[Bug c++/98372] [11 Regression] ICE tree check: accessed elt 2 of ‘tree_vec’ with 1 elts in tsubst, at cp/pt.c:15500 since r11-5942-g059da609fa8b3a08

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98372

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Nathan Sidwell <nat...@gcc.gnu.org>:

https://gcc.gnu.org/g:d61d2a5f3ce9238bad7cbd7733d90c6ec7ae5fbc

commit r11-6666-gd61d2a5f3ce9238bad7cbd7733d90c6ec7ae5fbc
Author: Nathan Sidwell <nat...@acm.org>
Date:   Thu Jan 14 05:15:33 2021 -0800

    c++: Fix erroneous parm comparison logic [PR 98372]

    I flubbed an application of De Morgan's law.  Let's just express the
    logic directly and let the compiler figure it out.  This bug made it
    look like pr52830 was fixed, but it is not.

            PR c++/98372
            gcc/cp/
            * tree.c (cp_tree_equal): Correct map_context logic.
            gcc/testsuite/
            * g++.dg/cpp0x/constexpr-52830.C: Restore dg-ice
            * g++.dg/template/pr98372.C: New.