anchor.diff:      ;
   
   classBody
  -    :   l='{' 
  +    :       {
  +                self._anon_stack.append(1)
  +            }
  +        l='{' 
               {
                   self.object_scopes.append([])
               }
       classBodyDeclaration* r='}'
               {
  +                self._anon_stack.pop()
                   self.addBlock(min(self.modifier_line, $l.getLine()), $r.getLine(), $l.getLine())
                   }
       ;
  
positive.code:     ;
  
  classCreatorRest
      :   arguments
          (  {    self.scopes.append(('class','anon'))    }
          classBody)?
      ;
  
  
negative.code: }
  //NAK
  @init {
      self._anon_stack = []
      self.scopes = []
      self.object_scopes = [[]]
      self.formals = []
  