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// 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() { }
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