[cfe] Use target constructor uri as file offset for typedef tear off lowering

Previously the tear off lowering procedure used the typedef uri and
offset, but the parameters and body used the target constructor offsets.
This meant that file offset were looked up in the wrong file.

Change-Id: Ie754d09a1475d1b67231676f7d4f24bff7056ff4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/212004
Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
diff --git a/pkg/front_end/lib/src/fasta/source/source_type_alias_builder.dart b/pkg/front_end/lib/src/fasta/source/source_type_alias_builder.dart
index a64606e..37971a9 100644
--- a/pkg/front_end/lib/src/fasta/source/source_type_alias_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_type_alias_builder.dart
@@ -316,8 +316,8 @@
           Name targetName =
               new Name(constructorName, declaration.library.library);
           Procedure tearOff = tearOffs![targetName] =
-              createTypedefTearOffProcedure(
-                  name, constructorName, library, fileUri, charOffset);
+              createTypedefTearOffProcedure(name, constructorName, library,
+                  target.fileUri, target.fileOffset);
           _tearOffDependencies![tearOff] = target;
 
           buildTypedefTearOffProcedure(tearOff, target, declaration.cls,
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.expect
index 91acfd5..1ecd540 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.expect
@@ -90,19 +90,19 @@
   core::String typeName = (#C7).{core::Type::toString}(){() → core::String};
   core::String functionTypeName = (local<core::int>).{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
 }
-static method _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length = #C9]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length = #C9]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
   return core::List::•<core::List<self::_#ListList#new#tearOff::T%>>(length);
-static method _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable = #C10}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable = #C10}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
   return core::List::filled<core::List<self::_#ListList#filled#tearOff::T%>>(length, fill, growable: growable);
-static method _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable = #C10}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable = #C10}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
   return core::List::empty<core::List<self::_#ListList#empty#tearOff::T%>>(growable: growable);
-static method _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
   return core::List::from<core::List<self::_#ListList#from#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
   return core::List::of<core::List<self::_#ListList#of#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
   return core::List::generate<core::List<self::_#ListList#generate#tearOff::T%>>(length, generator, growable: growable);
-static method _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
   return core::List::unmodifiable<core::List<self::_#ListList#unmodifiable#tearOff::T%>>(elements);
 
 constants  {
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.transformed.expect
index 5ba5c40..4176e23 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.transformed.expect
@@ -98,19 +98,19 @@
   core::String typeName = (#C7).{core::Type::toString}(){() → core::String};
   core::String functionTypeName = (local<core::int>).{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
 }
-static method _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length = #C9]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length = #C9]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
   return core::_List::•<core::List<self::_#ListList#new#tearOff::T%>>(length);
-static method _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable = #C10}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable = #C10}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
   return core::List::filled<core::List<self::_#ListList#filled#tearOff::T%>>(length, fill, growable: growable);
-static method _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable = #C10}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable = #C10}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
   return core::List::empty<core::List<self::_#ListList#empty#tearOff::T%>>(growable: growable);
-static method _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
   return core::List::from<core::List<self::_#ListList#from#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
   return core::List::of<core::List<self::_#ListList#of#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
   return core::List::generate<core::List<self::_#ListList#generate#tearOff::T%>>(length, generator, growable: growable);
-static method _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
   return core::List::unmodifiable<core::List<self::_#ListList#unmodifiable#tearOff::T%>>(elements);
 
 constants  {
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.expect
index d11b021..10969f4 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.expect
@@ -90,19 +90,19 @@
   core::String typeName = (#C7).{core::Type::toString}(){() → core::String};
   core::String functionTypeName = (local<core::int>).{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
 }
-static method _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length = #C9]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length = #C9]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
   return core::List::•<core::List<self::_#ListList#new#tearOff::T%>>(length);
-static method _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable = #C10}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable = #C10}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
   return core::List::filled<core::List<self::_#ListList#filled#tearOff::T%>>(length, fill, growable: growable);
-static method _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable = #C10}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable = #C10}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
   return core::List::empty<core::List<self::_#ListList#empty#tearOff::T%>>(growable: growable);
-static method _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
   return core::List::from<core::List<self::_#ListList#from#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
   return core::List::of<core::List<self::_#ListList#of#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
   return core::List::generate<core::List<self::_#ListList#generate#tearOff::T%>>(length, generator, growable: growable);
-static method _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
   return core::List::unmodifiable<core::List<self::_#ListList#unmodifiable#tearOff::T%>>(elements);
 
 constants  {
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.outline.expect
index 989a2cb..0db844e 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.outline.expect
@@ -57,17 +57,17 @@
   return () → void => self::Ext|emethod(#this);
 static method main() → void
   ;
-static method _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
   return core::List::•<core::List<self::_#ListList#new#tearOff::T%>>(length);
-static method _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
   return core::List::filled<core::List<self::_#ListList#filled#tearOff::T%>>(length, fill, growable: growable);
-static method _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
   return core::List::empty<core::List<self::_#ListList#empty#tearOff::T%>>(growable: growable);
-static method _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
   return core::List::from<core::List<self::_#ListList#from#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
   return core::List::of<core::List<self::_#ListList#of#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
   return core::List::generate<core::List<self::_#ListList#generate#tearOff::T%>>(length, generator, growable: growable);
-static method _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
   return core::List::unmodifiable<core::List<self::_#ListList#unmodifiable#tearOff::T%>>(elements);
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.transformed.expect
index c8e2bba..f3202b5 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.transformed.expect
@@ -98,19 +98,19 @@
   core::String typeName = (#C7).{core::Type::toString}(){() → core::String};
   core::String functionTypeName = (local<core::int>).{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
 }
-static method _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length = #C9]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#new#tearOff<T extends core::Object? = dynamic>([core::int? length = #C9]) → core::List<core::List<self::_#ListList#new#tearOff::T%>>
   return core::_List::•<core::List<self::_#ListList#new#tearOff::T%>>(length);
-static method _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable = #C10}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#filled#tearOff<T extends core::Object? = dynamic>(core::int length, core::List<self::_#ListList#filled#tearOff::T%> fill, {core::bool growable = #C10}) → core::List<core::List<self::_#ListList#filled#tearOff::T%>>
   return core::List::filled<core::List<self::_#ListList#filled#tearOff::T%>>(length, fill, growable: growable);
-static method _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable = #C10}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#empty#tearOff<T extends core::Object? = dynamic>({core::bool growable = #C10}) → core::List<core::List<self::_#ListList#empty#tearOff::T%>>
