blob: 3329592478d6fa9d884f6f10f3c13941d36cba56 (
plain)
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
46
47
48
|
// edition:2018
// See issue 60414
// Reduction to `impl Trait`
struct Foo<T>(T);
trait FooLike {
type Output;
}
impl<T> FooLike for Foo<T> {
type Output = T;
}
mod impl_trait {
use super::*;
trait Trait {
type Assoc;
}
/// `T::Assoc` can't be normalized any further here.
fn foo_fail<T: Trait>() -> impl FooLike<Output = T::Assoc> {
//~^ ERROR: type mismatch
Foo(())
}
}
// Same with lifetimes in the trait
mod lifetimes {
use super::*;
trait Trait<'a> {
type Assoc;
}
/// Missing bound constraining `Assoc`, `T::Assoc` can't be normalized further.
fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output = T::Assoc> {
//~^ ERROR `impl Trait` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
//~| ERROR: type mismatch
Foo(())
}
}
fn main() {}
|
