| // Tests that we consider `Box<U>: !Sugar` to be ambiguous, even | |
| // though we see no impl of `Sugar` for `Box`. Therefore, an overlap | |
| // error is reported for the following pair of impls (#23516). | |
| pub trait Sugar { fn dummy(&self) { } } | |
| pub trait Sweet { fn dummy(&self) { } } | |
| impl<T:Sugar> Sweet for T { } | |
| impl<U:Sugar> Sweet for Box<U> { } | |
| //~^ ERROR E0119 | |
| fn main() { } |