[Bug c++/116441] [[nodiscard]] attribute ignored in some cases

[leonid.satanovsky at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116441

--- Comment #5 from Leonid Satanovsky <leonid.satanovsky at gmail dot com> ---
N.B.:

#include <iostream> is for sure not needed for reproduction (just a leftover
from earlier experiments)