https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95263
--- Comment #2 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:ac9face8d26ea4b6aa72902ecc22e89ef00763c5 commit r11-661-gac9face8d26ea4b6aa72902ecc22e89ef00763c5 Author: Nathan Sidwell <nat...@acm.org> Date: Wed May 27 09:50:15 2020 -0400 c++: Revert alias template change [pr95263] Turns out templates are more complicated than you think, even when you know they are more complicated than you think. Reverting this change. PR c++/95263 * pt.c (lookup_template_class_1): Restore alias template mutation.