| // { dg-do compile { target c++17_only } } | |
| // { dg-options "-fconcepts" } | |
| template <class...> class tuple {}; | |
| tuple<int> t; | |
| tuple<auto> y = t; | |
| tuple<int,double> t2; | |
| tuple<auto...> x = t2; | |
| tuple<auto...> x2 = t; | |
| tuple<auto> y2 = t2; // { dg-error "" } |