Prepare for separate setter scope.

pkg/analyzer/test/generated/parser_fasta_test.dart

Index: pkg/analyzer/test/generated/parser_fasta_test.dart
diff --git a/pkg/analyzer/test/generated/parser_fasta_test.dart b/pkg/analyzer/test/generated/parser_fasta_test.dart
index a36d49d9780da926834bd134ca605ab11c301e4f..8a2cbe406708860670d3cdd1c05f20e7ddd196c1 100644
--- a/pkg/analyzer/test/generated/parser_fasta_test.dart
+++ b/pkg/analyzer/test/generated/parser_fasta_test.dart
@@ -1037,11 +1037,12 @@ class ScopeProxy implements Scope {
 
   @override
   Scope createNestedScope({bool isModifiable: true}) {
-    return new Scope(<String, Builder>{}, this, isModifiable: isModifiable);
+    return new Scope.nested(this, isModifiable: isModifiable);
   }
 
   @override
-  Builder lookup(String name, int charOffset, Uri fileUri) =>
+  Builder lookup(String name, int charOffset, Uri fileUri,
+          {bool isInstanceScope: true}) =>
       _locals.putIfAbsent(name, () => new BuilderProxy());
 
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);