[Bug c++/116223] [14/15 Regression] GCC rejects program involving integral conversion in non-type template parameter with auto

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116223

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-14 branch has been updated by Jason Merrill
<ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:b1102f7c478136bfe18ceaf7db9572a8a757a3d2

commit r14-10570-gb1102f7c478136bfe18ceaf7db9572a8a757a3d2
Author: Jason Merrill <ja...@redhat.com>
Date:   Mon Aug 5 11:21:05 2024 -0400

    c++: alias and non-type template parm [PR116223]

    My r14-8291 for PR112632 introduced IMPLICIT_CONV_EXPR_FORCED to express
    conversions to the type of an alias template parameter.  In this example,
    that broke deduction of X in the call to foo, so let's teach deduction to
    look through it.

            PR c++/116223
            PR c++/112632

    gcc/cp/ChangeLog:

            * pt.cc (deducible_expression): Also look through
            IMPLICIT_CONV_EXPR_FORCED.
            (unify): Likewise.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1z/nontype-auto25.C: New test.

    (cherry picked from commit 4add6cd341a779e980e41ed6fb49175fca37496e)