Comment # 17 on bug 1192067 from Alberto Planas Dominguez

(In reply to Hans-Peter Jansen from comment #16)

> If it's, after all, "just" an "impedance mismatch" between llvm 13 and rust
> 1.55, something in the interface logic between them is broken, and the
> lesson learned from this should be at least: build rust only with the llvm,
> that upstream uses.

I made this suggestion in the PR that fixed the issue, but they make me to
understand that:

1. llvm is very slow to compile, so when compiling rustc / cargo is good to use
the llvm from the system to gain some speed.

2. rustc is expected to work with some range of llvm versions

I think that they are fair points, and TW can help in detecting early issues.

But still I think that there should be an outcome of this bug, like working on
enabling the tests inside the %check section on the rust package.