[Bug c++/116502] [15 Regression] -Wunused-result warning cannot be suppressed if coroutine awaiter returns a reference after r15-2318-g2664c1bf83855b

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116502

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Arsen Arsenovic <ar...@gcc.gnu.org>:

https://gcc.gnu.org/g:05e4f07cad1eacf869c10622cae2a9cdee3b6a7a

commit r15-3921-g05e4f07cad1eacf869c10622cae2a9cdee3b6a7a
Author: Arsen ArsenoviÄ <ar...@aarsen.me>
Date:   Wed Aug 28 21:59:18 2024 +0200

    c++/coro: prevent ICV_STATEMENT diagnostics in temp promotion [PR116502]

    If such a diagnostic is necessary, it has already been emitted,
    otherwise, it is not correct and emitting it here is inactionable by the
    user, and bogus.

            PR c++/116502

    gcc/cp/ChangeLog:

            * coroutines.cc (maybe_promote_temps): Convert temporary
            initializers to void without complaining.

    gcc/testsuite/ChangeLog:

            * g++.dg/coroutines/maybe-unused-1.C: New test.
            * g++.dg/coroutines/pr116502.C: New test.