https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101099
--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> --- (In reply to Martin Liška from comment #6) > Well, it's fixed since r13-3639-ga4cd2389276a30c3 which is a revision that > handles default options. Is it really fixed? Ah, that commit explains that this is not fixed then; the ICE still happens with -fconcepts-ts. Low prio, but still a bug. Thanks for the bisect.