| // 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 a where clause attached to a method allows us to add |
| // additional constraints to a parameter out of scope. |
| |
| struct Foo<T> { |
| value: T |
| } |
| |
| struct Bar; // does not implement Eq |
| |
| impl<T> Foo<T> { |
| fn equals(&self, u: &Foo<T>) -> bool where T : Eq { |
| self.value == u.value |
| } |
| } |
| |
| fn main() { |
| let x = Foo { value: Bar }; |
| x.equals(&x); |
| //~^ ERROR the trait `core::cmp::Eq` is not implemented for the type `Bar` |
| } |