   return core::List::empty<core::List<self::_#ListList#empty#tearOff::T%>>(growable: growable);
-static method _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#from#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#from#tearOff::T%>>
   return core::List::from<core::List<self::_#ListList#from#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#of#tearOff<T extends core::Object? = dynamic>(core::Iterable<core::List<self::_#ListList#of#tearOff::T%>> elements, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#of#tearOff::T%>>
   return core::List::of<core::List<self::_#ListList#of#tearOff::T%>>(elements, growable: growable);
-static method _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#generate#tearOff<T extends core::Object? = dynamic>(core::int length, (core::int) → core::List<self::_#ListList#generate#tearOff::T%> generator, {core::bool growable = #C11}) → core::List<core::List<self::_#ListList#generate#tearOff::T%>>
   return core::List::generate<core::List<self::_#ListList#generate#tearOff::T%>>(length, generator, growable: growable);
-static method _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/array_patch.dart */ _#ListList#unmodifiable#tearOff<T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<core::List<self::_#ListList#unmodifiable#tearOff::T%>>
   return core::List::unmodifiable<core::List<self::_#ListList#unmodifiable#tearOff::T%>>(elements);
 
 constants  {
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart
new file mode 100644
index 0000000..6dd9ff1
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart
@@ -0,0 +1,80 @@
+// Copyright (c) 2021, 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 'typedef_from_lib.dart';
+
+part 'typedef_from_part.dart';
+
+main() {
+  var aNew = A.new;
+  var aNamed = A.named;
+  var aFact = A.fact;
+  var aRedirect = A.redirect;
+
+  aNew('', '');
+  aNew(0, '');
+  aNamed('');
+  aNamed(0, '');
+  aNamed('', '', 87);
+  aFact(0);
+  aFact('', b: '');
+  aFact(0, c: 87);
+  aFact('', c: 87, b: '');
+  aRedirect('');
+  aRedirect(0);
+
+  var aNewInst = aNew<bool>;
+  var aNamedInst = aNamed<bool>;
+  var aFactInst = aFact<bool>;
+  var aRedirectInst = aRedirect<bool>;
+
+  aNewInst(true, '');
+  aNamedInst(false);
+  aNamedInst(true, '');
+  aNamedInst(false, '', 87);
+  aFactInst(true);
+  aFactInst(false, b: '');
+  aFactInst(true, c: 87);
+  aFactInst(false, c: 87, b: '');
+  aRedirectInst(true);
+  
+  var bNew = B.new;
+  var bNamed = B.named;
+  var bFact = B.fact;
+  var bRedirect = B.redirect;
+
+  bNew('', 0);
+  bNew(0, 0);
+  bNamed('');
+  bNamed(0, 0);
+  bNamed('', 0, 87);
+  bFact(0);
+  bFact('', b: 0);
+  bFact(0, c: 87);
+  bFact('', c: 87, b: 0);
+  bRedirect('');
+  bRedirect(0);
+
+  var bNewInst = bNew<bool>;
+  var bNamedInst = bNamed<bool>;
+  var bFactInst = bFact<bool>;
+  var bRedirectInst = bRedirect<bool>;
+
+  bNewInst(true, 0);
+  bNamedInst(false);
+  bNamedInst(true, 0);
+  bNamedInst(false, 0, 87);
+  bFactInst(true);
+  bFactInst(false, b: 0);
+  bFactInst(true, c: 87);
+  bFactInst(false, c: 87, b: 0);
+  bRedirectInst(true);
+}
+
+class Class<S, T> {
+  Class(S a, T b);
+  Class.named(S a, [T? b, int c = 42]);
+  factory Class.fact(S a, {T? b, int c: 42}) => Class.named(a, b, c);
+  factory Class.redirect(S a) = Class.named;
+}
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.strong.expect
new file mode 100644
index 0000000..3f74e4e
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.strong.expect
@@ -0,0 +1,125 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///typedef_from_lib.dart";
+
+part typedef_from_part.dart;
+typedef B<S extends core::Object? = dynamic> = self::Class<S%, core::int>;
+class Class<S extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object {
+  static final field dynamic _redirecting# = <dynamic>[self::Class::redirect]/*isLegacy*/;
+  constructor •(self::Class::S% a, self::Class::T% b) → self::Class<self::Class::S%, self::Class::T%>
+    : super core::Object::•()
+    ;
+  constructor named(self::Class::S% a, [self::Class::T? b = #C1, core::int c = #C2]) → self::Class<self::Class::S%, self::Class::T%>
+    : super core::Object::•()
+    ;
+  static method _#new#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#new#tearOff::S% a, self::Class::_#new#tearOff::T% b) → self::Class<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>
+    return new self::Class::•<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>(a, b);
+  static method _#named#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#named#tearOff::S% a, [self::Class::_#named#tearOff::T? b = #C1, core::int c = #C2]) → self::Class<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>
+    return new self::Class::named<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>(a, b, c);
+  static factory fact<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::fact::S% a, {self::Class::fact::T? b = #C1, core::int c = #C2}) → self::Class<self::Class::fact::S%, self::Class::fact::T%>
+    return new self::Class::named<self::Class::fact::S%, self::Class::fact::T%>(a, b, c);
+  static method _#fact#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#fact#tearOff::S% a, {self::Class::_#fact#tearOff::T? b = #C1, core::int c = #C2}) → self::Class<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>
+    return self::Class::fact<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>(a, b: b, c: c);
+  static factory redirect<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::redirect::S% a) → self::Class<self::Class::redirect::S%, self::Class::redirect::T%>
+    return new self::Class::named<self::Class::redirect::S%, self::Class::redirect::T%>(a);
+  static method _#redirect#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#redirect#tearOff::S% a) → self::Class<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>
+    return new self::Class::named<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>(a);
+}
+static method main() → dynamic {
+  <T extends core::Object? = dynamic>(T%, core::String) → self::Class<T%, core::String> aNew = #C3;
+  <T extends core::Object? = dynamic>(T%, [core::String?, core::int]) → self::Class<T%, core::String> aNamed = #C4;
+  <T extends core::Object? = dynamic>(T%, {b: core::String?, c: core::int}) → self::Class<T%, core::String> aFact = #C5;
+  <T extends core::Object? = dynamic>(T%) → self::Class<T%, core::String> aRedirect = #C6;
+  aNew<core::String>("", ""){(core::String, core::String) → self::Class<core::String, core::String>};
+  aNew<core::int>(0, ""){(core::int, core::String) → self::Class<core::int, core::String>};
+  aNamed<core::String>(""){(core::String, [core::String?, core::int]) → self::Class<core::String, core::String>};
+  aNamed<core::int>(0, ""){(core::int, [core::String?, core::int]) → self::Class<core::int, core::String>};
+  aNamed<core::String>("", "", 87){(core::String, [core::String?, core::int]) → self::Class<core::String, core::String>};
+  aFact<core::int>(0){(core::int, {b: core::String?, c: core::int}) → self::Class<core::int, core::String>};
+  aFact<core::String>("", b: ""){(core::String, {b: core::String?, c: core::int}) → self::Class<core::String, core::String>};
+  aFact<core::int>(0, c: 87){(core::int, {b: core::String?, c: core::int}) → self::Class<core::int, core::String>};
+  aFact<core::String>("", c: 87, b: ""){(core::String, {b: core::String?, c: core::int}) → self::Class<core::String, core::String>};
+  aRedirect<core::String>(""){(core::String) → self::Class<core::String, core::String>};
+  aRedirect<core::int>(0){(core::int) → self::Class<core::int, core::String>};
+  (core::bool, core::String) → self::Class<core::bool, core::String> aNewInst = aNew<core::bool>;
+  (core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String> aNamedInst = aNamed<core::bool>;
+  (core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String> aFactInst = aFact<core::bool>;
+  (core::bool) → self::Class<core::bool, core::String> aRedirectInst = aRedirect<core::bool>;
+  aNewInst(true, ""){(core::bool, core::String) → self::Class<core::bool, core::String>};
+  aNamedInst(false){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aNamedInst(true, ""){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aNamedInst(false, "", 87){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aFactInst(true){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(false, b: ""){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(true, c: 87){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(false, c: 87, b: ""){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aRedirectInst(true){(core::bool) → self::Class<core::bool, core::String>};
+  <S extends core::Object? = dynamic>(S%, core::int) → self::Class<S%, core::int> bNew = #C7;
+  <S extends core::Object? = dynamic>(S%, [core::int?, core::int]) → self::Class<S%, core::int> bNamed = #C8;
+  <S extends core::Object? = dynamic>(S%, {b: core::int?, c: core::int}) → self::Class<S%, core::int> bFact = #C9;
+  <S extends core::Object? = dynamic>(S%) → self::Class<S%, core::int> bRedirect = #C10;
+  bNew<core::String>("", 0){(core::String, core::int) → self::Class<core::String, core::int>};
+  bNew<core::int>(0, 0){(core::int, core::int) → self::Class<core::int, core::int>};
+  bNamed<core::String>(""){(core::String, [core::int?, core::int]) → self::Class<core::String, core::int>};
+  bNamed<core::int>(0, 0){(core::int, [core::int?, core::int]) → self::Class<core::int, core::int>};
