anchor.diff:          }
         }
         classElement = includeSuperMembers ? classElement.superclass : null;
  -    } while(classElement !== null);    
  +    } while(classElement !== null);
     }
   
     /**
  
positive.code:   void forEachInstanceField([void f(ClassElement enclosingClass, Element field),
                               includeBackendMembers = false,
                               includeSuperMembers = false]) {
      // Filters so that [f] is only invoked with instance fields. 
      void fieldFilter(ClassElement enclosingClass, Element member) {
        if (member.isInstanceMember() && member.kind == ElementKind.FIELD) {
          f(enclosingClass, member);
  
negative.code:   Token position() => null;
  
    Token findMyName(Token token) {
      for (Token t = token; t.kind !== EOF_TOKEN; t = t.next) {
        if (t.value == name) return t;
      }
      return token;
  