1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
15 pub trait Trait2<X> {}
19 impl<X, T> Trait1<X> for T where T: Trait2<X> {
23 impl<X> Trait1<Box<X>> for A {
24 //~^ ERROR conflicting implementations of trait
26 //~| downstream crates may implement trait `Trait2<std::boxed::Box<_>>` for type `A`