
   int tokens = 0;
 
   bool sendReadEvents = false;
@@ -712,18 +716,30 @@
     }
     if (isClosing || isClosed) return null;
     try {
-      var length = count == null ? available : min(available, count);
-      if (length == 0) return null;
-      Uint8List list = nativeRead(length);
-      if (list != null) {
-        if (count == null) {
-          // If count is not specified, read as many bytes as possible.
-          // This checks remaining bytes, if available > 0, issue() in
-          // issueReadEvent() will keep reading.
+      var list;
+      if (count != null) {
+        list = nativeRead(count);
+      } else {
+        // If count is null, read as many bytes as possible.
+        // Loop here to ensure bytes that arrived while this read was
+        // issued are also read.
+        BytesBuilder builder = BytesBuilder();
+        do {
+          assert(available > 0);
+          list = nativeRead(available);
+          if (list == null) {
+            break;
+          }
+          builder.add(list);
           available = nativeAvailable();
+        } while (available > 0);
+        if (builder.isEmpty) {
+          list = null;
         } else {
-          available -= list.length;
+          list = builder.toBytes();
         }
+      }
+      if (list != null) {
         if (resourceInfo != null) {
           resourceInfo.totalRead += list.length;
         }
@@ -735,6 +751,7 @@
         _SocketProfile.collectStatistic(
             nativeGetSocketId(), _SocketProfileType.readBytes, list?.length);
       }
+      available = nativeAvailable();
       return list;
     } catch (e) {
       reportError(e, StackTrace.current, "Read failed");
@@ -849,8 +866,8 @@
   _NativeSocket accept() {
     // Don't issue accept if we're closing.
     if (isClosing || isClosed) return null;
-    assert(available > 0);
-    available--;
+    assert(connections > 0);
+    connections--;
     tokens++;
     returnTokens(listeningTokenBatchSize);
     var socket = new _NativeSocket.normal();
@@ -961,7 +978,7 @@
 
         if (i == readEvent) {
           if (isListening) {
-            available++;
+            connections++;
           } else {
             available = nativeAvailable();
             issueReadEvent();
@@ -1284,7 +1301,7 @@
         onPause: _onPauseStateChange,
         onResume: _onPauseStateChange);
     _socket.setHandlers(read: zone.bindCallbackGuarded(() {
-      while (_socket.available > 0) {
+      while (_socket.connections > 0) {
         var socket = _socket.accept();
         if (socket == null) return;
         if (!const bool.fromEnvironment("dart.vm.product")) {
diff --git a/sdk/lib/_internal/vm/lib/growable_array.dart b/sdk/lib/_internal/vm/lib/growable_array.dart
index a7757e9..6c0e327 100644
--- a/sdk/lib/_internal/vm/lib/growable_array.dart
+++ b/sdk/lib/_internal/vm/lib/growable_array.dart
@@ -373,18 +373,28 @@
   }
 
   List<T> toList({bool growable: true}) {
-    var length = this.length;
-    if (length > 0) {
-      List list = growable ? new _List(length) : new _List<T>(length);
-      for (int i = 0; i < length; i++) {
-        list[i] = this[i];
+    final length = this.length;
+    if (growable) {
+      if (length > 0) {
+        final list = new _List(length);
+        for (int i = 0; i < length; i++) {
+          list[i] = this[i];
+        }
+        final result = new _GrowableList<T>._withData(list);
+        result._setLength(length);
+        return result;
       }
-      if (!growable) return list;
-      var result = new _GrowableList<T>._withData(list);
-      result._setLength(length);
-      return result;
+      return <T>[];
+    } else {
+      if (length > 0) {
+        final list = new _List<T>(length);
+        for (int i = 0; i < length; i++) {
+          list[i] = this[i];
+        }
+        return list;
+      }
+      return new List<T>(0);
     }
-    return growable ? <T>[] : new List<T>(0);
   }
 
   Set<T> toSet() {
diff --git a/sdk/lib/ffi/ffi_sources.gni b/sdk/lib/ffi/ffi_sources.gni
index d2bb279..5b34b9c 100644
--- a/sdk/lib/ffi/ffi_sources.gni
+++ b/sdk/lib/ffi/ffi_sources.gni
@@ -9,5 +9,5 @@
   "annotations.dart",
   "dynamic_library.dart",
   "native_type.dart",
-  "struct.dart"
+  "struct.dart",
 ]
diff --git a/sdk/lib/internal/internal_sources.gni b/sdk/lib/internal/internal_sources.gni
index 4311341..8510ab2 100644
--- a/sdk/lib/internal/internal_sources.gni
+++ b/sdk/lib/internal/internal_sources.gni
@@ -11,8 +11,8 @@
   "cast.dart",
   "errors.dart",
   "iterable.dart",
-  "list.dart",
   "linked_list.dart",
+  "list.dart",
   "print.dart",
   "sort.dart",
   "symbol.dart",
diff --git a/sdk/lib/io/io_sources.gni b/sdk/lib/io/io_sources.gni
index 308dd94..59b2ca9 100644
--- a/sdk/lib/io/io_sources.gni
+++ b/sdk/lib/io/io_sources.gni
@@ -17,8 +17,8 @@
   "file_impl.dart",
   "file_system_entity.dart",
   "io_resource_info.dart",
-  "io_sink.dart",
   "io_service.dart",
+  "io_sink.dart",
   "link.dart",
   "namespace_impl.dart",
   "network_profiling.dart",
@@ -26,10 +26,10 @@
   "platform.dart",
   "platform_impl.dart",
   "process.dart",
-  "service_object.dart",
   "secure_server_socket.dart",
   "secure_socket.dart",
   "security_context.dart",
+  "service_object.dart",
   "socket.dart",
   "stdio.dart",
   "string_transformer.dart",
diff --git a/sdk/lib/typed_data/typed_data_sources.gni b/sdk/lib/typed_data/typed_data_sources.gni
index 23ba0f0..00459f3 100644
--- a/sdk/lib/typed_data/typed_data_sources.gni
+++ b/sdk/lib/typed_data/typed_data_sources.gni
@@ -4,6 +4,7 @@
 
