[Bug c++/111703] [11/12/13/14 Regression] [C++20]Compiler fails when using generic lambda in specific situation since r11-550-gf65a3299a521a4

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111703

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>:

https://gcc.gnu.org/g:0077c0fb19981c108a01cd15af9b2d6d478c183b

commit r14-5531-g0077c0fb19981c108a01cd15af9b2d6d478c183b
Author: Patrick Palka <ppa...@redhat.com>
Date:   Thu Nov 16 09:32:07 2023 -0500

    c++: constantness of call to function pointer [PR111703]

    potential_constant_expression for CALL_EXPR tests FUNCTION_POINTER_TYPE_P
    on the callee rather than on the type of the callee, which means we
    always pass want_rval=any when recursing and so may fail to identify a
    non-constant function pointer callee as such.  Fixing this turns out to
    further work around PR111703.

            PR c++/111703
            PR c++/107939

    gcc/cp/ChangeLog:

            * constexpr.cc (potential_constant_expression_1) <case CALL_EXPR>:
            Fix FUNCTION_POINTER_TYPE_P test.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/concepts-fn8.C: Extend test.
            * g++.dg/diagnostic/constexpr4.C: New test.