+  bNamed<core::String>("", 0, 87){(core::String, [core::int?, core::int]) → self::Class<core::String, core::int>};
+  bFact<core::int>(0){(core::int, {b: core::int?, c: core::int}) → self::Class<core::int, core::int>};
+  bFact<core::String>("", b: 0){(core::String, {b: core::int?, c: core::int}) → self::Class<core::String, core::int>};
+  bFact<core::int>(0, c: 87){(core::int, {b: core::int?, c: core::int}) → self::Class<core::int, core::int>};
+  bFact<core::String>("", c: 87, b: 0){(core::String, {b: core::int?, c: core::int}) → self::Class<core::String, core::int>};
+  bRedirect<core::String>(""){(core::String) → self::Class<core::String, core::int>};
+  bRedirect<core::int>(0){(core::int) → self::Class<core::int, core::int>};
+  (core::bool, core::int) → self::Class<core::bool, core::int> bNewInst = bNew<core::bool>;
+  (core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int> bNamedInst = bNamed<core::bool>;
+  (core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int> bFactInst = bFact<core::bool>;
+  (core::bool) → self::Class<core::bool, core::int> bRedirectInst = bRedirect<core::bool>;
+  bNewInst(true, 0){(core::bool, core::int) → self::Class<core::bool, core::int>};
+  bNamedInst(false){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bNamedInst(true, 0){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bNamedInst(false, 0, 87){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bFactInst(true){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(false, b: 0){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(true, c: 87){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(false, c: 87, b: 0){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bRedirectInst(true){(core::bool) → self::Class<core::bool, core::int>};
+}
+static method _#B#new#tearOff<S extends core::Object? = dynamic>(self::_#B#new#tearOff::S% a, core::int b) → self::Class<self::_#B#new#tearOff::S%, core::int>
+  return new self::Class::•<self::_#B#new#tearOff::S%, core::int>(a, b);
+static method _#B#named#tearOff<S extends core::Object? = dynamic>(self::_#B#named#tearOff::S% a, [core::int? b = #C1, core::int c = #C2]) → self::Class<self::_#B#named#tearOff::S%, core::int>
+  return new self::Class::named<self::_#B#named#tearOff::S%, core::int>(a, b, c);
+static method _#B#fact#tearOff<S extends core::Object? = dynamic>(self::_#B#fact#tearOff::S% a, {core::int? b = #C1, core::int c = #C2}) → self::Class<self::_#B#fact#tearOff::S%, core::int>
+  return self::Class::fact<self::_#B#fact#tearOff::S%, core::int>(a, b: b, c: c);
+static method _#B#redirect#tearOff<S extends core::Object? = dynamic>(self::_#B#redirect#tearOff::S% a) → self::Class<self::_#B#redirect#tearOff::S%, core::int>
+  return self::Class::_#redirect#tearOff<self::_#B#redirect#tearOff::S%, core::int>(a);
+
+library /*isNonNullableByDefault*/;
+import self as self2;
+import "dart:core" as core;
+import "typedef_from.dart" as self;
+
+import "org-dartlang-testcase:///typedef_from.dart";
+
+typedef A<T extends core::Object? = dynamic> = self::Class<T%, core::String>;
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#new#tearOff<T extends core::Object? = dynamic>(self2::_#A#new#tearOff::T% a, core::String b) → self::Class<self2::_#A#new#tearOff::T%, core::String>
+  return new self::Class::•<self2::_#A#new#tearOff::T%, core::String>(a, b);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#named#tearOff<T extends core::Object? = dynamic>(self2::_#A#named#tearOff::T% a, [core::String? b = #C1, core::int c = #C2]) → self::Class<self2::_#A#named#tearOff::T%, core::String>
+  return new self::Class::named<self2::_#A#named#tearOff::T%, core::String>(a, b, c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#fact#tearOff<T extends core::Object? = dynamic>(self2::_#A#fact#tearOff::T% a, {core::String? b = #C1, core::int c = #C2}) → self::Class<self2::_#A#fact#tearOff::T%, core::String>
+  return self::Class::fact<self2::_#A#fact#tearOff::T%, core::String>(a, b: b, c: c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#redirect#tearOff<T extends core::Object? = dynamic>(self2::_#A#redirect#tearOff::T% a) → self::Class<self2::_#A#redirect#tearOff::T%, core::String>
+  return self::Class::_#redirect#tearOff<self2::_#A#redirect#tearOff::T%, core::String>(a);
+
+constants  {
+  #C1 = null
+  #C2 = 42
+  #C3 = static-tearoff self2::_#A#new#tearOff
+  #C4 = static-tearoff self2::_#A#named#tearOff
+  #C5 = static-tearoff self2::_#A#fact#tearOff
+  #C6 = static-tearoff self2::_#A#redirect#tearOff
+  #C7 = static-tearoff self::_#B#new#tearOff
+  #C8 = static-tearoff self::_#B#named#tearOff
+  #C9 = static-tearoff self::_#B#fact#tearOff
+  #C10 = static-tearoff self::_#B#redirect#tearOff
+}
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.strong.transformed.expect
new file mode 100644
index 0000000..3f74e4e
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.strong.transformed.expect
@@ -0,0 +1,125 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///typedef_from_lib.dart";
+
+part typedef_from_part.dart;
+typedef B<S extends core::Object? = dynamic> = self::Class<S%, core::int>;
+class Class<S extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object {
+  static final field dynamic _redirecting# = <dynamic>[self::Class::redirect]/*isLegacy*/;
+  constructor •(self::Class::S% a, self::Class::T% b) → self::Class<self::Class::S%, self::Class::T%>
+    : super core::Object::•()
+    ;
+  constructor named(self::Class::S% a, [self::Class::T? b = #C1, core::int c = #C2]) → self::Class<self::Class::S%, self::Class::T%>
+    : super core::Object::•()
+    ;
+  static method _#new#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#new#tearOff::S% a, self::Class::_#new#tearOff::T% b) → self::Class<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>
+    return new self::Class::•<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>(a, b);
+  static method _#named#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#named#tearOff::S% a, [self::Class::_#named#tearOff::T? b = #C1, core::int c = #C2]) → self::Class<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>
+    return new self::Class::named<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>(a, b, c);
+  static factory fact<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::fact::S% a, {self::Class::fact::T? b = #C1, core::int c = #C2}) → self::Class<self::Class::fact::S%, self::Class::fact::T%>
+    return new self::Class::named<self::Class::fact::S%, self::Class::fact::T%>(a, b, c);
+  static method _#fact#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#fact#tearOff::S% a, {self::Class::_#fact#tearOff::T? b = #C1, core::int c = #C2}) → self::Class<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>
+    return self::Class::fact<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>(a, b: b, c: c);
+  static factory redirect<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::redirect::S% a) → self::Class<self::Class::redirect::S%, self::Class::redirect::T%>
+    return new self::Class::named<self::Class::redirect::S%, self::Class::redirect::T%>(a);
+  static method _#redirect#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#redirect#tearOff::S% a) → self::Class<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>
+    return new self::Class::named<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>(a);
+}
+static method main() → dynamic {
+  <T extends core::Object? = dynamic>(T%, core::String) → self::Class<T%, core::String> aNew = #C3;
+  <T extends core::Object? = dynamic>(T%, [core::String?, core::int]) → self::Class<T%, core::String> aNamed = #C4;
+  <T extends core::Object? = dynamic>(T%, {b: core::String?, c: core::int}) → self::Class<T%, core::String> aFact = #C5;
+  <T extends core::Object? = dynamic>(T%) → self::Class<T%, core::String> aRedirect = #C6;
+  aNew<core::String>("", ""){(core::String, core::String) → self::Class<core::String, core::String>};
+  aNew<core::int>(0, ""){(core::int, core::String) → self::Class<core::int, core::String>};
+  aNamed<core::String>(""){(core::String, [core::String?, core::int]) → self::Class<core::String, core::String>};
+  aNamed<core::int>(0, ""){(core::int, [core::String?, core::int]) → self::Class<core::int, core::String>};
+  aNamed<core::String>("", "", 87){(core::String, [core::String?, core::int]) → self::Class<core::String, core::String>};
+  aFact<core::int>(0){(core::int, {b: core::String?, c: core::int}) → self::Class<core::int, core::String>};
+  aFact<core::String>("", b: ""){(core::String, {b: core::String?, c: core::int}) → self::Class<core::String, core::String>};
+  aFact<core::int>(0, c: 87){(core::int, {b: core::String?, c: core::int}) → self::Class<core::int, core::String>};
+  aFact<core::String>("", c: 87, b: ""){(core::String, {b: core::String?, c: core::int}) → self::Class<core::String, core::String>};
+  aRedirect<core::String>(""){(core::String) → self::Class<core::String, core::String>};
+  aRedirect<core::int>(0){(core::int) → self::Class<core::int, core::String>};
+  (core::bool, core::String) → self::Class<core::bool, core::String> aNewInst = aNew<core::bool>;
+  (core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String> aNamedInst = aNamed<core::bool>;
+  (core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String> aFactInst = aFact<core::bool>;
+  (core::bool) → self::Class<core::bool, core::String> aRedirectInst = aRedirect<core::bool>;
+  aNewInst(true, ""){(core::bool, core::String) → self::Class<core::bool, core::String>};
