anchor.diff:    _SpecialTypeMirrorImpl(String name) : simpleName = _s(name);
   
     final bool isPrivate = false;
  +  final DeclarationMirror owner = null;
  +  final Symbol simpleName;
     final bool isTopLevel = true;
  -
     // Fixed length 0, therefore immutable.
     final List<InstanceMirror> metadata = new List(0);
   
  -  final DeclarationMirror owner = null;
  -  final Symbol simpleName;
  -
     SourceLocation get location {
  -    throw new UnimplementedError(
  -        'TypeMirror.location is not implemented');
  -  }
  -
  -  Symbol get qualifiedName {
  -    return simpleName;
  -  }
  -
  -  String toString() => "TypeMirror on '${_n(simpleName)}'";
  +    throw new UnimplementedError('TypeMirror.location is not implemented');
  +  }
  +
  +  Symbol get qualifiedName => simpleName;
   
     // TODO(11955): Remove once dynamicType and voidType are canonical objects in
     // the object store.
  
positive.code:   final bool isTopLevel = false;
  
    SourceLocation get location {
      throw new UnimplementedError(
          'LibraryMirror.location is not implemented');
    }
  
    final Uri uri;
  
    Map<Symbol, Mirror> _members;
  
    Map<Symbol, Mirror> get members {
      if (_members == null) {
        _members = _makeMemberMap(_computeMembers(_reflectee));
  
negative.code:   }
  
    int get hashCode => simpleName.hashCode;
  
    String toString() => "TypeMirror on '${_n(simpleName)}'";
  }
  
  class _Mirrors {
  