//型
 public override bool Visit(
         UnifiedBasicType element, VisitorArgument arg)
 {
     element.BasicTypeName.TryAccept(this, arg);
     return false;
 }
 public override bool Visit(
     UnifiedBasicType element, VisitorArgument arg)
 {
     element.BasicTypeName.TryAccept(this, arg);
     return(false);
 }