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Subject: [Bug c++/98810] [9/10/11 Regression] [C++20] ICE in tsubst_copy, at
 cp/pt.c:16771
Date: Fri, 26 Feb 2021 03:57:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98810

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:7c657339d6a4a671b4cd8bc62ba4e0df6bfc7c72

commit r11-7416-g7c657339d6a4a671b4cd8bc62ba4e0df6bfc7c72
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Feb 25 16:47:53 2021 -0500

    c++: Fix class NTTP constness handling [PR98810]

    Here, when substituting still-dependent args into an alias template, we=
 see
    a non-const type because the default argument is non-const, and is not a
    template parm object because it's still dependent.

    gcc/cp/ChangeLog:

            PR c++/98810
            * pt.c (tsubst_copy) [VIEW_CONVERT_EXPR]: Add const
            to a class non-type template argument that needs it.

    gcc/testsuite/ChangeLog:

            PR c++/98810
            * g++.dg/cpp2a/nontype-class-defarg1.C: New test.=