[Bug libstdc++/100982] wrong constraint in std::optional::operator=

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100982

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jonathan Wakely
<r...@gcc.gnu.org>:

https://gcc.gnu.org/g:b06478ca4142ca204133351da45691c787314f64

commit r9-9637-gb06478ca4142ca204133351da45691c787314f64
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Wed Jun 9 11:03:15 2021 +0100

    libstdc++: Fix constraint on std::optional assignment [PR 100982]

    libstdc++-v3/ChangeLog:

            PR libstdc++/100982
            * include/std/optional (optional::operator=(const optional<U>&)):
            Fix value category used in is_assignable check.
            * testsuite/20_util/optional/assignment/100982.cc: New test.

    (cherry picked from commit b3fce1bd45f72cc9e55fb7431762e92e30fefcf1)