| // 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 equality constraints on associated types. Check we get type errors |
| // where we should. |
| |
| pub trait Foo { |
| type A; |
| fn boo(&self) -> <Self as Foo>::A; |
| } |
| |
| struct Bar; |
| |
| impl Foo for isize { |
| type A = usize; |
| fn boo(&self) -> usize { |
| 42 |
| } |
| } |
| |
| fn foo1<I: Foo<A=Bar>>(x: I) { |
| let _: Bar = x.boo(); |
| } |
| |
| fn foo2<I: Foo>(x: I) { |
| let _: Bar = x.boo(); |
| //~^ ERROR mismatched types |
| //~| expected type `Bar` |
| //~| found type `<I as Foo>::A` |
| //~| expected struct `Bar`, found associated type |
| } |
| |
| |
| pub fn baz(x: &Foo<A=Bar>) { |
| let _: Bar = x.boo(); |
| } |
| |
| |
| pub fn main() { |
| let a = 42; |
| foo1(a); |
| //~^ ERROR type mismatch resolving |
| //~| expected usize, found struct `Bar` |
| baz(&a); |
| //~^ ERROR type mismatch resolving |
| //~| expected usize, found struct `Bar` |
| } |