 typed_data_sdk_sources = [
   "typed_data.dart",
+
   # The above file needs to be first if additional parts are added to the lib.
   "unmodifiable_typed_data.dart",
 ]
diff --git a/sdk/lib/vmservice/vmservice_sources.gni b/sdk/lib/vmservice/vmservice_sources.gni
index b8cf5bf..742f6e8 100644
--- a/sdk/lib/vmservice/vmservice_sources.gni
+++ b/sdk/lib/vmservice/vmservice_sources.gni
@@ -11,9 +11,9 @@
   "client.dart",
   "constants.dart",
   "devfs.dart",
-  "running_isolate.dart",
-  "running_isolates.dart",
   "message.dart",
   "message_router.dart",
   "named_lookup.dart",
+  "running_isolate.dart",
+  "running_isolates.dart",
 ]
diff --git a/sdk/lib/wasm/wasm_sources.gni b/sdk/lib/wasm/wasm_sources.gni
index dcd359a..e63af2d 100644
--- a/sdk/lib/wasm/wasm_sources.gni
+++ b/sdk/lib/wasm/wasm_sources.gni
@@ -2,6 +2,4 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
-wasm_sdk_sources = [
-  "wasm.dart",
-]
+wasm_sdk_sources = [ "wasm.dart" ]
diff --git a/sdk_nnbd/lib/_internal/js_dev_runtime/private/ddc_runtime/classes.dart b/sdk_nnbd/lib/_internal/js_dev_runtime/private/ddc_runtime/classes.dart
index 86c0b65..39944a0 100644
--- a/sdk_nnbd/lib/_internal/js_dev_runtime/private/ddc_runtime/classes.dart
+++ b/sdk_nnbd/lib/_internal/js_dev_runtime/private/ddc_runtime/classes.dart
@@ -573,6 +573,9 @@
 addTypeCaches(type) {
   JS('', '#[#] = void 0', type, _cachedLegacy);
   JS('', '#[#] = void 0', type, _cachedNullable);
+  var subtypeCacheMap = JS<Object>('!', 'new Map()');
+  JS('', '#[#] = #', type, _subtypeCache, subtypeCacheMap);
+  JS('', '#.push(#)', _cacheMaps, subtypeCacheMap);
 }
 
 // TODO(jmesserly): should we do this for all interfaces?
diff --git a/sdk_nnbd/lib/_internal/js_dev_runtime/private/ddc_runtime/types.dart b/sdk_nnbd/lib/_internal/js_dev_runtime/private/ddc_runtime/types.dart
index 4f5a6e2..77affd3 100644
--- a/sdk_nnbd/lib/_internal/js_dev_runtime/private/ddc_runtime/types.dart
+++ b/sdk_nnbd/lib/_internal/js_dev_runtime/private/ddc_runtime/types.dart
@@ -273,6 +273,9 @@
 /// A javascript Symbol used to store a canonical version of T* on T.
 final _cachedLegacy = JS('', 'Symbol("cachedLegacy")');
 
+/// A javascript Symbol used to store prior subtype checks and their results.
+final _subtypeCache = JS('', 'Symbol("_subtypeCache")');
+
 /// Returns a nullable (question, ?) version of [type].
 ///
 /// The resulting type returned in a normalized form based on the rules from the
@@ -407,7 +410,7 @@
 }
 
 @JSExportName('Never')
-final never_ = NeverType();
+final _never = NeverType();
 
 @JSExportName('dynamic')
 final _dynamic = DynamicType();
@@ -429,7 +432,7 @@
 @JSExportName('void')
 final void_ = VoidType();
 
-// TODO(nshahan): Cleanup and consolidate NeverType, BottomType, bottom, never_.
+// TODO(nshahan): Cleanup and consolidate NeverType, BottomType, bottom, _never.
 class BottomType extends DartType {
   toString() => 'bottom';
 }
@@ -1235,17 +1238,9 @@
 bool isSubtypeOf(Object t1, Object t2) {
   // TODO(jmesserly): we've optimized `is`/`as`/implicit type checks, so they're
   // dispatched on the type. Can we optimize the subtype relation too?
-  // TODO: Find a way to eagerly attach this cache to the Null object at
-  // compile-time so we can remove the top-level null comparison cache entirely.
-  Object map;
-  if (JS('!', '!#.hasOwnProperty(#)', t1, _subtypeCache)) {
-    JS('', '#[#] = #', t1, _subtypeCache, map = JS<Object>('!', 'new Map()'));
-    _cacheMaps.add(map);
-  } else {
-    map = JS<Object>('!', '#[#]', t1, _subtypeCache);
-    bool result = JS('', '#.get(#)', map, t2);
-    if (JS('!', '# !== void 0', result)) return result;
-  }
+  var map = JS<Object>('!', '#[#]', t1, _subtypeCache);
+  bool result = JS('', '#.get(#)', map, t2);
+  if (JS('!', '# !== void 0', result)) return result;
 
   var validSubtype = _isSubtype(t1, t2, true);
   if (!validSubtype && !_strictSubtypeChecks) {
@@ -1261,8 +1256,6 @@
   return validSubtype;
 }
 
-final _subtypeCache = JS('', 'Symbol("_subtypeCache")');
-
 @notNull
 bool _isBottom(type, @notNull bool strictMode) =>
     _equalType(type, Never) || (!strictMode && _equalType(type, Null));
diff --git a/sdk_nnbd/lib/_internal/vm/bin/socket_patch.dart b/sdk_nnbd/lib/_internal/vm/bin/socket_patch.dart
index 95a5efe..070a146 100644
--- a/sdk_nnbd/lib/_internal/vm/bin/socket_patch.dart
+++ b/sdk_nnbd/lib/_internal/vm/bin/socket_patch.dart
@@ -364,8 +364,12 @@
   // Holds the address used to connect or bind the socket.
   late InternetAddress localAddress;
 
+  // The number of available bytes to read.
   int available = 0;
 
+  // The number of incoming connnections for Listening socket.
+  int connections = 0;
+
   int tokens = 0;
 
   bool sendReadEvents = false;
@@ -711,23 +715,35 @@
     }
     if (isClosing || isClosed) return null;
     try {
-      var length = count == null ? available : min(available, count);
-      if (length == 0) return null;
-      Uint8List? list = nativeRead(length);
+      Uint8List? list;
+      if (count != null) {
+        list = nativeRead(count);
+      } else {
+        // If count is null, read as many bytes as possible.
+        // Loop here to ensure bytes that arrived while this read was
+        // issued are also read.
+        BytesBuilder builder = BytesBuilder();
+        do {
+          assert(available > 0);
+          list = nativeRead(available);
+          if (list == null) {
+            break;
+          }
+          builder.add(list);
+          available = nativeAvailable();
+        } while (available > 0);
+        if (builder.isEmpty) {
+          list = null;
+        } else {
+          list = builder.toBytes();
+        }
+      }
       final resourceInformation = resourceInfo;
       assert(resourceInformation != null ||
           isPipe ||
           isInternal ||
           isInternalSignal);
       if (list != null) {
-        if (count == null) {
-          // If count is not specified, read as many bytes as possible.
-          // This checks remaining bytes, if available > 0, issue() in
-          // issueReadEvent() will keep reading.
-          available = nativeAvailable();
-        } else {
-          available -= list.length;
-        }
         if (resourceInformation != null) {
           resourceInformation.totalRead += list.length;
         }
@@ -739,6 +755,7 @@
         _SocketProfile.collectStatistic(
             nativeGetSocketId(), _SocketProfileType.readBytes, list?.length);
       }
+      available = nativeAvailable();
       return list;
     } catch (e) {
       reportError(e, StackTrace.current, "Read failed");
@@ -866,8 +883,8 @@
   _NativeSocket? accept() {
     // Don't issue accept if we're closing.
     if (isClosing || isClosed) return null;
-    assert(available > 0);
-    available--;
+    assert(connections > 0);
+    connections--;
     tokens++;
     returnTokens(listeningTokenBatchSize);
     var socket = new _NativeSocket.normal();
@@ -981,7 +998,7 @@
 
