| // 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) { } |
| fn chip_paint(&self, c: Self::Color) { } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| 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 dent<C:Car>(c: C, color: C::Color) { c.chip_paint(color) } |
| fn a() { dent(ModelT, Black); } |
| fn b() { dent(ModelT, Blue); } //~ ERROR mismatched types |
| fn c() { dent(ModelU, Black); } //~ ERROR mismatched types |
| fn d() { dent(ModelU, Blue); } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| fn e() { ModelT.chip_paint(Black); } |
| fn f() { ModelT.chip_paint(Blue); } //~ ERROR mismatched types |
| fn g() { ModelU.chip_paint(Black); } //~ ERROR mismatched types |
| fn h() { ModelU.chip_paint(Blue); } |
| |
| pub fn main() { } |
