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1 | // Copyright 2014 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. | |
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 | ||
11 | // Test that an impl with only one bound region `'a` cannot be used to | |
12 | // satisfy a constraint where there are two bound regions. | |
13 | ||
14 | trait Foo<X> { | |
15 | fn foo(&self, x: X) { } | |
16 | } | |
17 | ||
18 | fn want_foo2<T>() | |
19 | where T : for<'a,'b> Foo<(&'a isize, &'b isize)> | |
20 | { | |
21 | } | |
22 | ||
23 | fn want_foo1<T>() | |
24 | where T : for<'z> Foo<(&'z isize, &'z isize)> | |
25 | { | |
26 | } | |
27 | ||
28 | /////////////////////////////////////////////////////////////////////////// | |
29 | // Expressed as a where clause | |
30 | ||
31 | struct SomeStruct; | |
32 | ||
33 | impl<'a> Foo<(&'a isize, &'a isize)> for SomeStruct | |
34 | { | |
35 | } | |
36 | ||
37 | fn a() { want_foo1::<SomeStruct>(); } // OK -- foo wants just one region | |
54a0048b | 38 | fn b() { want_foo2::<SomeStruct>(); } //~ ERROR E0277 |
1a4d82fc JJ |
39 | |
40 | fn main() { } |