blob: 84fcb5e2880a79c017aac5e7bd209f5def992e42 (
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
|
// rust-lang/rust#57979 : the initial support for `impl Trait` didn't
// properly check syntax hidden behind an associated type projection.
// Here we test behavior of occurrences of `impl Trait` within a path
// component in that context.
mod allowed {
#![allow(nested_impl_trait)]
pub trait Bar { }
pub trait Quux<T> { type Assoc; }
pub fn demo(_: impl Quux<(), Assoc=<() as Quux<impl Bar>>::Assoc>) { }
impl<T> Quux<T> for () { type Assoc = u32; }
}
mod warned {
#![warn(nested_impl_trait)]
pub trait Bar { }
pub trait Quux<T> { type Assoc; }
pub fn demo(_: impl Quux<(), Assoc=<() as Quux<impl Bar>>::Assoc>) { }
//~^ WARN `impl Trait` is not allowed in path parameters
//~| WARN will become a hard error in a future release!
impl<T> Quux<T> for () { type Assoc = u32; }
}
mod denied {
#![deny(nested_impl_trait)]
pub trait Bar { }
pub trait Quux<T> { type Assoc; }
pub fn demo(_: impl Quux<(), Assoc=<() as Quux<impl Bar>>::Assoc>) { }
//~^ ERROR `impl Trait` is not allowed in path parameters
//~| WARN will become a hard error in a future release!
impl<T> Quux<T> for () { type Assoc = u32; }
}
fn main() { }
|
