| // 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, even with the new |
| // future-incompatibility warnings. |
| // |
| // issue-57979-nested-impl-trait-in-assoc-proj.rs shows the main case |
| // that we were previously failing to catch. |
| |
| struct Deeper<T>(T); |
| |
| mod allowed { |
| #![allow(nested_impl_trait)] |
| |
| pub trait Foo<T> { } |
| pub trait Bar { } |
| pub trait Quux { type Assoc; } |
| pub fn demo(_: impl Quux<Assoc=super::Deeper<impl Foo<impl Bar>>>) { } |
| //~^ ERROR nested `impl Trait` is not allowed |
| } |
| |
| mod warned { |
| #![warn(nested_impl_trait)] |
| |
| pub trait Foo<T> { } |
| pub trait Bar { } |
| pub trait Quux { type Assoc; } |
| pub fn demo(_: impl Quux<Assoc=super::Deeper<impl Foo<impl Bar>>>) { } |
| //~^ ERROR nested `impl Trait` is not allowed |
| } |
| |
| mod denied { |
| #![deny(nested_impl_trait)] |
| |
| pub trait Foo<T> { } |
| pub trait Bar { } |
| pub trait Quux { type Assoc; } |
| pub fn demo(_: impl Quux<Assoc=super::Deeper<impl Foo<impl Bar>>>) { } |
| //~^ ERROR nested `impl Trait` is not allowed |
| } |
| |
| fn main() { } |