+  aNamedInst(false){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aNamedInst(true, ""){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aNamedInst(false, "", 87){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aFactInst(true){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(false, b: ""){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(true, c: 87){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(false, c: 87, b: ""){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aRedirectInst(true){(core::bool) → self::Class<core::bool, core::String>};
+  <S extends core::Object? = dynamic>(S%, core::int) → self::Class<S%, core::int> bNew = #C7;
+  <S extends core::Object? = dynamic>(S%, [core::int?, core::int]) → self::Class<S%, core::int> bNamed = #C8;
+  <S extends core::Object? = dynamic>(S%, {b: core::int?, c: core::int}) → self::Class<S%, core::int> bFact = #C9;
+  <S extends core::Object? = dynamic>(S%) → self::Class<S%, core::int> bRedirect = #C10;
+  bNew<core::String>("", 0){(core::String, core::int) → self::Class<core::String, core::int>};
+  bNew<core::int>(0, 0){(core::int, core::int) → self::Class<core::int, core::int>};
+  bNamed<core::String>(""){(core::String, [core::int?, core::int]) → self::Class<core::String, core::int>};
+  bNamed<core::int>(0, 0){(core::int, [core::int?, core::int]) → self::Class<core::int, core::int>};
+  bNamed<core::String>("", 0, 87){(core::String, [core::int?, core::int]) → self::Class<core::String, core::int>};
+  bFact<core::int>(0){(core::int, {b: core::int?, c: core::int}) → self::Class<core::int, core::int>};
+  bFact<core::String>("", b: 0){(core::String, {b: core::int?, c: core::int}) → self::Class<core::String, core::int>};
+  bFact<core::int>(0, c: 87){(core::int, {b: core::int?, c: core::int}) → self::Class<core::int, core::int>};
+  bFact<core::String>("", c: 87, b: 0){(core::String, {b: core::int?, c: core::int}) → self::Class<core::String, core::int>};
+  bRedirect<core::String>(""){(core::String) → self::Class<core::String, core::int>};
+  bRedirect<core::int>(0){(core::int) → self::Class<core::int, core::int>};
+  (core::bool, core::int) → self::Class<core::bool, core::int> bNewInst = bNew<core::bool>;
+  (core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int> bNamedInst = bNamed<core::bool>;
+  (core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int> bFactInst = bFact<core::bool>;
+  (core::bool) → self::Class<core::bool, core::int> bRedirectInst = bRedirect<core::bool>;
+  bNewInst(true, 0){(core::bool, core::int) → self::Class<core::bool, core::int>};
+  bNamedInst(false){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bNamedInst(true, 0){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bNamedInst(false, 0, 87){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bFactInst(true){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(false, b: 0){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(true, c: 87){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(false, c: 87, b: 0){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bRedirectInst(true){(core::bool) → self::Class<core::bool, core::int>};
+}
+static method _#B#new#tearOff<S extends core::Object? = dynamic>(self::_#B#new#tearOff::S% a, core::int b) → self::Class<self::_#B#new#tearOff::S%, core::int>
+  return new self::Class::•<self::_#B#new#tearOff::S%, core::int>(a, b);
+static method _#B#named#tearOff<S extends core::Object? = dynamic>(self::_#B#named#tearOff::S% a, [core::int? b = #C1, core::int c = #C2]) → self::Class<self::_#B#named#tearOff::S%, core::int>
+  return new self::Class::named<self::_#B#named#tearOff::S%, core::int>(a, b, c);
+static method _#B#fact#tearOff<S extends core::Object? = dynamic>(self::_#B#fact#tearOff::S% a, {core::int? b = #C1, core::int c = #C2}) → self::Class<self::_#B#fact#tearOff::S%, core::int>
+  return self::Class::fact<self::_#B#fact#tearOff::S%, core::int>(a, b: b, c: c);
+static method _#B#redirect#tearOff<S extends core::Object? = dynamic>(self::_#B#redirect#tearOff::S% a) → self::Class<self::_#B#redirect#tearOff::S%, core::int>
+  return self::Class::_#redirect#tearOff<self::_#B#redirect#tearOff::S%, core::int>(a);
+
+library /*isNonNullableByDefault*/;
+import self as self2;
+import "dart:core" as core;
+import "typedef_from.dart" as self;
+
+import "org-dartlang-testcase:///typedef_from.dart";
+
+typedef A<T extends core::Object? = dynamic> = self::Class<T%, core::String>;
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#new#tearOff<T extends core::Object? = dynamic>(self2::_#A#new#tearOff::T% a, core::String b) → self::Class<self2::_#A#new#tearOff::T%, core::String>
+  return new self::Class::•<self2::_#A#new#tearOff::T%, core::String>(a, b);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#named#tearOff<T extends core::Object? = dynamic>(self2::_#A#named#tearOff::T% a, [core::String? b = #C1, core::int c = #C2]) → self::Class<self2::_#A#named#tearOff::T%, core::String>
+  return new self::Class::named<self2::_#A#named#tearOff::T%, core::String>(a, b, c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#fact#tearOff<T extends core::Object? = dynamic>(self2::_#A#fact#tearOff::T% a, {core::String? b = #C1, core::int c = #C2}) → self::Class<self2::_#A#fact#tearOff::T%, core::String>
+  return self::Class::fact<self2::_#A#fact#tearOff::T%, core::String>(a, b: b, c: c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#redirect#tearOff<T extends core::Object? = dynamic>(self2::_#A#redirect#tearOff::T% a) → self::Class<self2::_#A#redirect#tearOff::T%, core::String>
+  return self::Class::_#redirect#tearOff<self2::_#A#redirect#tearOff::T%, core::String>(a);
+
+constants  {
+  #C1 = null
+  #C2 = 42
+  #C3 = static-tearoff self2::_#A#new#tearOff
+  #C4 = static-tearoff self2::_#A#named#tearOff
+  #C5 = static-tearoff self2::_#A#fact#tearOff
+  #C6 = static-tearoff self2::_#A#redirect#tearOff
+  #C7 = static-tearoff self::_#B#new#tearOff
+  #C8 = static-tearoff self::_#B#named#tearOff
+  #C9 = static-tearoff self::_#B#fact#tearOff
+  #C10 = static-tearoff self::_#B#redirect#tearOff
+}
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.textual_outline.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.textual_outline.expect
new file mode 100644
index 0000000..d0244db
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.textual_outline.expect
@@ -0,0 +1,11 @@
+import 'typedef_from_lib.dart';
+part 'typedef_from_part.dart';
+
+main() {}
+
+class Class<S, T> {
+  Class(S a, T b);
+  Class.named(S a, [T? b, int c = 42]);
+  factory Class.fact(S a, {T? b, int c: 42}) => Class.named(a, b, c);
+  factory Class.redirect(S a) = Class.named;
+}
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.textual_outline_modelled.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.textual_outline_modelled.expect
new file mode 100644
index 0000000..704e8ee
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.textual_outline_modelled.expect
@@ -0,0 +1,11 @@
+import 'typedef_from_lib.dart';
+part 'typedef_from_part.dart';
+
+class Class<S, T> {
+  Class(S a, T b);
+  Class.named(S a, [T? b, int c = 42]);
+  factory Class.fact(S a, {T? b, int c: 42}) => Class.named(a, b, c);
+  factory Class.redirect(S a) = Class.named;
+}
+
+main() {}
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.weak.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.weak.expect
new file mode 100644
index 0000000..3f74e4e
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.weak.expect
@@ -0,0 +1,125 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///typedef_from_lib.dart";
+
+part typedef_from_part.dart;
+typedef B<S extends core::Object? = dynamic> = self::Class<S%, core::int>;
+class Class<S extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object {
+  static final field dynamic _redirecting# = <dynamic>[self::Class::redirect]/*isLegacy*/;
+  constructor •(self::Class::S% a, self::Class::T% b) → self::Class<self::Class::S%, self::Class::T%>
+    : super core::Object::•()
+    ;
+  constructor named(self::Class::S% a, [self::Class::T? b = #C1, core::int c = #C2]) → self::Class<self::Class::S%, self::Class::T%>
+    : super core::Object::•()
+    ;
+  static method _#new#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#new#tearOff::S% a, self::Class::_#new#tearOff::T% b) → self::Class<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>
+    return new self::Class::•<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>(a, b);
+  static method _#named#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#named#tearOff::S% a, [self::Class::_#named#tearOff::T? b = #C1, core::int c = #C2]) → self::Class<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>
+    return new self::Class::named<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>(a, b, c);
+  static factory fact<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::fact::S% a, {self::Class::fact::T? b = #C1, core::int c = #C2}) → self::Class<self::Class::fact::S%, self::Class::fact::T%>
+    return new self::Class::named<self::Class::fact::S%, self::Class::fact::T%>(a, b, c);
+  static method _#fact#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#fact#tearOff::S% a, {self::Class::_#fact#tearOff::T? b = #C1, core::int c = #C2}) → self::Class<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>
+    return self::Class::fact<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>(a, b: b, c: c);
+  static factory redirect<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::redirect::S% a) → self::Class<self::Class::redirect::S%, self::Class::redirect::T%>
