[Bug c++/95516] [coroutines] incorrect warning "'coro.gro' is used uninitialized"

[bruck.michael at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95516

--- Comment #2 from Michael Bruck <bruck.michael at gmail dot com> ---
I was using -Ofast -Wall:
https://gcc.godbolt.org/z/pAkVS8