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1 | // Copyright 2015 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 declaring that `&T` is `Defaulted` if `T:Signed` implies | |
12 | // that other `&T` is NOT `Defaulted` if `T:Signed` does not hold. In | |
13 | // other words, the `..` impl only applies if there are no existing | |
14 | // impls whose types unify. | |
15 | ||
16 | #![feature(optin_builtin_traits)] | |
17 | ||
9346a6ac | 18 | trait Defaulted { } |
c34b1796 AL |
19 | impl Defaulted for .. { } |
20 | impl<'a,T:Signed> Defaulted for &'a T { } | |
21 | impl<'a,T:Signed> Defaulted for &'a mut T { } | |
22 | fn is_defaulted<T:Defaulted>() { } | |
23 | ||
9346a6ac | 24 | trait Signed { } |
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25 | impl Signed for i32 { } |
26 | ||
27 | fn main() { | |
28 | is_defaulted::<&'static i32>(); | |
29 | is_defaulted::<&'static u32>(); | |
54a0048b | 30 | //~^ ERROR `u32: Signed` is not satisfied |
c34b1796 | 31 | } |