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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.
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.
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 auto impl only applies if there are no existing
14 // impls whose types unify.
16 #![feature(optin_builtin_traits)]
18 auto trait Defaulted { }
19 impl<'a
,T
:Signed
> Defaulted
for &'a T { }
20 impl<'a
,T
:Signed
> Defaulted
for &'a
mut T { }
21 fn is_defaulted
<T
:Defaulted
>() { }
24 impl Signed
for i32 { }
27 is_defaulted
::<&'
static i32>();
28 is_defaulted
::<&'
static u32>();
29 //~^ ERROR `u32: Signed` is not satisfied