https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118240
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Seems that the ICE started with r11-2748-gb871301f09be70: commit b871301f09be7061904dc87880919d30e6afef8f Author: Jason Merrill <ja...@redhat.com> Date: Fri Aug 14 18:01:27 2020 -0400 c++: Rewrite members for all deduction guides. [PR96199]