Try-Except 执行扩展时
是否可以编写一个函数来执行以下操作: function \tryexpand (\foo): try: expand(\foo) except (Argument of \@following has an extra }): store "\relax" in `\result` else: store expansion of `\foo` in `\result` return \result 上下文:我正在尝试做\edef\result{\expanda...