diff --git a/.dart_tool/package_config.json b/.dart_tool/package_config.json
index 284ed91..e95c948 100644
--- a/.dart_tool/package_config.json
+++ b/.dart_tool/package_config.json
@@ -11,7 +11,7 @@
     "constraint, update this by running tools/generate_package_config.dart."
   ],
   "configVersion": 2,
-  "generated": "2021-12-10T17:31:54.553345",
+  "generated": "2021-12-16T12:51:36.232645",
   "generator": "tools/generate_package_config.dart",
   "packages": [
     {
@@ -372,12 +372,6 @@
       "languageVersion": "2.12"
     },
     {
-      "name": "intl",
-      "rootUri": "../third_party/pkg/intl",
-      "packageUri": "lib/",
-      "languageVersion": "2.11"
-    },
-    {
       "name": "js",
       "rootUri": "../pkg/js",
       "packageUri": "lib/",
@@ -817,4 +811,4 @@
       "languageVersion": "2.12"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/DEPS b/DEPS
index 727fe76..1cb6ae4 100644
--- a/DEPS
+++ b/DEPS
@@ -120,7 +120,6 @@
   "http_parser_rev": "202391286ddc13c4c3c284ac5b511f04697250ed",
   "http_rev": "f35d1e1467092f6a5edb2abf7071c4a99e8c737a",
   "icu_rev" : "81d656878ec611cb0b42d52c82e9dae93920d9ba",
-  "intl_tag": "0.17.0-nullsafety",
   "jinja2_rev": "2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rpc_2_rev": "7e00f893440a72de0637970325e4ea44bd1e8c8e",
   "linter_tag": "1.17.1",
@@ -365,8 +364,6 @@
       "@" + Var("http_multi_server_rev"),
   Var("dart_root") + "/third_party/pkg/http_parser":
       Var("dart_git") + "http_parser.git" + "@" + Var("http_parser_rev"),
-  Var("dart_root") + "/third_party/pkg/intl":
-      Var("dart_git") + "intl.git" + "@" + Var("intl_tag"),
   Var("dart_root") + "/third_party/pkg/json_rpc_2":
       Var("dart_git") + "json_rpc_2.git" + "@" + Var("json_rpc_2_rev"),
   Var("dart_root") + "/third_party/pkg/linter":
diff --git a/pkg/analysis_server/benchmark/benchmarks.dart b/pkg/analysis_server/benchmark/benchmarks.dart
index 78a1b36..7037a85 100644
--- a/pkg/analysis_server/benchmark/benchmarks.dart
+++ b/pkg/analysis_server/benchmark/benchmarks.dart
@@ -10,7 +10,6 @@
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer_utilities/package_root.dart';
 import 'package:args/command_runner.dart';
-import 'package:intl/intl.dart';
 import 'package:path/path.dart' as path;
 
 import 'perf/benchmarks_impl.dart';
@@ -88,8 +87,6 @@
 }
 
 class BenchMarkResult {
-  static final NumberFormat nf = NumberFormat.decimalPattern();
-
   /// One of 'bytes', 'micros', or 'compound'.
   final String kindName;
 
@@ -104,7 +101,7 @@
   Map toJson() => {kindName: value};
 
   @override
-  String toString() => '$kindName: ${nf.format(value)}';
+  String toString() => '$kindName: $value';
 }
 
 class CompoundBenchMarkResult extends BenchMarkResult {
diff --git a/pkg/analysis_server/lib/src/domain_completion.dart b/pkg/analysis_server/lib/src/domain_completion.dart
index 692b65f..661049b 100644
--- a/pkg/analysis_server/lib/src/domain_completion.dart
+++ b/pkg/analysis_server/lib/src/domain_completion.dart
@@ -518,8 +518,7 @@
 
         var resolvedUnit = await server.getResolvedUnit(file);
         if (resolvedUnit == null) {
-          server
-              .sendResponse(Response.fileNotAnalyzed(request, 'params.offset'));
+          server.sendResponse(Response.fileNotAnalyzed(request, file));
           return;
         }
 
