[Bug libstdc++/103853] std::forward_list::merge should check if __list != this

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103853

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Jonathan Wakely
<r...@gcc.gnu.org>:

https://gcc.gnu.org/g:2089886d5743c20ce0b41d68f0a4cbe097b46704

commit r11-9909-g2089886d5743c20ce0b41d68f0a4cbe097b46704
Author: Pavel I. Kryukov <pavel.kryu...@phystech.edu>
Date:   Thu Jan 6 12:32:36 2022 +0000

    libstdc++: Add self-merge check to std::forward_list::merge [PR103853]

    This implements the proposed resolution of LWG 3088, so that x.merge(x)
    is a no-op, consistent with std::list::merge.

    Signed-off-by: Pavel I. Kryukov <pavel.kryu...@phystech.edu>

    Co-authored-by: Jonathan Wakely <jwak...@redhat.com>

    libstdc++-v3/ChangeLog:

            PR libstdc++/103853
            * include/bits/forward_list.tcc (forward_list::merge): Check for
            self-merge.
            * testsuite/23_containers/forward_list/operations/merge.cc: New
test.

    (cherry picked from commit 52ebc2be0990d6d3a46bb716164f9cef6f661021)