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92a42be0 | 1 | // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
223e47cc LB |
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 | ||
92a42be0 SL |
11 | // Coherence error results because we do not know whether `T: Foo<P>` or not |
12 | // for the second impl. | |
c34b1796 | 13 | |
92a42be0 | 14 | use std::marker::PhantomData; |
223e47cc | 15 | |
92a42be0 SL |
16 | pub trait Foo<P> {} |
17 | ||
54a0048b | 18 | impl <P, T: Foo<P>> Foo<P> for Option<T> {} |
92a42be0 | 19 | |
54a0048b | 20 | impl<T, U> Foo<T> for Option<U> { } //~ ERROR E0119 |
c34b1796 | 21 | |
223e47cc | 22 | fn main() {} |