1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
//@ check-pass
// Checks that we can infer a closure signature even if the `FnOnce` bound is
// a supertrait of the obligations we have currently registered for the Ty var.
pub trait Receive<T, E>: FnOnce(Result<T, E>) {
fn receive(self, res: Result<T, E>);
}
impl<T, E, F: FnOnce(Result<T, E>)> Receive<T, E> for F {
fn receive(self, res: Result<T, E>) {
self(res)
}
}
pub trait Async<T, E> {
fn receive<F: Receive<T, E>>(self, f: F);
}
impl<T, E> Async<T, E> for Result<T, E> {
fn receive<F: Receive<T, E>>(self, f: F) {
f(self)
}
}
pub fn main() {
Ok::<u32, ()>(123).receive(|res| {
res.unwrap();
});
}
|