+    return new self::Class::named<self::Class::redirect::S%, self::Class::redirect::T%>(a);
+  static method _#redirect#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#redirect#tearOff::S% a) → self::Class<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>
+    return new self::Class::named<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>(a);
+}
+static method main() → dynamic {
+  <T extends core::Object? = dynamic>(T%, core::String) → self::Class<T%, core::String> aNew = #C3;
+  <T extends core::Object? = dynamic>(T%, [core::String?, core::int]) → self::Class<T%, core::String> aNamed = #C4;
+  <T extends core::Object? = dynamic>(T%, {b: core::String?, c: core::int}) → self::Class<T%, core::String> aFact = #C5;
+  <T extends core::Object? = dynamic>(T%) → self::Class<T%, core::String> aRedirect = #C6;
+  aNew<core::String>("", ""){(core::String, core::String) → self::Class<core::String, core::String>};
+  aNew<core::int>(0, ""){(core::int, core::String) → self::Class<core::int, core::String>};
+  aNamed<core::String>(""){(core::String, [core::String?, core::int]) → self::Class<core::String, core::String>};
+  aNamed<core::int>(0, ""){(core::int, [core::String?, core::int]) → self::Class<core::int, core::String>};
+  aNamed<core::String>("", "", 87){(core::String, [core::String?, core::int]) → self::Class<core::String, core::String>};
+  aFact<core::int>(0){(core::int, {b: core::String?, c: core::int}) → self::Class<core::int, core::String>};
+  aFact<core::String>("", b: ""){(core::String, {b: core::String?, c: core::int}) → self::Class<core::String, core::String>};
+  aFact<core::int>(0, c: 87){(core::int, {b: core::String?, c: core::int}) → self::Class<core::int, core::String>};
+  aFact<core::String>("", c: 87, b: ""){(core::String, {b: core::String?, c: core::int}) → self::Class<core::String, core::String>};
+  aRedirect<core::String>(""){(core::String) → self::Class<core::String, core::String>};
+  aRedirect<core::int>(0){(core::int) → self::Class<core::int, core::String>};
+  (core::bool, core::String) → self::Class<core::bool, core::String> aNewInst = aNew<core::bool>;
+  (core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String> aNamedInst = aNamed<core::bool>;
+  (core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String> aFactInst = aFact<core::bool>;
+  (core::bool) → self::Class<core::bool, core::String> aRedirectInst = aRedirect<core::bool>;
+  aNewInst(true, ""){(core::bool, core::String) → self::Class<core::bool, core::String>};
+  aNamedInst(false){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aNamedInst(true, ""){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aNamedInst(false, "", 87){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aFactInst(true){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(false, b: ""){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(true, c: 87){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(false, c: 87, b: ""){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aRedirectInst(true){(core::bool) → self::Class<core::bool, core::String>};
+  <S extends core::Object? = dynamic>(S%, core::int) → self::Class<S%, core::int> bNew = #C7;
+  <S extends core::Object? = dynamic>(S%, [core::int?, core::int]) → self::Class<S%, core::int> bNamed = #C8;
+  <S extends core::Object? = dynamic>(S%, {b: core::int?, c: core::int}) → self::Class<S%, core::int> bFact = #C9;
+  <S extends core::Object? = dynamic>(S%) → self::Class<S%, core::int> bRedirect = #C10;
+  bNew<core::String>("", 0){(core::String, core::int) → self::Class<core::String, core::int>};
+  bNew<core::int>(0, 0){(core::int, core::int) → self::Class<core::int, core::int>};
+  bNamed<core::String>(""){(core::String, [core::int?, core::int]) → self::Class<core::String, core::int>};
+  bNamed<core::int>(0, 0){(core::int, [core::int?, core::int]) → self::Class<core::int, core::int>};
+  bNamed<core::String>("", 0, 87){(core::String, [core::int?, core::int]) → self::Class<core::String, core::int>};
+  bFact<core::int>(0){(core::int, {b: core::int?, c: core::int}) → self::Class<core::int, core::int>};
+  bFact<core::String>("", b: 0){(core::String, {b: core::int?, c: core::int}) → self::Class<core::String, core::int>};
+  bFact<core::int>(0, c: 87){(core::int, {b: core::int?, c: core::int}) → self::Class<core::int, core::int>};
+  bFact<core::String>("", c: 87, b: 0){(core::String, {b: core::int?, c: core::int}) → self::Class<core::String, core::int>};
+  bRedirect<core::String>(""){(core::String) → self::Class<core::String, core::int>};
+  bRedirect<core::int>(0){(core::int) → self::Class<core::int, core::int>};
+  (core::bool, core::int) → self::Class<core::bool, core::int> bNewInst = bNew<core::bool>;
+  (core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int> bNamedInst = bNamed<core::bool>;
+  (core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int> bFactInst = bFact<core::bool>;
+  (core::bool) → self::Class<core::bool, core::int> bRedirectInst = bRedirect<core::bool>;
+  bNewInst(true, 0){(core::bool, core::int) → self::Class<core::bool, core::int>};
+  bNamedInst(false){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bNamedInst(true, 0){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bNamedInst(false, 0, 87){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bFactInst(true){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(false, b: 0){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(true, c: 87){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(false, c: 87, b: 0){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bRedirectInst(true){(core::bool) → self::Class<core::bool, core::int>};
+}
+static method _#B#new#tearOff<S extends core::Object? = dynamic>(self::_#B#new#tearOff::S% a, core::int b) → self::Class<self::_#B#new#tearOff::S%, core::int>
+  return new self::Class::•<self::_#B#new#tearOff::S%, core::int>(a, b);
+static method _#B#named#tearOff<S extends core::Object? = dynamic>(self::_#B#named#tearOff::S% a, [core::int? b = #C1, core::int c = #C2]) → self::Class<self::_#B#named#tearOff::S%, core::int>
+  return new self::Class::named<self::_#B#named#tearOff::S%, core::int>(a, b, c);
+static method _#B#fact#tearOff<S extends core::Object? = dynamic>(self::_#B#fact#tearOff::S% a, {core::int? b = #C1, core::int c = #C2}) → self::Class<self::_#B#fact#tearOff::S%, core::int>
+  return self::Class::fact<self::_#B#fact#tearOff::S%, core::int>(a, b: b, c: c);
+static method _#B#redirect#tearOff<S extends core::Object? = dynamic>(self::_#B#redirect#tearOff::S% a) → self::Class<self::_#B#redirect#tearOff::S%, core::int>
+  return self::Class::_#redirect#tearOff<self::_#B#redirect#tearOff::S%, core::int>(a);
+
+library /*isNonNullableByDefault*/;
+import self as self2;
+import "dart:core" as core;
+import "typedef_from.dart" as self;
+
+import "org-dartlang-testcase:///typedef_from.dart";
+
+typedef A<T extends core::Object? = dynamic> = self::Class<T%, core::String>;
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#new#tearOff<T extends core::Object? = dynamic>(self2::_#A#new#tearOff::T% a, core::String b) → self::Class<self2::_#A#new#tearOff::T%, core::String>
+  return new self::Class::•<self2::_#A#new#tearOff::T%, core::String>(a, b);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#named#tearOff<T extends core::Object? = dynamic>(self2::_#A#named#tearOff::T% a, [core::String? b = #C1, core::int c = #C2]) → self::Class<self2::_#A#named#tearOff::T%, core::String>
+  return new self::Class::named<self2::_#A#named#tearOff::T%, core::String>(a, b, c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#fact#tearOff<T extends core::Object? = dynamic>(self2::_#A#fact#tearOff::T% a, {core::String? b = #C1, core::int c = #C2}) → self::Class<self2::_#A#fact#tearOff::T%, core::String>
+  return self::Class::fact<self2::_#A#fact#tearOff::T%, core::String>(a, b: b, c: c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#redirect#tearOff<T extends core::Object? = dynamic>(self2::_#A#redirect#tearOff::T% a) → self::Class<self2::_#A#redirect#tearOff::T%, core::String>
+  return self::Class::_#redirect#tearOff<self2::_#A#redirect#tearOff::T%, core::String>(a);
+
+constants  {
+  #C1 = null
+  #C2 = 42
+  #C3 = static-tearoff self2::_#A#new#tearOff
+  #C4 = static-tearoff self2::_#A#named#tearOff
+  #C5 = static-tearoff self2::_#A#fact#tearOff
+  #C6 = static-tearoff self2::_#A#redirect#tearOff
+  #C7 = static-tearoff self::_#B#new#tearOff
+  #C8 = static-tearoff self::_#B#named#tearOff
+  #C9 = static-tearoff self::_#B#fact#tearOff
+  #C10 = static-tearoff self::_#B#redirect#tearOff
+}
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.weak.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.weak.outline.expect
new file mode 100644
index 0000000..d0d9059
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.weak.outline.expect
@@ -0,0 +1,54 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///typedef_from_lib.dart";
+
+part typedef_from_part.dart;
+typedef B<S extends core::Object? = dynamic> = self::Class<S%, core::int>;
+class Class<S extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object {
+  static final field dynamic _redirecting# = <dynamic>[self::Class::redirect]/*isLegacy*/;
+  constructor •(self::Class::S% a, self::Class::T% b) → self::Class<self::Class::S%, self::Class::T%>
+    ;
+  constructor named(self::Class::S% a, [self::Class::T? b, core::int c]) → self::Class<self::Class::S%, self::Class::T%>
+    ;
+  static method _#new#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#new#tearOff::S% a, self::Class::_#new#tearOff::T% b) → self::Class<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>
