| // 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 in a where clause where the type being |
| // equated appears in a supertrait. |
| |
| pub trait Vehicle { |
| type Color; |
| |
| fn go(&self) { } |
| } |
| |
| pub trait Car : Vehicle { |
| fn honk(&self) { } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| struct Black; |
| struct ModelT; |
| impl Vehicle for ModelT { type Color = Black; } |
| impl Car for ModelT { } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| struct Blue; |
| struct ModelU; |
| impl Vehicle for ModelU { type Color = Blue; } |
| impl Car for ModelU { } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| fn black_car<C:Car<Color=Black>>(c: C) { |
| } |
| |
| fn blue_car<C:Car<Color=Blue>>(c: C) { |
| } |
| |
| fn a() { black_car(ModelT); } |
| fn b() { blue_car(ModelT); } //~ ERROR type mismatch |
| fn c() { black_car(ModelU); } //~ ERROR type mismatch |
| fn d() { blue_car(ModelU); } |
| |
| pub fn main() { } |
