Create separate scopes for constructors, setters, and other members.

pkg/front_end/lib/src/fasta/kernel/kernel_target.dart

 // Copyright (c) 2016, 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.
 
 library fasta.kernel_target;
 
 import 'dart:async' show Future;
 
 import 'dart:io' show File, IOSink;
 
@@ skipping 410 matching lines @@
 
   /// If [builder] doesn't have a constructors, install the defaults.
   void installDefaultConstructor(SourceClassBuilder builder) {
     if (builder.cls.isMixinApplication) {
       // We have to test if builder.cls is a mixin application. [builder] may
       // think it's a mixin application, but if its mixed-in type couldn't be
       // resolved, the target class won't be a mixin application and we need
       // to add a default constructor to complete error recovery.
       return;
     }
-    if (builder.constructors.isNotEmpty) return;
+    if (builder.constructors.local.isNotEmpty) return;
 
     /// Quotes below are from [Dart Programming Language Specification, 4th
     /// Edition](
     /// https://ecma-international.org/publications/files/ECMA-ST/ECMA-408.pdf):
     if (builder is NamedMixinApplicationBuilder) {
       /// >A mixin application of the form S with M; defines a class C with
       /// >superclass S.
       /// >...
 
       /// >Let LM be the library in which M is declared. For each generative
@@ skipping 254 matching lines @@
   }
   for (Constructor constructor in superclass.constructors) {
     if (constructor.name.name.isEmpty) {
       return constructor.function.requiredParameterCount == 0
           ? constructor
           : null;
     }
   }
   return null;
 }