diff --git a/pkg/analysis_server/lib/src/services/correction/dart/create_constructor_super.dart b/pkg/analysis_server/lib/src/services/correction/dart/create_constructor_super.dart
index 98ac8d5..c571123 100644
--- a/pkg/analysis_server/lib/src/services/correction/dart/create_constructor_super.dart
+++ b/pkg/analysis_server/lib/src/services/correction/dart/create_constructor_super.dart
@@ -76,26 +76,61 @@
   @override
   Future<void> compute(ChangeBuilder builder) async {
     var constructorName = _constructor.name;
-    var requiredParameters = _constructor.parameters
+    var requiredPositionalParameters = _constructor.parameters
         .where((parameter) => parameter.isRequiredPositional);
+    var requiredNamedParameters =
+        _constructor.parameters.where((parameter) => parameter.isRequiredNamed);
     await builder.addDartFileEdit(file, (builder) {
       builder.addInsertion(_targetLocation.offset, (builder) {
-        void writeParameters(bool includeType) {
+        void writeParameters(bool isDefinition) {
+          void writeParameter(ParameterElement parameter) {
+            var parameterName = parameter.displayName;
+            var includeType = isDefinition;
+            var includeRequired = isDefinition && parameter.isRequiredNamed;
+            var includeLabel = !isDefinition && parameter.isRequiredNamed;
+
+            if (parameterName.length > 1 && parameterName.startsWith('_')) {
+              parameterName = parameterName.substring(1);
+            }
+            if (includeRequired) {
+              builder.write('required ');
+            }
+            if (includeType && builder.writeType(parameter.type)) {
+              builder.write(' ');
+            }
+            if (includeLabel) {
+              builder.write('$parameterName: ');
+            }
+            builder.write(parameterName);
+          }
+
           var firstParameter = true;
-          for (var parameter in requiredParameters) {
+          void writeComma() {
             if (firstParameter) {
               firstParameter = false;
             } else {
               builder.write(', ');
             }
-            var parameterName = parameter.displayName;
-            if (parameterName.length > 1 && parameterName.startsWith('_')) {
-              parameterName = parameterName.substring(1);
+          }
+
+          for (var parameter in requiredPositionalParameters) {
+            writeComma();
+            writeParameter(parameter);
+          }
+          if (requiredNamedParameters.isNotEmpty) {
+            var includeBraces = isDefinition;
+            if (includeBraces) {
+              writeComma();
+              firstParameter = true; // Reset since we just included a comma.
+              builder.write('{');
             }
-            if (includeType && builder.writeType(parameter.type)) {
-              builder.write(' ');
+            for (var parameter in requiredNamedParameters) {
+              writeComma();
+              writeParameter(parameter);
             }
-            builder.write(parameterName);
+            if (includeBraces) {
+              builder.write('}');
+            }
           }
         }
 
diff --git a/pkg/analysis_server/lib/src/status/pages.dart b/pkg/analysis_server/lib/src/status/pages.dart
index e0a24ca..894d446 100644
--- a/pkg/analysis_server/lib/src/status/pages.dart
+++ b/pkg/analysis_server/lib/src/status/pages.dart
@@ -5,15 +5,11 @@
 import 'dart:convert';
 import 'dart:io';
 
-import 'package:intl/intl.dart';
-
-final NumberFormat numberFormat = NumberFormat.decimalPattern();
-
 String escape(String? text) => text == null ? '' : htmlEscape.convert(text);
 
-String printInteger(int value) => numberFormat.format(value);
+String printInteger(int value) => '$value';
 
-String printMilliseconds(num value) => '${numberFormat.format(value)} ms';
+String printMilliseconds(int value) => '$value ms';
 
