[Bug c++/123975] [15/16 Regression] Crash when await_suspend takes an r-value (&&) argument

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123975

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-15 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:

https://gcc.gnu.org/g:95fb3cdf169b49393e386a2b9042803d944dfe8e

commit r15-11086-g95fb3cdf169b49393e386a2b9042803d944dfe8e
Author: Jason Merrill <jason@redhat.com>
Date:   Tue Apr 14 19:19:37 2026 -0400

    c++: unusual await_suspend parameters [PR123975]

    expand_one_await_expression was assuming we could replace the last argument
    of await_suspend with a call to handle::from_address.  This is wrong if
    either the handle parameter has a different type (123975) or await_suspend
    has additional parameters (121643).

            PR c++/121643
            PR c++/123975

    gcc/cp/ChangeLog:

            * coroutines.cc (build_co_await): Pass rvalue to await_suspend.
            (expand_one_await_expression): Fix await_suspend surgery.

    gcc/testsuite/ChangeLog:

            * g++.dg/coroutines/pr121643.C: New test.
            * g++.dg/coroutines/pr123975.C: New test.

    (cherry picked from commit 3bf1ba4c723b8fd6274fb134890c83031d00d408)