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Check lifetime parameters when we do check for supertrait impls. Fixes …
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src/test/compile-fail/trait-impl-of-supertrait-has-wrong-lifetime-parameters.rs
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// 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. | ||
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// 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>. | ||
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trait T1<'x> { | ||
fn x(&self) -> &'x int; | ||
} | ||
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trait T2<'x, 'y> : T1<'x> { | ||
fn y(&self) -> &'y int; | ||
} | ||
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struct S<'a, 'b> { | ||
a: &'a int, | ||
b: &'b int | ||
} | ||
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impl<'a,'b> T1<'b> for S<'a, 'b> { | ||
fn x(&self) -> &'b int { | ||
self.b | ||
} | ||
} | ||
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impl<'a,'b> T2<'a, 'b> for S<'a, 'b> { //~ ERROR cannot infer an appropriate lifetime | ||
fn y(&self) -> &'b int { | ||
self.b | ||
} | ||
} | ||
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pub fn main() { | ||
} |