mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-17 19:14:16 +00:00
34 lines
475 B
Rust
34 lines
475 B
Rust
// check-pass
|
|
|
|
fn any<T>() -> T {
|
|
loop {}
|
|
}
|
|
|
|
trait Foo {
|
|
type V;
|
|
}
|
|
|
|
trait Callback<T: Foo>: Fn(&T, &T::V) {}
|
|
impl<T: Foo, F: Fn(&T, &T::V)> Callback<T> for F {}
|
|
|
|
struct Bar<T: Foo> {
|
|
callback: Box<dyn Callback<T>>,
|
|
}
|
|
|
|
impl<T: Foo> Bar<T> {
|
|
fn event(&self) {
|
|
(self.callback)(any(), any());
|
|
}
|
|
}
|
|
|
|
struct A;
|
|
struct B;
|
|
impl Foo for A {
|
|
type V = B;
|
|
}
|
|
|
|
fn main() {
|
|
let foo = Bar::<A> { callback: Box::new(|_: &A, _: &B| ()) };
|
|
foo.event();
|
|
}
|