[Bug c++/64171] Hang whilst printing error message on invalid code

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64171

--- Comment #3 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
(In reply to Paolo Carlini from comment #2)
> Today I can't reproduce the issue in mainline. Ville, can you double check?

Works fine for me on current trunk, no ICE, no hang.