| // 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. |
| |
| // Test that an impl with only one bound region `'a` cannot be used to |
| // satisfy a constraint where there are two bound regions. |
| |
| trait Foo<X> { |
| fn foo(&self, x: X) { } |
| } |
| |
| fn want_foo2<T>() |
| where T : for<'a,'b> Foo<(&'a isize, &'b isize)> |
| { |
| } |
| |
| fn want_foo1<T>() |
| where T : for<'z> Foo<(&'z isize, &'z isize)> |
| { |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Expressed as a where clause |
| |
| struct SomeStruct; |
| |
| impl<'a> Foo<(&'a isize, &'a isize)> for SomeStruct |
| { |
| } |
| |
| fn a() { want_foo1::<SomeStruct>(); } // OK -- foo wants just one region |
| fn b() { want_foo2::<SomeStruct>(); } //~ ERROR E0277 |
| |
| fn main() { } |