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

pkg/front_end/lib/src/fasta/builder/named_mixin_application_builder.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.named_mixin_application_builder;
 
 import 'builder.dart'
     show
-        Builder,
         ClassBuilder,
         LibraryBuilder,
+        MemberBuilder,
         MetadataBuilder,
+        Scope,
         TypeBuilder,
         TypeVariableBuilder;
 
 abstract class NamedMixinApplicationBuilder<T extends TypeBuilder, R>
     extends ClassBuilder<T, R> {
   NamedMixinApplicationBuilder(
       List<MetadataBuilder> metadata,
       String name,
       List<TypeVariableBuilder> typeVariables,
       int modifiers,
       T supertype,
       List<T> interfaces,
       LibraryBuilder parent,
       int charOffset)
-      : super(metadata, modifiers, name, typeVariables, supertype, interfaces,
-            <String, Builder>{}, parent, charOffset);
+      : super(
+            metadata,
+            modifiers,
+            name,
+            typeVariables,
+            supertype,
+            interfaces,
+            new Scope(<String, MemberBuilder>{}, <String, MemberBuilder>{},
+                parent.scope.withTypeVariables(typeVariables),
+                isModifiable: false),
+            new Scope(<String, MemberBuilder>{}, null, null,
+                isModifiable: false),
+            parent,
+            charOffset);
 
   T get mixinApplication => supertype;
 }