+    return new self::Class::•<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>(a, b);
+  static method _#named#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#named#tearOff::S% a, [self::Class::_#named#tearOff::T? b, core::int c]) → self::Class<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>
+    return new self::Class::named<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>(a, b, c);
+  static factory fact<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::fact::S% a, {self::Class::fact::T? b, core::int c}) → self::Class<self::Class::fact::S%, self::Class::fact::T%>
+    ;
+  static method _#fact#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#fact#tearOff::S% a, {self::Class::_#fact#tearOff::T? b, core::int c}) → self::Class<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>
+    return self::Class::fact<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>(a, b: b, c: c);
+  static factory redirect<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::redirect::S% a) → self::Class<self::Class::redirect::S%, self::Class::redirect::T%>
+    return new self::Class::named<self::Class::redirect::S%, self::Class::redirect::T%>(a);
+  static method _#redirect#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#redirect#tearOff::S% a) → self::Class<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>
+    return new self::Class::named<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>(a);
+}
+static method main() → dynamic
+  ;
+static method _#B#new#tearOff<S extends core::Object? = dynamic>(self::_#B#new#tearOff::S% a, core::int b) → self::Class<self::_#B#new#tearOff::S%, core::int>
+  return new self::Class::•<self::_#B#new#tearOff::S%, core::int>(a, b);
+static method _#B#named#tearOff<S extends core::Object? = dynamic>(self::_#B#named#tearOff::S% a, [core::int? b, core::int c]) → self::Class<self::_#B#named#tearOff::S%, core::int>
+  return new self::Class::named<self::_#B#named#tearOff::S%, core::int>(a, b, c);
+static method _#B#fact#tearOff<S extends core::Object? = dynamic>(self::_#B#fact#tearOff::S% a, {core::int? b, core::int c}) → self::Class<self::_#B#fact#tearOff::S%, core::int>
+  return self::Class::fact<self::_#B#fact#tearOff::S%, core::int>(a, b: b, c: c);
+static method _#B#redirect#tearOff<S extends core::Object? = dynamic>(self::_#B#redirect#tearOff::S% a) → self::Class<self::_#B#redirect#tearOff::S%, core::int>
+  return self::Class::_#redirect#tearOff<self::_#B#redirect#tearOff::S%, core::int>(a);
+
+library /*isNonNullableByDefault*/;
+import self as self2;
+import "dart:core" as core;
+import "typedef_from.dart" as self;
+
+import "org-dartlang-testcase:///typedef_from.dart";
+
+typedef A<T extends core::Object? = dynamic> = self::Class<T%, core::String>;
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#new#tearOff<T extends core::Object? = dynamic>(self2::_#A#new#tearOff::T% a, core::String b) → self::Class<self2::_#A#new#tearOff::T%, core::String>
+  return new self::Class::•<self2::_#A#new#tearOff::T%, core::String>(a, b);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#named#tearOff<T extends core::Object? = dynamic>(self2::_#A#named#tearOff::T% a, [core::String? b, core::int c]) → self::Class<self2::_#A#named#tearOff::T%, core::String>
+  return new self::Class::named<self2::_#A#named#tearOff::T%, core::String>(a, b, c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#fact#tearOff<T extends core::Object? = dynamic>(self2::_#A#fact#tearOff::T% a, {core::String? b, core::int c}) → self::Class<self2::_#A#fact#tearOff::T%, core::String>
+  return self::Class::fact<self2::_#A#fact#tearOff::T%, core::String>(a, b: b, c: c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#redirect#tearOff<T extends core::Object? = dynamic>(self2::_#A#redirect#tearOff::T% a) → self::Class<self2::_#A#redirect#tearOff::T%, core::String>
+  return self::Class::_#redirect#tearOff<self2::_#A#redirect#tearOff::T%, core::String>(a);
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.weak.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.weak.transformed.expect
new file mode 100644
index 0000000..3f74e4e
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from.dart.weak.transformed.expect
@@ -0,0 +1,125 @@
+library /*isNonNullableByDefault*/;
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///typedef_from_lib.dart";
+
+part typedef_from_part.dart;
+typedef B<S extends core::Object? = dynamic> = self::Class<S%, core::int>;
+class Class<S extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object {
+  static final field dynamic _redirecting# = <dynamic>[self::Class::redirect]/*isLegacy*/;
+  constructor •(self::Class::S% a, self::Class::T% b) → self::Class<self::Class::S%, self::Class::T%>
+    : super core::Object::•()
+    ;
+  constructor named(self::Class::S% a, [self::Class::T? b = #C1, core::int c = #C2]) → self::Class<self::Class::S%, self::Class::T%>
+    : super core::Object::•()
+    ;
+  static method _#new#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#new#tearOff::S% a, self::Class::_#new#tearOff::T% b) → self::Class<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>
+    return new self::Class::•<self::Class::_#new#tearOff::S%, self::Class::_#new#tearOff::T%>(a, b);
+  static method _#named#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#named#tearOff::S% a, [self::Class::_#named#tearOff::T? b = #C1, core::int c = #C2]) → self::Class<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>
+    return new self::Class::named<self::Class::_#named#tearOff::S%, self::Class::_#named#tearOff::T%>(a, b, c);
+  static factory fact<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::fact::S% a, {self::Class::fact::T? b = #C1, core::int c = #C2}) → self::Class<self::Class::fact::S%, self::Class::fact::T%>
+    return new self::Class::named<self::Class::fact::S%, self::Class::fact::T%>(a, b, c);
+  static method _#fact#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#fact#tearOff::S% a, {self::Class::_#fact#tearOff::T? b = #C1, core::int c = #C2}) → self::Class<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>
+    return self::Class::fact<self::Class::_#fact#tearOff::S%, self::Class::_#fact#tearOff::T%>(a, b: b, c: c);
+  static factory redirect<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::redirect::S% a) → self::Class<self::Class::redirect::S%, self::Class::redirect::T%>
+    return new self::Class::named<self::Class::redirect::S%, self::Class::redirect::T%>(a);
+  static method _#redirect#tearOff<S extends core::Object? = dynamic, T extends core::Object? = dynamic>(self::Class::_#redirect#tearOff::S% a) → self::Class<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>
+    return new self::Class::named<self::Class::_#redirect#tearOff::S%, self::Class::_#redirect#tearOff::T%>(a);
+}
+static method main() → dynamic {
+  <T extends core::Object? = dynamic>(T%, core::String) → self::Class<T%, core::String> aNew = #C3;
+  <T extends core::Object? = dynamic>(T%, [core::String?, core::int]) → self::Class<T%, core::String> aNamed = #C4;
+  <T extends core::Object? = dynamic>(T%, {b: core::String?, c: core::int}) → self::Class<T%, core::String> aFact = #C5;
+  <T extends core::Object? = dynamic>(T%) → self::Class<T%, core::String> aRedirect = #C6;
+  aNew<core::String>("", ""){(core::String, core::String) → self::Class<core::String, core::String>};
+  aNew<core::int>(0, ""){(core::int, core::String) → self::Class<core::int, core::String>};
+  aNamed<core::String>(""){(core::String, [core::String?, core::int]) → self::Class<core::String, core::String>};
+  aNamed<core::int>(0, ""){(core::int, [core::String?, core::int]) → self::Class<core::int, core::String>};
+  aNamed<core::String>("", "", 87){(core::String, [core::String?, core::int]) → self::Class<core::String, core::String>};
+  aFact<core::int>(0){(core::int, {b: core::String?, c: core::int}) → self::Class<core::int, core::String>};
+  aFact<core::String>("", b: ""){(core::String, {b: core::String?, c: core::int}) → self::Class<core::String, core::String>};
+  aFact<core::int>(0, c: 87){(core::int, {b: core::String?, c: core::int}) → self::Class<core::int, core::String>};
+  aFact<core::String>("", c: 87, b: ""){(core::String, {b: core::String?, c: core::int}) → self::Class<core::String, core::String>};
+  aRedirect<core::String>(""){(core::String) → self::Class<core::String, core::String>};
+  aRedirect<core::int>(0){(core::int) → self::Class<core::int, core::String>};
+  (core::bool, core::String) → self::Class<core::bool, core::String> aNewInst = aNew<core::bool>;
+  (core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String> aNamedInst = aNamed<core::bool>;
+  (core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String> aFactInst = aFact<core::bool>;
+  (core::bool) → self::Class<core::bool, core::String> aRedirectInst = aRedirect<core::bool>;
+  aNewInst(true, ""){(core::bool, core::String) → self::Class<core::bool, core::String>};
+  aNamedInst(false){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aNamedInst(true, ""){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aNamedInst(false, "", 87){(core::bool, [core::String?, core::int]) → self::Class<core::bool, core::String>};
+  aFactInst(true){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(false, b: ""){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(true, c: 87){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aFactInst(false, c: 87, b: ""){(core::bool, {b: core::String?, c: core::int}) → self::Class<core::bool, core::String>};
