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