More informative error messages for sim_macro

[Deophius]

In the current implementation, the proc macro that handles HCL code seems to depend on unwrap() too much. Can we use expect() to provide more descriptive error messages and include the line number?

[sshwy]

其实在发了 archlab 之后我已经改了很多 unwrap 的部分，你可以重新 pull 一下仓库看看现在的 error message