| // rust-lang/rust#57979 : the initial support for `impl Trait` didn't |
| // properly check syntax hidden behind an associated type projection, |
| // but it did catch *some cases*. This is checking that we continue to |
| // properly emit errors for those. |
| // |
| // issue-57979-nested-impl-trait-in-assoc-proj.rs shows the main case |
| // that we were previously failing to catch. |
| |
| struct Deeper<T>(T); |
| |
| pub trait Foo<T> { } |
| pub trait Bar { } |
| pub trait Quux { type Assoc; } |
| pub fn demo(_: impl Quux<Assoc=Deeper<impl Foo<impl Bar>>>) { } |
| //~^ ERROR nested `impl Trait` is not allowed |
| |
| fn main() { } |
