https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94645
--- Comment #10 from Patrick Palka <ppalka at gcc dot gnu.org> --- Oops, it turns out the ICEs I was seeing in the cmcstl2 testsuite with the change in #c9 were actually due to PR94719, which has since been fixed. The cmcstl2 testsuite now compiles fine with or without the change in #c9 FWIW.