[Bug rust/108111] Rust meets clang

[dkm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108111

--- Comment #1 from Marc Poulhiès <dkm at gcc dot gnu.org> ---
Hello David,

Looking at the errors, most of them are trivial to fix.

1-6: missing 'override'.
9: not present in most recent dev branch on github, can be ignored as it will
disappear when we update the gcc master branch with latest code.
13-14: class is missing a virtual dtor
7,10-12: unused variables

I'll need to read a bit more about the 8 (default move assignment op being
deleted).

I've a first patch that addresses most of the warnings, but I'm missing the
last one. If Arthur (or someone else) doesn't beat me to it, I'll have a fix
shortly