+  aRedirectInst(true){(core::bool) → self::Class<core::bool, core::String>};
+  <S extends core::Object? = dynamic>(S%, core::int) → self::Class<S%, core::int> bNew = #C7;
+  <S extends core::Object? = dynamic>(S%, [core::int?, core::int]) → self::Class<S%, core::int> bNamed = #C8;
+  <S extends core::Object? = dynamic>(S%, {b: core::int?, c: core::int}) → self::Class<S%, core::int> bFact = #C9;
+  <S extends core::Object? = dynamic>(S%) → self::Class<S%, core::int> bRedirect = #C10;
+  bNew<core::String>("", 0){(core::String, core::int) → self::Class<core::String, core::int>};
+  bNew<core::int>(0, 0){(core::int, core::int) → self::Class<core::int, core::int>};
+  bNamed<core::String>(""){(core::String, [core::int?, core::int]) → self::Class<core::String, core::int>};
+  bNamed<core::int>(0, 0){(core::int, [core::int?, core::int]) → self::Class<core::int, core::int>};
+  bNamed<core::String>("", 0, 87){(core::String, [core::int?, core::int]) → self::Class<core::String, core::int>};
+  bFact<core::int>(0){(core::int, {b: core::int?, c: core::int}) → self::Class<core::int, core::int>};
+  bFact<core::String>("", b: 0){(core::String, {b: core::int?, c: core::int}) → self::Class<core::String, core::int>};
+  bFact<core::int>(0, c: 87){(core::int, {b: core::int?, c: core::int}) → self::Class<core::int, core::int>};
+  bFact<core::String>("", c: 87, b: 0){(core::String, {b: core::int?, c: core::int}) → self::Class<core::String, core::int>};
+  bRedirect<core::String>(""){(core::String) → self::Class<core::String, core::int>};
+  bRedirect<core::int>(0){(core::int) → self::Class<core::int, core::int>};
+  (core::bool, core::int) → self::Class<core::bool, core::int> bNewInst = bNew<core::bool>;
+  (core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int> bNamedInst = bNamed<core::bool>;
+  (core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int> bFactInst = bFact<core::bool>;
+  (core::bool) → self::Class<core::bool, core::int> bRedirectInst = bRedirect<core::bool>;
+  bNewInst(true, 0){(core::bool, core::int) → self::Class<core::bool, core::int>};
+  bNamedInst(false){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bNamedInst(true, 0){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bNamedInst(false, 0, 87){(core::bool, [core::int?, core::int]) → self::Class<core::bool, core::int>};
+  bFactInst(true){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(false, b: 0){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(true, c: 87){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bFactInst(false, c: 87, b: 0){(core::bool, {b: core::int?, c: core::int}) → self::Class<core::bool, core::int>};
+  bRedirectInst(true){(core::bool) → self::Class<core::bool, core::int>};
+}
+static method _#B#new#tearOff<S extends core::Object? = dynamic>(self::_#B#new#tearOff::S% a, core::int b) → self::Class<self::_#B#new#tearOff::S%, core::int>
+  return new self::Class::•<self::_#B#new#tearOff::S%, core::int>(a, b);
+static method _#B#named#tearOff<S extends core::Object? = dynamic>(self::_#B#named#tearOff::S% a, [core::int? b = #C1, core::int c = #C2]) → self::Class<self::_#B#named#tearOff::S%, core::int>
+  return new self::Class::named<self::_#B#named#tearOff::S%, core::int>(a, b, c);
+static method _#B#fact#tearOff<S extends core::Object? = dynamic>(self::_#B#fact#tearOff::S% a, {core::int? b = #C1, core::int c = #C2}) → self::Class<self::_#B#fact#tearOff::S%, core::int>
+  return self::Class::fact<self::_#B#fact#tearOff::S%, core::int>(a, b: b, c: c);
+static method _#B#redirect#tearOff<S extends core::Object? = dynamic>(self::_#B#redirect#tearOff::S% a) → self::Class<self::_#B#redirect#tearOff::S%, core::int>
+  return self::Class::_#redirect#tearOff<self::_#B#redirect#tearOff::S%, core::int>(a);
+
+library /*isNonNullableByDefault*/;
+import self as self2;
+import "dart:core" as core;
+import "typedef_from.dart" as self;
+
+import "org-dartlang-testcase:///typedef_from.dart";
+
+typedef A<T extends core::Object? = dynamic> = self::Class<T%, core::String>;
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#new#tearOff<T extends core::Object? = dynamic>(self2::_#A#new#tearOff::T% a, core::String b) → self::Class<self2::_#A#new#tearOff::T%, core::String>
+  return new self::Class::•<self2::_#A#new#tearOff::T%, core::String>(a, b);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#named#tearOff<T extends core::Object? = dynamic>(self2::_#A#named#tearOff::T% a, [core::String? b = #C1, core::int c = #C2]) → self::Class<self2::_#A#named#tearOff::T%, core::String>
+  return new self::Class::named<self2::_#A#named#tearOff::T%, core::String>(a, b, c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#fact#tearOff<T extends core::Object? = dynamic>(self2::_#A#fact#tearOff::T% a, {core::String? b = #C1, core::int c = #C2}) → self::Class<self2::_#A#fact#tearOff::T%, core::String>
+  return self::Class::fact<self2::_#A#fact#tearOff::T%, core::String>(a, b: b, c: c);
+static method /* from org-dartlang-testcase:///typedef_from.dart */ _#A#redirect#tearOff<T extends core::Object? = dynamic>(self2::_#A#redirect#tearOff::T% a) → self::Class<self2::_#A#redirect#tearOff::T%, core::String>
+  return self::Class::_#redirect#tearOff<self2::_#A#redirect#tearOff::T%, core::String>(a);
+
+constants  {
+  #C1 = null
+  #C2 = 42
+  #C3 = static-tearoff self2::_#A#new#tearOff
+  #C4 = static-tearoff self2::_#A#named#tearOff
+  #C5 = static-tearoff self2::_#A#fact#tearOff
+  #C6 = static-tearoff self2::_#A#redirect#tearOff
+  #C7 = static-tearoff self::_#B#new#tearOff
+  #C8 = static-tearoff self::_#B#named#tearOff
+  #C9 = static-tearoff self::_#B#fact#tearOff
+  #C10 = static-tearoff self::_#B#redirect#tearOff
+}
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.strong.expect
index ad13134..90eb13b 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.strong.expect
@@ -68,13 +68,13 @@
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
     throw "Expected ${expected}, actual ${actual}";
 }
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → mai::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → mai::A<self::_#H#fact#tearOff::Y%>
   return mai::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
   return mai::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
   return new mai::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → mai::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → mai::A<self::_#H#named#tearOff::Y%>
   return new mai::A::named<self::_#H#named#tearOff::Y%>(a, b);
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.strong.transformed.expect
index ad13134..90eb13b 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.strong.transformed.expect
@@ -68,13 +68,13 @@
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
     throw "Expected ${expected}, actual ${actual}";
 }
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → mai::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → mai::A<self::_#H#fact#tearOff::Y%>
   return mai::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
   return mai::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
   return new mai::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → mai::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → mai::A<self::_#H#named#tearOff::Y%>
   return new mai::A::named<self::_#H#named#tearOff::Y%>(a, b);
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.expect
index ad13134..90eb13b 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.expect
@@ -68,13 +68,13 @@
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
     throw "Expected ${expected}, actual ${actual}";
 }
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → mai::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → mai::A<self::_#H#fact#tearOff::Y%>
   return mai::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
   return mai::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
   return new mai::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → mai::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → mai::A<self::_#H#named#tearOff::Y%>
   return new mai::A::named<self::_#H#named#tearOff::Y%>(a, b);
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.outline.expect
index cd0b2f3..0e4f276 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.outline.expect
@@ -18,13 +18,13 @@
   ;
 static method expect(dynamic expected, dynamic actual) → dynamic
   ;
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b, core::int c}) → mai::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b, core::int c}) → mai::A<self::_#H#fact#tearOff::Y%>
   return mai::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
   return mai::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
   return new mai::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b]) → mai::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b]) → mai::A<self::_#H#named#tearOff::Y%>
   return new mai::A::named<self::_#H#named#tearOff::Y%>(a, b);
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.transformed.expect
index ad13134..90eb13b 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_dill/main.dart.weak.transformed.expect
@@ -68,13 +68,13 @@
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
     throw "Expected ${expected}, actual ${actual}";
 }
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → mai::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → mai::A<self::_#H#fact#tearOff::Y%>
   return mai::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#redirect#tearOff::Y%>
