Opening this failed log shows a somewhat confusing error message:

It very much looks like this toolstate error is what makes the build fail. That's wrong though, there is another error hiding inside "Building compiler artifacts", and that is the true error.

Is there a way we can avoid showing errors that are entirely unrelated to the actual problem? Also, is there a way we can avoid hiding the compiler error? AFAIK github doesn't fold a group if the endgroup is missing, so ideally we'd not emit endgroup if there was an error that aborts the build.

Cc @rust-lang/bootstrap