| // Copyright 2015 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. |
| |
| // Test that declaring that `&T` is `Defaulted` if `T:Signed` implies |
| // that other `&T` is NOT `Defaulted` if `T:Signed` does not hold. In |
| // other words, the `..` impl only applies if there are no existing |
| // impls whose types unify. |
| |
| #![feature(optin_builtin_traits)] |
| |
| trait Defaulted { } |
| impl Defaulted for .. { } |
| impl<'a,T:Signed> Defaulted for &'a T { } |
| impl<'a,T:Signed> Defaulted for &'a mut T { } |
| fn is_defaulted<T:Defaulted>() { } |
| |
| trait Signed { } |
| impl Signed for i32 { } |
| |
| fn main() { |
| is_defaulted::<&'static i32>(); |
| is_defaulted::<&'static u32>(); |
| //~^ ERROR the trait `Signed` is not implemented for the type `u32` |
| } |
