https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120159
--- Comment #2 from Alberto <alberto.gcc.bugzilla at gmail dot com> --- Thank you very much for the quick fix! Note to self: there are no is_corresponding_member_v and is_pointer_interconvertible_with_class_v (those are functions, not traits structs, and possibly the reason of the oversight).