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
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
//@ check-pass
use std::fmt::Debug;
trait Foo {
fn foo(&self) -> impl Debug;
}
impl Foo for () {
fn foo(&self) -> impl Debug {
"Hello, world"
}
}
impl<T: Default + Debug> Foo for std::marker::PhantomData<T> {
fn foo(&self) -> impl Debug {
T::default()
}
}
trait Bar {
fn bar<T>(&self) -> impl Debug;
}
impl Bar for () {
fn bar<T>(&self) -> impl Debug {
format!("Hello with generic {}", std::any::type_name::<T>())
}
}
trait Baz {
fn baz(&self) -> impl Debug + '_;
}
impl Baz for String {
fn baz(&self) -> impl Debug + '_ {
(self,)
}
}
fn main() {
println!("{:?}", ().foo());
println!("{:?}", ().bar::<u64>());
println!("{:?}", "hi".to_string().baz());
}
|
