[Bug c++/121055] [15/16 Regression] __is_invocable built-in doesn't match std::invoke for rvalue-ref qualified member function

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121055

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

https://gcc.gnu.org/g:80a51dae8b9af3f6b318f8ed71c67aab96a3fc91

commit r15-10063-g80a51dae8b9af3f6b318f8ed71c67aab96a3fc91
Author: Patrick Palka <ppa...@redhat.com>
Date:   Wed Jul 23 08:31:46 2025 -0400

    c++: fix __is_invocable for std::reference_wrapper [PR121055]

    Our implementation of the INVOKE spec ([func.require]) was incorrectly
    treating reference_wrapper<T>::get() as returning T instead of T&, which
    notably makes a difference when invoking a ref-qualified memfn pointer.

            PR c++/121055

    gcc/cp/ChangeLog:

            * method.cc (build_invoke): Correct reference_wrapper handling.

    gcc/testsuite/ChangeLog:

            * g++.dg/ext/is_invocable5.C: New test.

    Reviewed-by: Jason Merrill <ja...@redhat.com>
    (cherry picked from commit 04a176a1d84a84c630cfd4d232736c12b105957a)