         if (i == readEvent) {
           if (isListening) {
-            available++;
+            connections++;
           } else {
             available = nativeAvailable();
             issueReadEvent();
@@ -1311,7 +1328,7 @@
         onPause: _onPauseStateChange,
         onResume: _onPauseStateChange);
     _socket.setHandlers(read: zone.bindCallbackGuarded(() {
-      while (_socket.available > 0) {
+      while (_socket.connections > 0) {
         var socket = _socket.accept();
         if (socket == null) return;
         if (!const bool.fromEnvironment("dart.vm.product")) {
diff --git a/sdk_nnbd/lib/_internal/vm/lib/growable_array.dart b/sdk_nnbd/lib/_internal/vm/lib/growable_array.dart
index 9e2d4ac..5105075 100644
--- a/sdk_nnbd/lib/_internal/vm/lib/growable_array.dart
+++ b/sdk_nnbd/lib/_internal/vm/lib/growable_array.dart
@@ -373,18 +373,28 @@
   }
 
   List<T> toList({bool growable: true}) {
-    var length = this.length;
-    if (length > 0) {
-      final list = new _List<T>(length);
-      for (int i = 0; i < length; i++) {
-        list[i] = this[i];
+    final length = this.length;
+    if (growable) {
+      if (length > 0) {
+        final list = new _List(length);
+        for (int i = 0; i < length; i++) {
+          list[i] = this[i];
+        }
+        final result = new _GrowableList<T>._withData(list);
+        result._setLength(length);
+        return result;
       }
-      if (!growable) return list;
-      final result = new _GrowableList<T>._withData(list);
-      result._setLength(length);
-      return result;
+      return <T>[];
+    } else {
+      if (length > 0) {
+        final list = new _List<T>(length);
+        for (int i = 0; i < length; i++) {
+          list[i] = this[i];
+        }
+        return list;
+      }
+      return List<T>.empty(growable: false);
     }
-    return growable ? <T>[] : List<T>.empty(growable: growable);
   }
 
   Set<T> toSet() {
diff --git a/sdk_nnbd/lib/async/stream.dart b/sdk_nnbd/lib/async/stream.dart
index 565b9f4..3969f20 100644
--- a/sdk_nnbd/lib/async/stream.dart
+++ b/sdk_nnbd/lib/async/stream.dart
@@ -837,7 +837,7 @@
    * the returned future is completed with that error,
    * and processing stops.
    */
-  Future<bool> contains(Object needle) {
+  Future<bool> contains(Object? needle) {
     _Future<bool> future = new _Future<bool>();
     StreamSubscription<T> subscription =
         this.listen(null, onError: future._completeError, onDone: () {
diff --git a/sdk_nnbd/lib/ffi/ffi_sources.gni b/sdk_nnbd/lib/ffi/ffi_sources.gni
index d2bb279..5b34b9c 100644
--- a/sdk_nnbd/lib/ffi/ffi_sources.gni
+++ b/sdk_nnbd/lib/ffi/ffi_sources.gni
@@ -9,5 +9,5 @@
   "annotations.dart",
   "dynamic_library.dart",
   "native_type.dart",
-  "struct.dart"
+  "struct.dart",
 ]
diff --git a/sdk_nnbd/lib/internal/internal_sources.gni b/sdk_nnbd/lib/internal/internal_sources.gni
index 4311341..8510ab2 100644
--- a/sdk_nnbd/lib/internal/internal_sources.gni
+++ b/sdk_nnbd/lib/internal/internal_sources.gni
@@ -11,8 +11,8 @@
   "cast.dart",
   "errors.dart",
   "iterable.dart",
-  "list.dart",
   "linked_list.dart",
+  "list.dart",
   "print.dart",
   "sort.dart",
   "symbol.dart",
diff --git a/sdk_nnbd/lib/io/io_sources.gni b/sdk_nnbd/lib/io/io_sources.gni
index 308dd94..59b2ca9 100644
--- a/sdk_nnbd/lib/io/io_sources.gni
+++ b/sdk_nnbd/lib/io/io_sources.gni
@@ -17,8 +17,8 @@
   "file_impl.dart",
   "file_system_entity.dart",
   "io_resource_info.dart",
-  "io_sink.dart",
   "io_service.dart",
+  "io_sink.dart",
   "link.dart",
   "namespace_impl.dart",
   "network_profiling.dart",
@@ -26,10 +26,10 @@
   "platform.dart",
   "platform_impl.dart",
   "process.dart",
-  "service_object.dart",
   "secure_server_socket.dart",
   "secure_socket.dart",
   "security_context.dart",
+  "service_object.dart",
   "socket.dart",
   "stdio.dart",
   "string_transformer.dart",
diff --git a/sdk_nnbd/lib/typed_data/typed_data_sources.gni b/sdk_nnbd/lib/typed_data/typed_data_sources.gni
index 23ba0f0..00459f3 100644
--- a/sdk_nnbd/lib/typed_data/typed_data_sources.gni
+++ b/sdk_nnbd/lib/typed_data/typed_data_sources.gni
@@ -4,6 +4,7 @@
 
 typed_data_sdk_sources = [
   "typed_data.dart",
+
   # The above file needs to be first if additional parts are added to the lib.
   "unmodifiable_typed_data.dart",
 ]
diff --git a/sdk_nnbd/lib/vmservice/vmservice_sources.gni b/sdk_nnbd/lib/vmservice/vmservice_sources.gni
index b8cf5bf..742f6e8 100644
--- a/sdk_nnbd/lib/vmservice/vmservice_sources.gni
+++ b/sdk_nnbd/lib/vmservice/vmservice_sources.gni
@@ -11,9 +11,9 @@
   "client.dart",
   "constants.dart",
   "devfs.dart",
-  "running_isolate.dart",
-  "running_isolates.dart",
   "message.dart",
   "message_router.dart",
   "named_lookup.dart",
+  "running_isolate.dart",
+  "running_isolates.dart",
 ]
diff --git a/sdk_nnbd/lib/wasm/wasm_sources.gni b/sdk_nnbd/lib/wasm/wasm_sources.gni
index dcd359a..e63af2d 100644
--- a/sdk_nnbd/lib/wasm/wasm_sources.gni
+++ b/sdk_nnbd/lib/wasm/wasm_sources.gni
@@ -2,6 +2,4 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
-wasm_sdk_sources = [
-  "wasm.dart",
-]
+wasm_sdk_sources = [ "wasm.dart" ]
diff --git a/tests/compiler/dartdevc_native/nnbd_strong_subtype_test.dart b/tests/compiler/dartdevc_native/nnbd_strong_subtype_test.dart
index 836441f..afe9afa 100644
--- a/tests/compiler/dartdevc_native/nnbd_strong_subtype_test.dart
+++ b/tests/compiler/dartdevc_native/nnbd_strong_subtype_test.dart
@@ -38,29 +38,29 @@
 
