19 lines
286 B
Rust
19 lines
286 B
Rust
|
// check-pass
|
||
|
|
|
||
|
|
#![feature(return_position_impl_trait_in_trait)]
|
||
|
|
#![allow(incomplete_features)]
|
||
|
|
|
||
|
|
trait Foo {
|
||
|
|
fn f() -> Box<impl Sized>;
|
||
|
|
}
|
||
|
|
|
||
|
|
impl Foo for () {
|
||
|
|
fn f() -> Box<String> {
|
||
|
|
Box::new(String::new())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
let x: Box<String> = <() as Foo>::f();
|
||
|
|
}
|