[Bug c++/100372] [11/12 Regression] ICE with variadic template template, internal compiler error: in strip_typedefs, at cp/tree.c:1544

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100372

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:061fe8c58ac4d436906a404f7fb46b0a6e0d7b4f

commit r12-894-g061fe8c58ac4d436906a404f7fb46b0a6e0d7b4f
Author: Jason Merrill <ja...@redhat.com>
Date:   Tue May 18 17:12:37 2021 -0400

    c++: template template parm pack expansion [PR100372]

    Here we have a pack expansion of a template template parameter pack, of
    which the pattern is a TEMPLATE_DECL, which strip_typedefs doesn't want to
    see.

            PR c++/100372

    gcc/cp/ChangeLog:

            * tree.c (strip_typedefs): Only look at the pattern of a
            TYPE_PACK_EXPANSION if it's a type.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/alias-decl-ttp1.C: New test.