[Bug c++/103769] [11 Regression] checking ICE in hashtab_chk_error with alias template and pack expansion after r11-7931

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103769

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Jason Merrill
<ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:3bf2e1bfc9858516e028137b313e4c689b0c8cd4

commit r11-9707-g3bf2e1bfc9858516e028137b313e4c689b0c8cd4
Author: Jason Merrill <ja...@redhat.com>
Date:   Fri Mar 25 11:26:06 2022 -0400

    c++: ICE with alias in pack expansion [PR103769]

    This was breaking because when we stripped the 't' typedef in s<t<Args>...>
    to be s<Args...>, the TYPE_MAIN_VARIANT of "Args..." was still
    "t<Args>...", because type pack expansions are treated as types.  Fixed by
    using the right function to copy a "type".

            PR c++/99445
            PR c++/103769

    gcc/cp/ChangeLog:

            * tree.c (strip_typedefs): Use build_distinct_type_copy.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/variadic-alias5.C: New test.