 String printPercentage(num value, [int fractionDigits = 1]) =>
     '${(value * 100).toStringAsFixed(fractionDigits)}%';
diff --git a/pkg/analysis_server/pubspec.yaml b/pkg/analysis_server/pubspec.yaml
index bb60379..39518e8 100644
--- a/pkg/analysis_server/pubspec.yaml
+++ b/pkg/analysis_server/pubspec.yaml
@@ -20,7 +20,6 @@
   dart_style: any
   http: any
   html: any
-  intl: any
   linter: any
   meta:
     path: ../meta
diff --git a/pkg/analysis_server/test/src/services/correction/fix/create_constructor_super_test.dart b/pkg/analysis_server/test/src/services/correction/fix/create_constructor_super_test.dart
index 5a61202..6095520 100644
--- a/pkg/analysis_server/test/src/services/correction/fix/create_constructor_super_test.dart
+++ b/pkg/analysis_server/test/src/services/correction/fix/create_constructor_super_test.dart
@@ -104,7 +104,7 @@
 ''');
   }
 
-  Future<void> test_named() async {
+  Future<void> test_namedConstructor() async {
     await resolveTestCode('''
 class A {
   A.named(p1, int p2);
@@ -129,6 +129,56 @@
 ''');
   }
 
+  Future<void> test_namedOptionalParams() async {
+    await resolveTestCode('''
+class A {
+  A(p1, int p2, List<String> p3, {int? p4});
+}
+class B extends A {
+  int existingField = 0;
+
+  void existingMethod() {}
+}
+''');
+    await assertHasFix('''
+class A {
+  A(p1, int p2, List<String> p3, {int? p4});
+}
+class B extends A {
+  int existingField = 0;
+
+  B(p1, int p2, List<String> p3) : super(p1, p2, p3);
+
+  void existingMethod() {}
+}
+''');
+  }
+
+  Future<void> test_namedRequiredParams() async {
+    await resolveTestCode('''
+class A {
+  A(p1, int p2, List<String> p3, {required int p4, required int p5});
+}
+class B extends A {
+  int existingField = 0;
+
+  void existingMethod() {}
+}
+''');
+    await assertHasFix('''
+class A {
+  A(p1, int p2, List<String> p3, {required int p4, required int p5});
+}
+class B extends A {
+  int existingField = 0;
+
+  B(p1, int p2, List<String> p3, {required int p4, required int p5}) : super(p1, p2, p3, p4: p4, p5: p5);
+
+  void existingMethod() {}
+}
+''');
+  }
+
   Future<void> test_optional() async {
     await resolveTestCode('''
 class A {
diff --git a/pkg/dartdev/lib/src/commands/fix.dart b/pkg/dartdev/lib/src/commands/fix.dart
index d6c8b5a..f8659f6 100644
--- a/pkg/dartdev/lib/src/commands/fix.dart
+++ b/pkg/dartdev/lib/src/commands/fix.dart
@@ -6,7 +6,6 @@
 import 'dart:io' as io;
 
 import 'package:analysis_server_client/protocol.dart' hide AnalysisError;
-import 'package:intl/intl.dart';
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as path;
 
@@ -18,8 +17,6 @@
 class FixCommand extends DartdevCommand {
   static const String cmdName = 'fix';
 
-  static final NumberFormat _numberFormat = NumberFormat.decimalPattern();
-
   static const String cmdDescription =
       '''Apply automated fixes to Dart source code.
 
@@ -344,7 +341,7 @@
     }
   }
 
-  static String _format(int value) => _numberFormat.format(value);
+  static String _format(int value) => '$value';
 }
 
 /// The result of running tests in a given directory.
diff --git a/pkg/dartdev/pubspec.yaml b/pkg/dartdev/pubspec.yaml
index aa4f922..9d78178 100644
--- a/pkg/dartdev/pubspec.yaml
+++ b/pkg/dartdev/pubspec.yaml
@@ -23,7 +23,6 @@
   devtools_server: any
   front_end:
     path: ../front_end
-  intl: any
   meta:
     path: ../meta
   nnbd_migration:
diff --git a/pkg/front_end/lib/src/base/processed_options.dart b/pkg/front_end/lib/src/base/processed_options.dart
index b1377c6..521d5ab 100644
--- a/pkg/front_end/lib/src/base/processed_options.dart
+++ b/pkg/front_end/lib/src/base/processed_options.dart
@@ -557,6 +557,15 @@
       return _packages = await createPackagesFromFile(_raw.packagesFileUri!);
     }
 
