| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // Check that when we test the supertrait we ensure consistent use of |
| // lifetime parameters. In this case, implementing T2<'a,'b> requires |
| // an impl of T1<'a>, but we have an impl of T1<'b>. |
| |
| trait T1<'x> { |
| fn x(&self) -> &'x isize; |
| } |
| |
| trait T2<'x, 'y> : T1<'x> { |
| fn y(&self) -> &'y isize; |
| } |
| |
| struct S<'a, 'b> { |
| a: &'a isize, |
| b: &'b isize |
| } |
| |
| impl<'a,'b> T1<'b> for S<'a, 'b> { |
| fn x(&self) -> &'b isize { |
| self.b |
| } |
| } |
| |
| impl<'a,'b> T2<'a, 'b> for S<'a, 'b> { //~ ERROR cannot infer an appropriate lifetime |
| fn y(&self) -> &'b isize { |
| self.b |
| } |
| } |
| |
| pub fn main() { |
| } |