   // Bottom is subtype of top.
   // never <: dynamic
-  checkProperSubtype(neverType, dynamic);
+  checkProperSubtype(Never, dynamic);
   // never <: void
-  checkProperSubtype(neverType, voidType);
+  checkProperSubtype(Never, voidType);
   // never <: Object?
-  checkProperSubtype(neverType, nullable(Object));
+  checkProperSubtype(Never, nullable(Object));
 
   // Object is between top and bottom.
   // Object <: Object?
   checkProperSubtype(Object, nullable(Object));
   // never <: Object
-  checkProperSubtype(neverType, Object);
+  checkProperSubtype(Never, Object);
 
   // Null is between top and bottom.
   // Null <: Object?
   checkProperSubtype(Null, nullable(Object));
   // never <: Null
-  checkProperSubtype(neverType, Null);
+  checkProperSubtype(Never, Null);
 
   // Class is between Object and bottom.
   // A <: Object
   checkProperSubtype(A, dynamic);
   // never <: A
-  checkProperSubtype(neverType, A);
+  checkProperSubtype(Never, A);
 
   // Nullable types are a union of T and Null.
   // A <: A?
@@ -83,7 +83,7 @@
   // Null <: Object*
   checkSubtype(Null, legacy(Object));
   // never <: Object*
-  checkSubtype(neverType, legacy(Object));
+  checkSubtype(Never, legacy(Object));
   // A* <: A
   checkSubtype(legacy(A), A);
   // A <: A*
@@ -99,7 +99,7 @@
   // Null <: A*
   checkProperSubtype(Null, legacy(A));
   // never <: A*
-  checkProperSubtype(neverType, legacy(A));
+  checkProperSubtype(Never, legacy(A));
 
   // Futures.
   // Null <: FutureOr<Object?>
@@ -122,7 +122,7 @@
   checkProperSubtype(
       generic1(Future, nullable(Object)), futureOrOf(nullable(Object)));
   // FutureOr<Never> <: Future<Never>
-  checkSubtype(futureOrOf(neverType), generic1(Future, neverType));
+  checkSubtype(futureOrOf(Never), generic1(Future, Never));
   // Future<B> <: FutureOr<A>
   checkProperSubtype(generic1(Future, B), futureOrOf(A));
   // B <: <: FutureOr<A>
@@ -271,7 +271,7 @@
   // A? <\: A
   checkSubtypeFailure(nullable(A), A);
   // Null <\: never
-  checkSubtypeFailure(Null, neverType);
+  checkSubtypeFailure(Null, Never);
   // Null <\: Object
   checkSubtypeFailure(Null, Object);
   // Null <\: A
diff --git a/tests/compiler/dartdevc_native/nnbd_type_normalization_test.dart b/tests/compiler/dartdevc_native/nnbd_type_normalization_test.dart
index 825caaf..6946585 100644
--- a/tests/compiler/dartdevc_native/nnbd_type_normalization_test.dart
+++ b/tests/compiler/dartdevc_native/nnbd_type_normalization_test.dart
@@ -24,7 +24,7 @@
   // Null? == Null
   Expect.identical(nullable(Null), Null);
   // Never? == Null
-  Expect.identical(nullable(dart.wrapType(dart.never_)), Null);
+  Expect.identical(nullable(Never), Null);
   // dynamic? == dynamic
   Expect.identical(nullable(dynamic), dynamic);
   // void? == void
diff --git a/tests/compiler/dartdevc_native/nnbd_weak_subtype_test.dart b/tests/compiler/dartdevc_native/nnbd_weak_subtype_test.dart
index 3d14135..9160e7a 100644
--- a/tests/compiler/dartdevc_native/nnbd_weak_subtype_test.dart
+++ b/tests/compiler/dartdevc_native/nnbd_weak_subtype_test.dart
@@ -38,29 +38,29 @@
 
   // Bottom is subtype of top.
   // never <: dynamic
-  checkProperSubtype(neverType, dynamic);
+  checkProperSubtype(Never, dynamic);
   // never <: void
-  checkProperSubtype(neverType, voidType);
+  checkProperSubtype(Never, voidType);
   // never <: Object?
-  checkProperSubtype(neverType, nullable(Object));
+  checkProperSubtype(Never, nullable(Object));
 
   // Object is between top and bottom.
   // Object <: Object?
   checkSubtype(Object, nullable(Object));
   // never <: Object
-  checkProperSubtype(neverType, Object);
+  checkProperSubtype(Never, Object);
 
   // Null is between top and bottom.
   // Null <: Object?
   checkProperSubtype(Null, nullable(Object));
   // never <: Null
-  checkSubtype(neverType, Null);
+  checkSubtype(Never, Null);
 
   // Class is between Object and bottom.
   // A <: Object
   checkProperSubtype(A, dynamic);
   // never <: A
-  checkProperSubtype(neverType, A);
+  checkProperSubtype(Never, A);
 
   // Nullable types are a union of T and Null.
   // A <: A?
@@ -83,7 +83,7 @@
   // Null <: Object*
   checkSubtype(Null, legacy(Object));
   // never <: Object*
-  checkSubtype(neverType, legacy(Object));
+  checkSubtype(Never, legacy(Object));
   // A* <: A
   checkSubtype(legacy(A), A);
   // A <: A*
@@ -99,7 +99,7 @@
   // Null <: A*
   checkProperSubtype(Null, legacy(A));
   // never <: A*
-  checkProperSubtype(neverType, legacy(A));
+  checkProperSubtype(Never, legacy(A));
 
   // Futures.
   // Null <: FutureOr<Object?>
@@ -122,7 +122,7 @@
   checkProperSubtype(
       generic1(Future, nullable(Object)), futureOrOf(nullable(Object)));
   // FutureOr<Never> <: Future<Never>
-  checkSubtype(futureOrOf(neverType), generic1(Future, neverType));
+  checkSubtype(futureOrOf(Never), generic1(Future, Never));
   // Future<B> <: FutureOr<A>
   checkProperSubtype(generic1(Future, B), futureOrOf(A));
   // B <: <: FutureOr<A>
@@ -271,7 +271,7 @@
   // A? <: A
   checkSubtype(nullable(A), A);
   // Null <: never
-  checkSubtype(Null, neverType);
+  checkSubtype(Null, Never);
   // Null <: Object
   checkProperSubtype(Null, Object);
   // Null <: A
diff --git a/tests/compiler/dartdevc_native/runtime_utils_nnbd.dart b/tests/compiler/dartdevc_native/runtime_utils_nnbd.dart
index 69fcdc0..47dd2bc 100644
--- a/tests/compiler/dartdevc_native/runtime_utils_nnbd.dart
+++ b/tests/compiler/dartdevc_native/runtime_utils_nnbd.dart
@@ -7,9 +7,6 @@
 
 import 'package:expect/expect.dart';
 
