Fix #29533

[ghost]

This basically just inlines the fatal! macro from BurntSushi's blog post.

cc @steveklabnik

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. The way Github handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

[steveklabnik]

So, this is good, but why not just panic!? It'd be a little bit simpler, and almost be the same thing.

[ghost]

Sure, avoiding unwinding doesn't seem necessary here, so I'll change this to panic! instead.

[ghost]

@steveklabnik should be okay now

[steveklabnik]

@bors: r+ rollup

[bors]

📌 Commit d9df16b has been approved by steveklabnik

[bors]

⌛ Testing commit d9df16b with merge f18c905...

[steveklabnik]

Great! Thanks so much :)

[ghost]

No problem :-)

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt