https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105565
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> --- (In reply to Patrick Palka from comment #3) > Seems we're hitting a stack overflow due to the excessive recursion, same > with Clang. Not sure if we can realistically do much about that.. Not sure, either. But it looks like r278775 exacerbated the problem somehow, the test reliably fails/compiles after/before that revision. I wonder why, it's a concepts patch.