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Subject: [Bug c++/96199] [10/11 Regression] internal compiler error: in
 tsubst_copy with CTAD for alias templates
Date: Thu, 08 Oct 2020 20:54:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96199

--- Comment #8 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:1c56c143b2011080d8a4516f37f78f647b0ee258

commit r11-3738-g1c56c143b2011080d8a4516f37f78f647b0ee258
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Oct 8 15:43:26 2020 -0400

    c++: Fix member alias template in C++17 and up. [PR96805]

    Here we're trying to push into a<T>::c<N> in order to instantiate t<N>,=
 but
    were building a TYPENAME_TYPE for it because a<T> isn't open yet.  Don't
    do that when we know we're trying to enter the scope.

    gcc/cp/ChangeLog:

            PR c++/96805
            PR c++/96199
            * pt.c (tsubst_aggr_type): Don't build a TYPENAME_TYPE when
            entering_scope.
            (tsubst_template_decl): Use tsubst_aggr_type.

    gcc/testsuite/ChangeLog:

            PR c++/96805
            * g++.dg/cpp0x/alias-decl-pr96805.C: New test.=