-/// The runtime representation of the never type.
-final neverType = dart.wrapType(dart.never_);
-
 /// Unwrap the user code type representation to expose the runtime
 /// representation of [t].
 ///
diff --git a/tests/language/nnbd/resolution/null_aware_subscript_produces_nullable_type_test.dart b/tests/language/nnbd/resolution/null_aware_subscript_produces_nullable_type_test.dart
new file mode 100644
index 0000000..ed8823d
--- /dev/null
+++ b/tests/language/nnbd/resolution/null_aware_subscript_produces_nullable_type_test.dart
@@ -0,0 +1,70 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+void main() {}
+
+void f1(NotGeneric x) {
+  x[0] + 1;
+  x[0] = 1;
+  useNonNullable(x[0] = 1);
+  x[0] += 1;
+  useNonNullable(x[0] += 1);
+  x[0]++;
+  useNonNullable(x[0]++);
+  ++x[0];
+  useNonNullable(++x[0]);
+}
+
+void f2(NotGeneric? x) {
+  x?[0] + 1;
+//^^^^^^
+// [analyzer] STATIC_WARNING.USE_OF_NULLABLE_VALUE
+// [cfe] unspecified
+  x?[0] = 1;
+  useNonNullable(x?[0] = 1);
+//               ^^^^^^^^^^
+// [analyzer] STATIC_WARNING.ARGUMENT_TYPE_NOT_ASSIGNABLE
+// [cfe] unspecified
+  x?[0] += 1;
+  useNonNullable(x?[0] += 1);
+//               ^^^^^^^^^^^
+// [analyzer] STATIC_WARNING.ARGUMENT_TYPE_NOT_ASSIGNABLE
+// [cfe] unspecified
+  x?[0]++;
+  useNonNullable(x?[0]++);
+//               ^^^^^^^^^^^
+// [analyzer] STATIC_WARNING.ARGUMENT_TYPE_NOT_ASSIGNABLE
+// [cfe] unspecified
+  ++x?[0];
+  useNonNullable(++x?[0]);
+//               ^^^^^^^^^^^
+// [analyzer] STATIC_WARNING.ARGUMENT_TYPE_NOT_ASSIGNABLE
+// [cfe] unspecified
+}
+
+void f3<T extends num>(Generic<T>? x) {
+  x?[0] + 1;
+//^^^^^^
+// [analyzer] STATIC_WARNING.USE_OF_NULLABLE_VALUE
+// [cfe] unspecified
+}
+
+void f4<T extends num>(Generic<T?> x) {
+  x[0] + 1;
+//^^^^
+// [analyzer] STATIC_WARNING.USE_OF_NULLABLE_VALUE
+// [cfe] unspecified
+}
+
+class NotGeneric {
+  int operator [](int index) => throw 'unreachable';
+  void operator []=(int index, int value) => throw 'unreachable';
+}
+
+class Generic<T> {
+  T operator [](int index) => throw 'unreachable';
+  void operator []=(int index, T value) => throw 'unreachable';
+}
+
+void useNonNullable(int a) {}
diff --git a/tests/language/nnbd/resolution/question_dot_index_produces_nullable_type_test.dart b/tests/language/nnbd/resolution/question_dot_index_produces_nullable_type_test.dart
deleted file mode 100644
index aac6c33..0000000
--- a/tests/language/nnbd/resolution/question_dot_index_produces_nullable_type_test.dart
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// SharedOptions=--enable-experiment=non-nullable
-
-void main() {}
-
-void f1(NotGeneric x) {
-  x[0] + 1; //# 01: ok
-  x[0] = 1; //# 02: ok
-  useNonNullable(x[0] = 1); //# 03: ok
-  x[0] += 1; //# 04: ok
-  useNonNullable(x[0] += 1); //# 05: ok
-}
-
-void f2(NotGeneric? x) {
-  x?.[0] + 1; //# 06: compile-time error
-  x?.[0] = 1; //# 07: ok
-  useNonNullable(x?.[0] = 1); //# 08: compile-time error
-  x?.[0] += 1; //# 09: ok
-  useNonNullable(x?.[0] += 1); //# 10: compile-time error
-}
-
-void f3<T extends num>(Generic<T>? x) {
-  x?.[0] + 1; //# 11: compile-time error
-}
-
-void f4<T extends num>(Generic<T?> x) {
-  x[0] + 1; //# 12: compile-time error
-}
-
-class NotGeneric {
-  int operator[](int index) => throw 'unreachable';
-  void operator[]=(int index, int value) => throw 'unreachable';
-}
-
-class Generic<T> {
-  T operator[](int index) => throw 'unreachable';
-  void operator[]=(int index, T value) => throw 'unreachable';
-}
-
-void useNonNullable(int a) {}
diff --git a/tests/language/nnbd/syntax/class_member_declarations_error_test.dart b/tests/language/nnbd/syntax/class_member_declarations_error_test.dart
index 59f708f..2229199 100644
--- a/tests/language/nnbd/syntax/class_member_declarations_error_test.dart
+++ b/tests/language/nnbd/syntax/class_member_declarations_error_test.dart
@@ -54,11 +54,15 @@
   //   ^^^^^^^^^
   // [analyzer] SYNTACTIC_ERROR.MODIFIER_OUT_OF_ORDER
   // [cfe] The modifier 'covariant' should be before the modifier 'late'.
+  //             ^^^
+  // [analyzer] SYNTACTIC_ERROR.MISSING_CONST_FINAL_VAR_OR_TYPE
   late covariant x20 = '';
   //   ^^^^^^^^^
   // [analyzer] SYNTACTIC_ERROR.MODIFIER_OUT_OF_ORDER
   // [cfe] The modifier 'covariant' should be before the modifier 'late'.
-
+  //             ^^^
+  // [analyzer] SYNTACTIC_ERROR.MISSING_CONST_FINAL_VAR_OR_TYPE
+  
   covariant var late x21;
   //            ^^^^
   // [analyzer] SYNTACTIC_ERROR.MODIFIER_OUT_OF_ORDER
diff --git a/tests/lib/async/stack_trace03_test.dart b/tests/lib/async/stack_trace03_test.dart
index e5ab27b..47eb864 100644
--- a/tests/lib/async/stack_trace03_test.dart
+++ b/tests/lib/async/stack_trace03_test.dart
@@ -12,7 +12,7 @@
   var f = new Future(() {
     throw "foo";
   });
-  f.then((_) => 499).catchError((e, st) {
+  f.then<Object?>((_) => 499).catchError((e, st) {
     Expect.equals("foo", e);
     Expect.isNotNull(st);
     asyncEnd();
diff --git a/tests/lib_2/html/canvasrendering/arc_test.dart b/tests/lib_2/html/canvasrendering/arc_test.dart
index c005459..d60fb1e 100644
--- a/tests/lib_2/html/canvasrendering/arc_test.dart
+++ b/tests/lib_2/html/canvasrendering/arc_test.dart
@@ -8,7 +8,7 @@
 import 'dart:math';
 
 import 'canvas_rendering_util.dart';
-import 'package:unittest/unittest.dart';
+import 'package:expect/minitest.dart';
 
 main() {
   setUp(setupFunc);
diff --git a/tests/lib_2/html/canvasrendering/canvas_rendering_util.dart b/tests/lib_2/html/canvasrendering/canvas_rendering_util.dart
index 342178b..037da9e 100644
--- a/tests/lib_2/html/canvasrendering/canvas_rendering_util.dart
+++ b/tests/lib_2/html/canvasrendering/canvas_rendering_util.dart
@@ -7,7 +7,7 @@
 import 'dart:html';
 import 'dart:math';
 
