[Bug c++/97778] return type not deduced with gcc but get deduced with clang

[janezz55 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97778

--- Comment #1 from Janez Zemva <janezz55 at gmail dot com> ---
oh, once, again, -std=c++20