https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116789
--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #7) > The important part is the type alias ali1. Even from the commit message: ``` it occurred to me that the problem is really with alias (and concept) templates ``` So yes that looks like the real fix too.