-import 'package:unittest/unittest.dart';
+import 'package:expect/minitest.dart';
 
 // Some rounding errors in the browsers.
 checkPixel(List<int> pixel, List<int> expected) {
diff --git a/tests/lib_2/html/canvasrendering/draw_image_canvas_element_test.dart b/tests/lib_2/html/canvasrendering/draw_image_canvas_element_test.dart
index 2f47f31..942c8f6 100644
--- a/tests/lib_2/html/canvasrendering/draw_image_canvas_element_test.dart
+++ b/tests/lib_2/html/canvasrendering/draw_image_canvas_element_test.dart
@@ -8,7 +8,7 @@
 import 'dart:math';
 
 import 'canvas_rendering_util.dart';
-import 'package:unittest/unittest.dart';
+import 'package:expect/minitest.dart';
 
 main() {
   setUp(setupFunc);
diff --git a/tests/lib_2/html/canvasrendering/fill_text_test.dart b/tests/lib_2/html/canvasrendering/fill_text_test.dart
index 9073bce..fe44d25 100644
--- a/tests/lib_2/html/canvasrendering/fill_text_test.dart
+++ b/tests/lib_2/html/canvasrendering/fill_text_test.dart
@@ -8,7 +8,7 @@
 import 'dart:math';
 
 import 'canvas_rendering_util.dart';
-import 'package:unittest/unittest.dart';
+import 'package:expect/minitest.dart';
 
 main() {
   setUp(setupFunc);
diff --git a/tests/lib_2/html/canvasrendering/pixel_manipulation_test.dart b/tests/lib_2/html/canvasrendering/pixel_manipulation_test.dart
index 68fa647..586072a 100644
--- a/tests/lib_2/html/canvasrendering/pixel_manipulation_test.dart
+++ b/tests/lib_2/html/canvasrendering/pixel_manipulation_test.dart
@@ -8,7 +8,7 @@
 import 'dart:math';
 
 import 'canvas_rendering_util.dart';
-import 'package:unittest/unittest.dart';
+import 'package:expect/minitest.dart';
 
 main() {
   setUp(setupFunc);
diff --git a/third_party/llvm/BUILD.gn b/third_party/llvm/BUILD.gn
index 7442423..bb18f60 100644
--- a/third_party/llvm/BUILD.gn
+++ b/third_party/llvm/BUILD.gn
@@ -23,27 +23,19 @@
 }
 
 llvm_library("LLVMSupport") {
-  deps = [
-    ":LLVMDemangle",
-  ]
+  deps = [ ":LLVMDemangle" ]
 }
 
 llvm_library("LLVMAArch64Utils") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMBinaryFormat") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMDebugInfoMSF") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMDebugInfoCodeView") {
@@ -70,9 +62,7 @@
 }
 
 llvm_library("LLVMAArch64Info") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMAArch64Desc") {
@@ -308,9 +298,7 @@
 }
 
 llvm_library("LLVMAMDGPUInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMAMDGPUDesc") {
@@ -441,9 +429,7 @@
 }
 
 llvm_library("LLVMARCInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMARCDesc") {
@@ -481,9 +467,7 @@
 }
 
 llvm_library("LLVMARMUtils") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMARMAsmPrinter") {
@@ -495,9 +479,7 @@
 }
 
 llvm_library("LLVMARMInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMARMDesc") {
@@ -615,9 +597,7 @@
 }
 
 llvm_library("LLVMBPFInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMBPFDesc") {
@@ -701,9 +681,7 @@
 }
 
 llvm_library("LLVMOption") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMDlltoolDriver") {
@@ -757,9 +735,7 @@
 }
 
 llvm_library("LLVMHexagonInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMHexagonDesc") {
@@ -867,9 +843,7 @@
 }
 
 llvm_library("LLVMLanaiInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMLanaiAsmPrinter") {
@@ -937,9 +911,7 @@
 }
 
 llvm_library("LLVMLineEditor") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMMIRParser") {
@@ -962,9 +934,7 @@
 }
 
 llvm_library("LLVMMSP430Info") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMMSP430Desc") {
@@ -999,9 +969,7 @@
 }
 
 llvm_library("LLVMMipsInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMMipsDesc") {
@@ -1056,9 +1024,7 @@
 }
 
 llvm_library("LLVMNVPTXInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMNVPTXDesc") {
@@ -1106,9 +1072,7 @@
 }
 
 llvm_library("LLVMX86Info") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMX86Desc") {
@@ -1148,9 +1112,7 @@
 }
 
 llvm_library("LLVMNios2Info") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMNios2Desc") {
@@ -1205,9 +1167,7 @@
 }
 
 llvm_library("LLVMPowerPCInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMPowerPCDesc") {
@@ -1263,9 +1223,7 @@
 }
 
 llvm_library("LLVMRISCVInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMRISCVDesc") {
@@ -1318,9 +1276,7 @@
 }
 
 llvm_library("LLVMSparcInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMSparcDesc") {
@@ -1383,9 +1339,7 @@
 }
 
 llvm_library("LLVMSystemZInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMSystemZDesc") {
@@ -1435,21 +1389,15 @@
 }
 
 llvm_library("LLVMTableGen") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMTestingSupport") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMWebAssemblyInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMWebAssemblyAsmParser") {
@@ -1504,9 +1452,7 @@
 }
 
 llvm_library("LLVMWindowsManifest") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMX86AsmParser") {
@@ -1536,9 +1482,7 @@
 }
 
 llvm_library("LLVMXCoreInfo") {
-  deps = [
-    ":LLVMSupport",
-  ]
+  deps = [ ":LLVMSupport" ]
 }
 
