mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 06:51:58 +00:00
28 lines
360 B
Rust
28 lines
360 B
Rust
// check-pass
|
|
|
|
struct D;
|
|
|
|
trait Tr {
|
|
type It;
|
|
fn foo(self) -> Option<Self::It>;
|
|
}
|
|
|
|
impl<'a> Tr for &'a D {
|
|
type It = ();
|
|
fn foo(self) -> Option<()> { None }
|
|
}
|
|
|
|
fn run<F>(f: F)
|
|
where for<'a> &'a D: Tr,
|
|
F: Fn(<&D as Tr>::It),
|
|
{
|
|
let d = &D;
|
|
while let Some(i) = d.foo() {
|
|
f(i);
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
run(|_| {});
|
|
}
|