https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107417
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Keywords| |accepts-invalid, | |rejects-valid Ever confirmed|0 |1 Last reconfirmed| |2022-10-26 --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- I think the underlying issue is that it accepts the pack without expansion: template<typename... T> requires (requires (T x) { x; }) auto func(T...) { } And so the error about "no unexpanded parameter packs" is correct, the AST doesn't contain any. But it should do, the requires-expression is a pack expression that must be expanded (e.g. in a fold expression).