 llvm_library("LLVMXCoreDesc") {
diff --git a/tools/VERSION b/tools/VERSION
index 62b6ed6..94e07ba 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -33,7 +33,7 @@
 MAJOR 2
 MINOR 8
 PATCH 0
-PRERELEASE 13
+PRERELEASE 14
 PRERELEASE_PATCH 0
 ABI_VERSION 29
 OLDEST_SUPPORTED_ABI_VERSION 29
diff --git a/tools/bots/test_matrix.json b/tools/bots/test_matrix.json
index f233f772..6fac31d 100644
--- a/tools/bots/test_matrix.json
+++ b/tools/bots/test_matrix.json
@@ -10,6 +10,7 @@
   "filesets": {
     "analyzer_unit_tests": [
       ".packages",
+      ".dart_tool/package_config.json",
       "pkg/",
       "tests/compiler/dart2js/",
       "third_party/pkg/",
@@ -22,6 +23,7 @@
     ],
     "dart2js": [
       ".packages",
+      ".dart_tool/package_config.json",
       "out/ReleaseIA32/dart-sdk/",
       "out/ReleaseX64/dart-sdk/",
       "out/ReleaseX64/gen/utils/dartdevc/",
@@ -62,6 +64,7 @@
     ],
     "dart2js_nnbd": [
       ".packages",
+      ".dart_tool/package_config.json",
       "out/ReleaseIA32NNBD/dart-sdk/",
       "out/ReleaseX64NNBD/dart-sdk/",
       "out/ReleaseX64NNBD/gen/utils/dartdevc/",
@@ -105,6 +108,7 @@
     ],
     "dart2js_hostasserts": [
       ".packages",
+      ".dart_tool/package_config.json",
       "out/ReleaseIA32/dart",
       "out/ReleaseIA32/dart2js_platform.dill",
       "out/ReleaseIA32/dart2js_platform_strong.dill",
@@ -149,6 +153,7 @@
     ],
     "dart2js_hostasserts_nnbd": [
       ".packages",
+      ".dart_tool/package_config.json",
       "out/ReleaseX64NNBD/dart",
       "out/ReleaseX64NNBD/dart2js_platform.dill",
       "out/ReleaseX64NNBD/dart2js_platform_strong.dill",
@@ -187,6 +192,7 @@
     ],
     "front-end": [
       ".packages",
+      ".dart_tool/package_config.json",
       "out/ReleaseIA32/",
       "out/ReleaseX64/",
       "out/ReleaseX64NNBD/",
@@ -253,6 +259,7 @@
       "pkg/vm/",
       "runtime/",
       "sdk/",
+      ".dart_tool/package_config.json",
       ".packages"
     ],
     "vm-kernel": [
@@ -337,6 +344,7 @@
       "pkg/vm/",
       "runtime/",
       "sdk/",
+      ".dart_tool/package_config.json",
       ".packages",
       ".vpython"
     ],
@@ -423,6 +431,7 @@
       "runtime/",
       "sdk/",
       "sdk_nnbd/",
+      ".dart_tool/package_config.json",
       ".packages",
       ".vpython"
     ]
@@ -1294,7 +1303,7 @@
           ]
         },
         {
-          "name": "vm weak legacy tests with asserts",
+          "name": "vm legacy tests in weak mode with asserts",
           "arguments": [
             "-ndartkp-weak-asserts-${system}-${mode}-${arch}"
           ],
@@ -1302,7 +1311,7 @@
           "shards": 6
         },
         {
-          "name": "vm co19_2 tests",
+          "name": "vm legacy tests(co19_2) in weak mode with asserts",
           "arguments": [
             "-ndartkp-weak-asserts-${system}-${mode}-${arch}",
             "co19_2"
@@ -1311,7 +1320,7 @@
           "shards": 10
         },
         {
-          "name": "vm weak tests with asserts",
+          "name": "vm nnbd tests in weak mode with asserts",
           "arguments": [
             "-ndartkp-weak-asserts-${system}-${mode}-${arch}",
             "ffi",
@@ -1319,6 +1328,16 @@
             "lib/mirrors",
             "standalone/io"
           ]
+        },
+	{
+          "name": "vm nnbd tests in strong mode",
+          "arguments": [
+            "-ndartkp-strong-${system}-${mode}-${arch}",
+            "ffi",
+            "language",
+            "lib/mirrors",
+            "standalone/io"
+          ]
         }
       ]
     },
@@ -1687,7 +1706,7 @@
           ]
         },
         {
-          "name": "vm weak legacy tests with asserts",
+          "name": "vm legacy tests in weak mode with asserts",
           "arguments": [
             "-ndartk-weak-asserts-${system}-${mode}-${arch}"
           ],
@@ -1695,7 +1714,7 @@
           "shards": 6
         },
         {
-          "name": "vm weak legacy tests(co19_2) with asserts",
+          "name": "vm legacy tests(co19_2) in weak mode with asserts",
           "arguments": [
             "-ndartk-weak-asserts-${system}-${mode}-${arch}",
             "co19_2"
@@ -1704,7 +1723,7 @@
           "shards": 6
         },
         {
-          "name": "vm weak tests with asserts",
+          "name": "vm nnbd test in weak mode with asserts",
           "arguments": [
             "-ndartk-weak-asserts-${system}-${mode}-${arch}",
             "ffi",
@@ -1712,6 +1731,16 @@
             "lib/mirrors",
             "standalone/io"
           ]
+        },
+        {
+          "name": "vm nnbd tests in strong mode",
+          "arguments": [
+            "-ndartk-strong-${system}-${mode}-${arch}",
+            "ffi",
+            "language",
+            "lib/mirrors",
+            "standalone/io"
+          ]
         }
       ]
     },
diff --git a/utils/application_snapshot.gni b/utils/application_snapshot.gni
index 92c1921..1074317 100644
--- a/utils/application_snapshot.gni
+++ b/utils/application_snapshot.gni
@@ -93,9 +93,7 @@
                dot_packages,
              ]
     output = "$target_gen_dir/$name.dart.dill"
-    outputs = [
-      output,
-    ]
+    outputs = [ output ]
 
     depfile = "$output.d"
     abs_depfile = rebase_path(depfile)
@@ -133,9 +131,7 @@
 
     inputs = extra_inputs
 
-    outputs = [
-      output,
-    ]
+    outputs = [ output ]
 
     abs_depfile = rebase_path(depfile)
     abs_output = rebase_path(output, root_build_dir)
diff --git a/utils/bazel/BUILD.gn b/utils/bazel/BUILD.gn
index d674776..774f301 100644
--- a/utils/bazel/BUILD.gn
+++ b/utils/bazel/BUILD.gn
@@ -7,7 +7,5 @@
 application_snapshot("kernel_worker") {
   main_dart = "kernel_worker.dart"
   training_args = [ "--help" ]
-  deps = [
-    "../../pkg:pkg_files_stamp",
-  ]
+  deps = [ "../../pkg:pkg_files_stamp" ]
 }
diff --git a/utils/compile_platform.gni b/utils/compile_platform.gni
index 1d30b6f..a2e94b3 100644
--- a/utils/compile_platform.gni
+++ b/utils/compile_platform.gni
@@ -76,8 +76,7 @@
       args +=
           [ rebase_path(invoker.libraries_specification_uri, root_build_dir) ]
     }
-    args +=
-        [ rebase_path("$root_out_dir/$outline", root_build_dir) ]
+    args += [ rebase_path("$root_out_dir/$outline", root_build_dir) ]
     args += rebase_path(outputs, root_build_dir)
   }
 }
diff --git a/utils/compiler/BUILD.gn b/utils/compiler/BUILD.gn
index 9313f35..8ad05ee 100644
--- a/utils/compiler/BUILD.gn
+++ b/utils/compiler/BUILD.gn
@@ -39,9 +39,7 @@
     "../../tools/VERSION",
   ]
 
