| // Test that impls for these two types are considered ovelapping: |
| // |
| // * `for<'r> fn(fn(&'r u32))` |
| // * `fn(fn(&'a u32)` where `'a` is free |
| // |
| // This is because, for `'a = 'static`, the two types overlap. |
| // Effectively for them to be equal to you get: |
| // |
| // * `for<'r> fn(fn(&'r u32)) <: fn(fn(&'static u32))` |
| // * true if `exists<'r> { 'r: 'static }` (obviously true) |
| // * `fn(fn(&'static u32)) <: for<'r> fn(fn(&'r u32))` |
| // * true if `forall<'r> { 'static: 'r }` (also true) |
| |
| trait Trait {} |
| |
| impl Trait for for<'r> fn(fn(&'r ())) {} |
| impl<'a> Trait for fn(fn(&'a ())) {} |
| //~^ ERROR conflicting implementations |
| // |
| // Note in particular that we do NOT get a future-compatibility warning |
| // here. This is because the new leak-check proposed in [MCP 295] does not |
| // "error" when these two types are equated. |
| // |
| // [MCP 295]: https://github.com/rust-lang/compiler-team/issues/295 |
| |
| fn main() {} |
