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
|
// issue: #112841
#![feature(type_alias_impl_trait)]
trait Trait<'a, 'b> {}
impl<T> Trait<'_, '_> for T {}
mod mod1 {
type Opaque<'a, 'b> = impl super::Trait<'a, 'b>;
fn test<'a>() -> Opaque<'a, 'a> {}
//~^ ERROR non-defining opaque type use in defining scope
//~| ERROR non-defining opaque type use in defining scope
}
mod mod2 {
type Opaque<'a, 'b> = impl super::Trait<'a, 'b>;
fn test<'a: 'b, 'b: 'a>() -> Opaque<'a, 'b> {}
//~^ ERROR non-defining opaque type use in defining scope
}
mod mod3 {
type Opaque<'a, 'b> = impl super::Trait<'a, 'b>;
fn test<'a: 'b, 'b: 'a>(a: &'a str) -> Opaque<'a, 'b> { a }
//~^ ERROR non-defining opaque type use in defining scope
}
// This is similar to the previous cases in that 'a is equal to 'static,
// which is some sense an implicit parameter to `Opaque`.
// For example, given a defining use `Opaque<'a> := &'a ()`,
// it is ambiguous whether `Opaque<'a> := &'a ()` or `Opaque<'a> := &'static ()`
mod mod4 {
type Opaque<'a> = impl super::Trait<'a, 'a>;
fn test<'a: 'static>() -> Opaque<'a> {}
//~^ ERROR expected generic lifetime parameter, found `'static`
}
fn main() {}
|