-  outputs = [
-    "$target_gen_dir/dart2js.dart",
-  ]
+  outputs = [ "$target_gen_dir/dart2js.dart" ]
 
   packages = "../../.packages"
 
diff --git a/utils/create_timestamp.gni b/utils/create_timestamp.gni
index 75ae4cd..835700a 100644
--- a/utils/create_timestamp.gni
+++ b/utils/create_timestamp.gni
@@ -18,9 +18,7 @@
                         [ "absolute" ] + list_args,
                         "list lines")
     inputs = [ "$_dart_root/tools/list_dart_files.py" ] + files
-    outputs = [
-      output,
-    ]
+    outputs = [ output ]
     script = "$_dart_root/tools/create_timestamp_file.py"
     args = [ rebase_path(output) ]
   }
diff --git a/utils/dart2native/BUILD.gn b/utils/dart2native/BUILD.gn
index 47712d1..4557da6 100644
--- a/utils/dart2native/BUILD.gn
+++ b/utils/dart2native/BUILD.gn
@@ -5,15 +5,11 @@
 import("../application_snapshot.gni")
 
 group("dart2native") {
-  deps = [
-    ":generate_dart2native_snapshot",
-  ]
+  deps = [ ":generate_dart2native_snapshot" ]
 }
 
 application_snapshot("generate_dart2native_snapshot") {
   main_dart = "../../pkg/dart2native/bin/dart2native.dart"
-  training_args = [
-    "--help",
-  ]
+  training_args = [ "--help" ]
   name = "dart2native"
 }
diff --git a/utils/dartanalyzer/BUILD.gn b/utils/dartanalyzer/BUILD.gn
index 35b88d7..6065802 100644
--- a/utils/dartanalyzer/BUILD.gn
+++ b/utils/dartanalyzer/BUILD.gn
@@ -43,9 +43,7 @@
   packages = "../../.packages"
   inputs = sdk_lib_files + analyzer_files
   output = "$root_gen_dir/strong.sum"
-  outputs = [
-    output,
-  ]
+  outputs = [ output ]
   if (use_nnbd) {
     args = [
       "build-non-nullable",
diff --git a/utils/dartdevc/BUILD.gn b/utils/dartdevc/BUILD.gn
index ec13940..e8884dd 100644
--- a/utils/dartdevc/BUILD.gn
+++ b/utils/dartdevc/BUILD.gn
@@ -54,9 +54,7 @@
     ":dartdevc_platform",
   ]
 
-  inputs = [
-    sdk_outline_dill,
-  ]
+  inputs = [ sdk_outline_dill ]
 }
 
 # TODO(#38701) Cleanup after merging the forked SDK into mainline.
@@ -98,17 +96,13 @@
   abs_output = rebase_path(out)
 
   prebuilt_dart_action(target_name) {
-    deps = [
-      "../compiler:compile_dart2js_platform",
-    ]
+    deps = [ "../compiler:compile_dart2js_platform" ]
 
     inputs = sdk_lib_files + compiler_files + dev_compiler_files + [
                "$root_out_dir/dart2js_platform.dill",
                "$root_out_dir/dart2js_outline.dill",
              ]
-    outputs = [
-      out,
-    ]
+    outputs = [ out ]
 
     script = "../../pkg/compiler/lib/src/dart2js.dart"
 
@@ -148,9 +142,7 @@
   # Arbitrarily use the version file as a token file to check against to see if
   # the sources have changed.
   # TODO(rnystrom): List the outputs more precisely?
-  outputs = [
-    "$patched_sdk_dir/version",
-  ]
+  outputs = [ "$patched_sdk_dir/version" ]
 
   args = [
     "--libraries",
@@ -370,7 +362,10 @@
 
   # TODO(38701): Cleanup after merging the forked SDK into mainline.
   if (use_nnbd) {
-    args += [ "--enable-experiment=non-nullable", "--force-nnbd-checks" ]
+    args += [
+      "--enable-experiment=non-nullable",
+      "--force-nnbd-checks",
+    ]
   }
 }
 
diff --git a/utils/gen_kernel/BUILD.gn b/utils/gen_kernel/BUILD.gn
index d69281f..a1417bb 100644
--- a/utils/gen_kernel/BUILD.gn
+++ b/utils/gen_kernel/BUILD.gn
@@ -6,17 +6,17 @@
 
 application_snapshot("gen_kernel") {
   main_dart = "../../pkg/vm/bin/gen_kernel.dart"
-  deps = [
-    "../../runtime/vm:vm_platform",
-  ]
+  deps = [ "../../runtime/vm:vm_platform" ]
+
   # NOTE: The output filename must be kept in sync with the output of the
   # vm_platform rule.
-  vm_platform_out = get_label_info("../../runtime/vm:vm_platform", "root_out_dir")
+  vm_platform_out =
+      get_label_info("../../runtime/vm:vm_platform", "root_out_dir")
   vm_platform = "$vm_platform_out/vm_platform_strong.dill"
   training_args = [
-      "--platform",
-      rebase_path(vm_platform),
-      rebase_path("../../pkg/vm/bin/gen_kernel.dart"),
-      "-o -",
+    "--platform",
+    rebase_path(vm_platform),
+    rebase_path("../../pkg/vm/bin/gen_kernel.dart"),
+    "-o -",
   ]
 }
diff --git a/utils/kernel-service/BUILD.gn b/utils/kernel-service/BUILD.gn
index fd63749..062c3ff 100644
--- a/utils/kernel-service/BUILD.gn
+++ b/utils/kernel-service/BUILD.gn
@@ -10,13 +10,9 @@
 
 group("kernel-service") {
   if (create_kernel_service_snapshot) {
-    deps = [
-      ":copy_kernel-service_snapshot",
-    ]
+    deps = [ ":copy_kernel-service_snapshot" ]
   } else {
-    deps = [
-      ":kernel_service_dill",
-    ]
+    deps = [ ":kernel_service_dill" ]
   }
 }
 
@@ -37,15 +33,9 @@
 }
 
 copy("copy_kernel-service_snapshot") {
-  deps = [
-    ":kernel-service_snapshot",
-  ]
-  sources = [
-    "$root_gen_dir/kernel-service.dart.snapshot",
-  ]
-  outputs = [
-    "$root_out_dir/kernel-service.dart.snapshot",
-  ]
+  deps = [ ":kernel-service_snapshot" ]
+  sources = [ "$root_gen_dir/kernel-service.dart.snapshot" ]
+  outputs = [ "$root_out_dir/kernel-service.dart.snapshot" ]
 }
 
 create_timestamp_file("frontend_server_files_stamp") {
@@ -90,9 +80,7 @@
       "$root_out_dir/vm_platform_strong.dill",
     ]
     output = "$root_gen_dir/kernel_service" + invoker.target_name + ".dill"
-    outputs = [
-      output,
-    ]
+    outputs = [ output ]
 
     depfile = "$root_gen_dir/kernel_service" + invoker.target_name + "_dill.d"
     abs_depfile = rebase_path(depfile)