Reduce strong mode errors and warnings

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

Index: pkg/front_end/lib/src/fasta/builder/member_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/member_builder.dart b/pkg/front_end/lib/src/fasta/builder/member_builder.dart
index f4cb6f1bfeea797284ae45a77f49b587c2fbce50..1ee723b11504566d160b6e9cda09622b8f100c1b 100644
--- a/pkg/front_end/lib/src/fasta/builder/member_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/member_builder.dart
@@ -9,8 +9,14 @@ import 'builder.dart' show
     ClassBuilder,
     ModifierBuilder;
 
+import 'package:meta/meta.dart' show
+    virtual;
+
 abstract class MemberBuilder extends ModifierBuilder {
-  Builder parent;
+  // TODO(sigmund): remove @virtual, should not be needed, see #28601
+  @virtual Builder parent;
+
+  String get name;

[Siggi Cherem (dart-lang), 2017/02/02 04:26:58]

I wasn't sure about adding it here, but there wasn't any common superclass of
Field and Procedure that could have this (there is one place where you read
member.name to provide an error message)

 
   bool get isInstanceMember => isClassMember && !isStatic;