[Bug libstdc++/104098] [11/12 Regression] bits/stl_iterator.h fails to compile for __cplusplus > 201703L and with __cpp_concepts undefined

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104098

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

https://gcc.gnu.org/g:e13e95bd274148a825bc9527efac49e99080dd64

commit r12-6692-ge13e95bd274148a825bc9527efac49e99080dd64
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Jan 18 15:34:24 2022 +0000

    libstdc++: Use __cpp_lib_concepts in std::reverse_iterator [PR104098]

    We should not assume that std::iter_value_t etc. are defined
    unconditionally for C++20 mode.

    libstdc++-v3/ChangeLog:

            PR libstdc++/104098
            * include/bits/stl_iterator.h (reverse_iterator): Check
            __cpp_lib_concepts instead of __cplusplus.