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Subject: [Bug c++/101883] class template argument deduction in non-type
 template parameter allows explicit deduction guide
Date: Wed, 06 Oct 2021 14:15:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101883

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:52dd840c5eba25ef54dee3f1c78f371032a7c051

commit r11-9078-g52dd840c5eba25ef54dee3f1c78f371032a7c051
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed Aug 18 08:37:42 2021 -0400

    c++: ignore explicit dguides during NTTP CTAD [PR101883]

    Since (template) argument passing is a copy-initialization context,
    we mustn't consider explicit deduction guides when deducing a CTAD
    placeholder type of an NTTP.

            PR c++/101883

    gcc/cp/ChangeLog:

            * pt.c (convert_template_argument): Pass LOOKUP_IMPLICIT to
            do_auto_deduction.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/nontype-class49.C: New test.

    (cherry picked from commit a6b3db3e8625a3cba1240f0b5e1a29bd6c68b8ca)=