   return mai::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → mai::A<self::_#H#new#tearOff::Y%>
   return new mai::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → mai::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///main_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → mai::A<self::_#H#named#tearOff::Y%>
   return new mai::A::named<self::_#H#named#tearOff::Y%>(a, b);
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_lib.dart b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_lib.dart
new file mode 100644
index 0000000..ff58b28
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2021, 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 'typedef_from.dart';
+
+typedef A<T> = Class<T, String>;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_part.dart b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_part.dart
new file mode 100644
index 0000000..5710fab
--- /dev/null
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_from_part.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2021, 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.
+
+part of 'typedef_from.dart';
+
+typedef B<S> = Class<S, int>;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.strong.expect
index 4a19911..81462df 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.strong.expect
@@ -68,13 +68,13 @@
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
     throw "Expected ${expected}, actual ${actual}";
 }
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
   return new typ::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → typ::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → typ::A<self::_#H#named#tearOff::Y%>
   return new typ::A::named<self::_#H#named#tearOff::Y%>(a, b);
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → typ::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → typ::A<self::_#H#fact#tearOff::Y%>
   return typ::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
   return typ::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.strong.transformed.expect
index 4a19911..81462df 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.strong.transformed.expect
@@ -68,13 +68,13 @@
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
     throw "Expected ${expected}, actual ${actual}";
 }
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
   return new typ::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → typ::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → typ::A<self::_#H#named#tearOff::Y%>
   return new typ::A::named<self::_#H#named#tearOff::Y%>(a, b);
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → typ::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → typ::A<self::_#H#fact#tearOff::Y%>
   return typ::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
   return typ::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.expect
index 4a19911..81462df 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.expect
@@ -68,13 +68,13 @@
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
     throw "Expected ${expected}, actual ${actual}";
 }
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
   return new typ::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → typ::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → typ::A<self::_#H#named#tearOff::Y%>
   return new typ::A::named<self::_#H#named#tearOff::Y%>(a, b);
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → typ::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → typ::A<self::_#H#fact#tearOff::Y%>
   return typ::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
   return typ::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.outline.expect
index cca6cc2..b6ebfa4 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.outline.expect
@@ -18,13 +18,13 @@
   ;
 static method expect(dynamic expected, dynamic actual) → dynamic
   ;
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
   return new typ::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b]) → typ::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b]) → typ::A<self::_#H#named#tearOff::Y%>
   return new typ::A::named<self::_#H#named#tearOff::Y%>(a, b);
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b, core::int c}) → typ::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b, core::int c}) → typ::A<self::_#H#fact#tearOff::Y%>
   return typ::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
   return typ::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.transformed.expect
index 4a19911..81462df 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/typedef_identical.dart.weak.transformed.expect
@@ -68,13 +68,13 @@
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
     throw "Expected ${expected}, actual ${actual}";
 }
-static method _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#new#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#new#tearOff::Y%>
   return new typ::A::•<self::_#H#new#tearOff::Y%>();
-static method _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → typ::A<self::_#H#named#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#named#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#named#tearOff::Y% a, [core::int? b = #C9]) → typ::A<self::_#H#named#tearOff::Y%>
   return new typ::A::named<self::_#H#named#tearOff::Y%>(a, b);
-static method _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → typ::A<self::_#H#fact#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#fact#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::_#H#fact#tearOff::Y% a, {core::int? b = #C9, core::int c = #C10}) → typ::A<self::_#H#fact#tearOff::Y%>
   return typ::A::fact<self::_#H#fact#tearOff::Y%>(a, b: b, c: c);
-static method _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
+static method /* from org-dartlang-testcase:///typedef_identical_lib.dart */ _#H#redirect#tearOff<unrelated X extends core::Object? = dynamic, Y extends core::Object? = dynamic>() → typ::A<self::_#H#redirect#tearOff::Y%>
   return typ::A::_#redirect#tearOff<self::_#H#redirect#tearOff::Y%>();
 
 library /*isNonNullableByDefault*/;
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.strong.expect b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.strong.expect
index 7e82df9..94e4635 100644
--- a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.strong.expect
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.strong.expect
@@ -36,17 +36,17 @@
   core::String a;
 }
 static method main() → dynamic {}
-static method _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
-static method _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
 
 constants  {
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.strong.transformed.expect b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.strong.transformed.expect
index 7e82df9..94e4635 100644
--- a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.strong.transformed.expect
@@ -36,17 +36,17 @@
   core::String a;
 }
 static method main() → dynamic {}
-static method _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
-static method _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
 
 constants  {
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.expect b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.expect
index 7e82df9..94e4635 100644
--- a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.expect
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.expect
@@ -36,17 +36,17 @@
   core::String a;
 }
 static method main() → dynamic {}
-static method _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
-static method _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
 
 constants  {
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.outline.expect b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.outline.expect
index 3fd24b5..782f6eb 100644
--- a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.outline.expect
@@ -28,15 +28,15 @@
   ;
 static method main() → dynamic
   ;
-static method _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start, core::int? end]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start, core::int? end]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
-static method _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start, core::int? end]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start, core::int? end]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.transformed.expect b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.transformed.expect
index 7e82df9..94e4635 100644
--- a/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/aliased_checks_in_typedef.dart.weak.transformed.expect
@@ -36,17 +36,17 @@
   core::String a;
 }
 static method main() → dynamic {}
-static method _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#A#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
-static method _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCodes#tearOff<unrelated X extends core::int>(core::Iterable<core::int> charCodes, [core::int start = #C1, core::int? end = #C2]) → core::String
   return core::String::fromCharCodes(charCodes, start, end);
-static method _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromCharCode#tearOff<unrelated X extends core::int>(core::int charCode) → core::String
   return core::String::fromCharCode(charCode);
-static method _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/string_patch.dart */ _#B#fromEnvironment#tearOff<unrelated X extends core::int>(core::String name, {core::String defaultValue = #C3}) → core::String
   return core::String::fromEnvironment(name, defaultValue: defaultValue);
 
 constants  {