anchor.diff:  
   class SelectorKind {
     final String name;
  -  final int hashCode;
  -  const SelectorKind(this.name, this.hashCode);
  -
  -  static const SelectorKind GETTER = const SelectorKind('getter', 0);
  -  static const SelectorKind SETTER = const SelectorKind('setter', 1);
  -  static const SelectorKind CALL = const SelectorKind('call', 2);
  -  static const SelectorKind OPERATOR = const SelectorKind('operator', 3);
  -  static const SelectorKind INDEX = const SelectorKind('index', 4);
  +  const SelectorKind(this.name);
  +
  +  static const SelectorKind GETTER = const SelectorKind('getter');
  +  static const SelectorKind SETTER = const SelectorKind('setter');
  +  static const SelectorKind CALL = const SelectorKind('call');
  +  static const SelectorKind OPERATOR = const SelectorKind('operator');
  +  static const SelectorKind INDEX = const SelectorKind('index');
   
     String toString() => name;
   }
  
positive.code:   /** Check whether this is a call to 'assert'. */
    bool isAssert() => isCall() && identical(name.stringValue, "assert");
  
    int get namedArgumentCount => namedArguments.length;
    int get positionalArgumentCount => argumentCount - namedArgumentCount;
  
  
negative.code:   final int argumentCount;
    final List<SourceString> namedArguments;
    final List<SourceString> orderedNamedArguments;
  
    Selector(
        this.kind,
  