| // PR c++/90764 | |
| // { dg-do compile { target c++17 } } | |
| namespace a { | |
| struct b; | |
| template <typename...> using c = b; | |
| } | |
| template <typename... d> struct e : a::c<d...> { // { dg-error "incomplete" } | |
| using a::c<>::c; // { dg-prune-output "not a direct base" } | |
| }; | |
| template <template <typename> typename f> void g() { f(); } | |
| void h() { g<e>(); } |