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pub trait Trait1<X> {
type Output;
}
pub trait Trait2<X> {}
pub struct A;
impl<X, T> Trait1<X> for T where T: Trait2<X> {
type Output = ();
}
impl<X> Trait1<Box<X>> for A {
//~^ ERROR conflicting implementations of trait
//~| hard error
//~| downstream crates may implement trait `Trait2<std::boxed::Box<_>>` for type `A`
type Output = i32;
}
fn main() {}
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