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
|
//@ run-pass
#![allow(unused_variables)]
#![allow(unused_imports)]
// Test that we don't trigger on the blanket impl for all `&'a T` but
// rather keep autoderefing and trigger on the underlying impl. To
// know not to stop at the blanket, we have to recursively evaluate
// the `T:Foo` bound.
use std::marker::Sized;
// Note: this must be generic for the problem to show up
trait Foo<A> { //~ WARN trait `Foo` is never used
fn foo(&self, a: A);
}
impl Foo<u8> for [u8] {
fn foo(&self, a: u8) {}
}
impl<'a, A, T> Foo<A> for &'a T where T: Foo<A> {
fn foo(&self, a: A) {
Foo::foo(*self, a)
}
}
trait Bar {
fn foo(&self);
}
struct MyType;
impl Bar for MyType {
fn foo(&self) {}
}
fn main() {
let mut m = MyType;
(&mut m).foo()
}
|
