src/test/ui/type-alias-impl-trait/generic_underconstrained2.rs

   1 #![feature(type_alias_impl_trait)]
   2
   3 fn main() {}
   4
   5 type Underconstrained<T: std::fmt::Debug> = impl 'static;
   6 //~^ ERROR: at least one trait must be specified
   7
   8 // not a defining use, because it doesn't define *all* possible generics
   9 fn underconstrained<U>(_: U) -> Underconstrained<U> {
  10     //~^ ERROR `U` doesn't implement `Debug`
  11     5u32
  12 }
  13
  14 type Underconstrained2<T: std::fmt::Debug> = impl 'static;
  15 //~^ ERROR: at least one trait must be specified
  16
  17 // not a defining use, because it doesn't define *all* possible generics
  18 fn underconstrained2<U, V>(_: U, _: V) -> Underconstrained2<V> {
  19     //~^ ERROR `V` doesn't implement `Debug`
  20     5u32
  21 }