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ea8adc8c | 1 | // Copyright 2017 The Rust Project Developers. See the COPYRIGHT |
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2 | // file at the top-level directory of this distribution and at |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
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. | |
10 | ||
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11 | pub trait Trait1<X> { |
12 | type Output; | |
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13 | } |
14 | ||
ff7c6d11 | 15 | pub trait Trait2<X> {} |
abe05a73 | 16 | |
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17 | pub struct A; |
18 | ||
19 | impl<X, T> Trait1<X> for T where T: Trait2<X> { | |
20 | type Output = (); | |
ea8adc8c | 21 | } |
abe05a73 | 22 | |
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23 | impl<X> Trait1<Box<X>> for A { |
24 | //~^ ERROR conflicting implementations of trait | |
25 | //~| hard error | |
26 | //~| downstream crates may implement trait `Trait2<std::boxed::Box<_>>` for type `A` | |
27 | type Output = i32; | |
223e47cc | 28 | } |
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29 | |
30 | fn main() {} |