anchor.diff:  }
   //NAK
   @init {
  +    self._anon_stack = []
       self.scopes = []
       self.object_scopes = [[]]
       self.formals = []
  
positive.code:     ;
  
  classCreatorRest
      :   arguments
          (  {    self.scopes.append(('class','anon'))    }
          classBody)?
      ;
  
  
negative.code:     ;
  
  classBody
      :       {
                  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())
                  }
      ;
  