anchor.diff:      show Compiler;
   import '../constants/constructors.dart';
   import '../constants/expressions.dart';
  +import '../core_types.dart';
   import '../dart_types.dart';
   import '../elements/elements.dart';
   import '../elements/modelx.dart' show
  
positive.code:   Element lookupLocalMember(String memberName) {
      return _unsupported('lookupLocalMember');
    }
  }
negative.code:   bool get hasLocalScopeMembers => _unsupported('hasLocalScopeMembers');
  
    @override
    bool implementsFunction(CoreClasses coreClasses) {
      return _unsupported('implementsFunction');
    }
  
  