| 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() {} |