+    if (inputs.isEmpty) {
+      return _packages = PackageConfig.empty;
+    }
+
+    // When compiling the SDK the input files are normally `dart:` URIs.
+    if (inputs.every((uri) => uri.scheme == 'dart')) {
+      return _packages = PackageConfig.empty;
+    }
+
     if (inputs.length > 1) {
       // TODO(sigmund): consider not reporting an error if we would infer
       // the same .packages file from all of the inputs.
@@ -564,15 +573,9 @@
           messageCantInferPackagesFromManyInputs, Severity.error);
       return _packages = PackageConfig.empty;
     }
-    if (inputs.isEmpty) {
-      return _packages = PackageConfig.empty;
-    }
 
     Uri input = inputs.first;
 
-    // When compiling the SDK the input files are normally `dart:` URIs.
-    if (input.scheme == 'dart') return _packages = PackageConfig.empty;
-
     if (input.scheme == 'packages') {
       report(
           messageCantInferPackagesFromPackageUri.withLocation(
@@ -581,7 +584,7 @@
       return _packages = PackageConfig.empty;
     }
 
-    return _packages = await _findPackages(inputs.first);
+    return _packages = await _findPackages(input);
   }
 
   Future<Uint8List?> _readFile(Uri uri, bool reportError) async {
diff --git a/pkg/front_end/tool/_fasta/command_line.dart b/pkg/front_end/tool/_fasta/command_line.dart
index 0c8312e..58d7517 100644
--- a/pkg/front_end/tool/_fasta/command_line.dart
+++ b/pkg/front_end/tool/_fasta/command_line.dart
@@ -277,7 +277,7 @@
           ..sdkSummary = Options.platform.read(parsedOptions)
           ..librariesSpecificationUri = resolveInputUri(arguments[1])
           ..setExitCodeOnProblem = true,
-        inputs: <Uri>[Uri.parse(arguments[0])],
+        inputs: arguments[0].split(',').map(Uri.parse).toList(),
         output: resolveInputUri(arguments[3]));
   } else if (arguments.isEmpty) {
     return throw new CommandLineProblem.deprecated("No Dart file specified.");
diff --git a/pkg/front_end/tool/_fasta/compile_platform_legacy_test.dart b/pkg/front_end/tool/_fasta/compile_platform_legacy_test.dart
index 073dd5f..b7b6fa6 100644
--- a/pkg/front_end/tool/_fasta/compile_platform_legacy_test.dart
+++ b/pkg/front_end/tool/_fasta/compile_platform_legacy_test.dart
@@ -36,6 +36,30 @@
       Expect.isTrue(await new File.fromUri(outlineDill).exists());
     });
   });
+
+  asyncTest(() async {
+    await withTemporaryDirectory("compile_platform_test_", (Uri tmp) async {
+      Uri platformDill = tmp.resolve("dart2js_platform.dill");
+      Uri outlineDill = tmp.resolve("dart2js_outline.dill");
+      ProcessResult result = await Process.run(dartVm.toFilePath(), <String>[
+        compilePlatform.toFilePath(),
+        "--target=dart2js",
+        "--no-deps",
+        "-v",
+        "dart:core,dart:js_util",
+        librariesJson.toFilePath(),
+        outlineDill.toFilePath(),
+        platformDill.toFilePath(),
+        outlineDill.toFilePath(),
+      ]);
+      stdout.write(result.stdout);
+      stderr.write(result.stderr);
+      Expect.equals(
+          0, result.exitCode, "Non-zero exitcode from compile_platform.dart");
+      Expect.isTrue(await new File.fromUri(platformDill).exists());
+      Expect.isTrue(await new File.fromUri(outlineDill).exists());
+    });
+  });
 }
 
