| trait Trait { | |
| type Output; | |
| } | |
| impl Trait for () { | |
| type Output = i32; | |
| } | |
| struct Struct<F>(F); | |
| impl<F> Struct<F> { | |
| pub fn new(_: F) -> Self { | |
| todo!() | |
| } | |
| } | |
| fn main() { | |
| let _do_not_waste: Struct<impl Trait<Output = i32>> = Struct::new(()); | |
| //~^ `impl Trait` only allowed in function and inherent method argument and return types | |
| } |