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Subject: [Bug c++/103852] [10/11/12 Regression] Alias template argument
 deduction is available in C++17 mode
Date: Mon, 04 Apr 2022 14:44:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103852

--- 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:a11f204e5a30d1dfd2508e3f3014509a0342f604

commit r12-7984-ga11f204e5a30d1dfd2508e3f3014509a0342f604
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Apr 1 15:55:21 2022 -0400

    c++: alias-tmpl equivalence and default targs [PR103852]

    The suggested resolution for CWG1286, which we implemented, ignores def=
ault
    template arguments, but this PR is an example of why that doesn't make
    sense: the templates aren't functionally equivalent.

            PR c++/103852
            DR 1286

    gcc/cp/ChangeLog:

            * pt.cc (get_underlying_template): Compare default template arg=
s.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/alias-decl-dr1286a.C: Default args now matter.
            * g++.dg/cpp1z/class-deduction-alias1.C: New test.=