 Future<void> withTemporaryDirectory(
diff --git a/pkg/front_end/tool/_fasta/compile_platform_test.dart b/pkg/front_end/tool/_fasta/compile_platform_test.dart
index 073dd5f..b7b6fa6 100644
--- a/pkg/front_end/tool/_fasta/compile_platform_test.dart
+++ b/pkg/front_end/tool/_fasta/compile_platform_test.dart
@@ -36,6 +36,30 @@
       Expect.isTrue(await new File.fromUri(outlineDill).exists());
     });
   });
+
+  asyncTest(() async {
+    await withTemporaryDirectory("compile_platform_test_", (Uri tmp) async {
+      Uri platformDill = tmp.resolve("dart2js_platform.dill");
+      Uri outlineDill = tmp.resolve("dart2js_outline.dill");
+      ProcessResult result = await Process.run(dartVm.toFilePath(), <String>[
+        compilePlatform.toFilePath(),
+        "--target=dart2js",
+        "--no-deps",
+        "-v",
+        "dart:core,dart:js_util",
+        librariesJson.toFilePath(),
+        outlineDill.toFilePath(),
+        platformDill.toFilePath(),
+        outlineDill.toFilePath(),
+      ]);
+      stdout.write(result.stdout);
+      stderr.write(result.stderr);
+      Expect.equals(
+          0, result.exitCode, "Non-zero exitcode from compile_platform.dart");
+      Expect.isTrue(await new File.fromUri(platformDill).exists());
+      Expect.isTrue(await new File.fromUri(outlineDill).exists());
+    });
+  });
 }
 
 Future<void> withTemporaryDirectory(
diff --git a/sdk/lib/async/broadcast_stream_controller.dart b/sdk/lib/async/broadcast_stream_controller.dart
index c2db270..bed1f7d 100644
--- a/sdk/lib/async/broadcast_stream_controller.dart
+++ b/sdk/lib/async/broadcast_stream_controller.dart
@@ -254,7 +254,6 @@
     } else {
       stackTrace ??= AsyncError.defaultStackTrace(error);
     }
-    if (stackTrace == null) throw "unreachable"; // TODO(40088)
     _sendError(error, stackTrace);
   }
 
diff --git a/sdk/lib/async/future.dart b/sdk/lib/async/future.dart
index 2283ba7..ea6c234 100644
--- a/sdk/lib/async/future.dart
+++ b/sdk/lib/async/future.dart
@@ -1097,7 +1097,6 @@
   } else {
     stackTrace ??= AsyncError.defaultStackTrace(error);
   }
-  if (stackTrace == null) throw "unreachable"; // TODO(40088).
   result._completeError(error, stackTrace);
 }
 
diff --git a/sdk/lib/async/future_impl.dart b/sdk/lib/async/future_impl.dart
index 52664b3..c3dc65b 100644
--- a/sdk/lib/async/future_impl.dart
+++ b/sdk/lib/async/future_impl.dart
@@ -29,7 +29,6 @@
     } else {
       stackTrace ??= AsyncError.defaultStackTrace(error);
     }
-    if (stackTrace == null) throw "unreachable"; // TODO(40088)
     _completeError(error, stackTrace);
   }
 
diff --git a/sdk/lib/async/stream_controller.dart b/sdk/lib/async/stream_controller.dart
index 7121af8..6a21c59 100644
--- a/sdk/lib/async/stream_controller.dart
+++ b/sdk/lib/async/stream_controller.dart
@@ -565,7 +565,6 @@
     } else {
       stackTrace ??= AsyncError.defaultStackTrace(error);
     }
-    if (stackTrace == null) throw "unreachable"; // TODO(40088)
     _addError(error, stackTrace);
   }
 
diff --git a/tools/VERSION b/tools/VERSION
index 53d046d..5031272 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@
 MAJOR 2
 MINOR 16
 PATCH 0
-PRERELEASE 125
+PRERELEASE 126
 PRERELEASE_PATCH 0
\ No newline at end of file