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

pkg/front_end/lib/src/fasta/builder/named_mixin_application_builder.dart

Index: pkg/front_end/lib/src/fasta/builder/named_mixin_application_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/named_mixin_application_builder.dart b/pkg/front_end/lib/src/fasta/builder/named_mixin_application_builder.dart
index 1947b139848f4dc023f1c50e5c3cabc755996db7..3fff6d285952b0990eca4986dc456dc71d20cf2e 100644
--- a/pkg/front_end/lib/src/fasta/builder/named_mixin_application_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/named_mixin_application_builder.dart
@@ -6,10 +6,11 @@ library fasta.named_mixin_application_builder;
 
 import 'builder.dart'
     show
-        Builder,
         ClassBuilder,
         LibraryBuilder,
+        MemberBuilder,
         MetadataBuilder,
+        Scope,
         TypeBuilder,
         TypeVariableBuilder;
 
@@ -24,8 +25,20 @@ abstract class NamedMixinApplicationBuilder<T extends TypeBuilder, R>
       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;
 }