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associated-type-projection-from-multiple-supertraits.rs
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associated-type-projection-from-multiple-supertraits.rs
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// 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;
//~^ NOTE ambiguous `Color` from `Vehicle`
//~| NOTE ambiguous `Color` from `Vehicle`
//~| NOTE ambiguous `Color` from `Vehicle`
fn go(&self) { }
}
pub trait Box {
type Color;
//~^ NOTE ambiguous `Color` from `Box`
//~| NOTE ambiguous `Color` from `Box`
//~| NOTE ambiguous `Color` from `Box`
//
fn mail(&self) { }
}
pub trait BoxCar : Box + Vehicle {
}
fn dent<C:BoxCar>(c: C, color: C::Color) {
//~^ ERROR ambiguous associated type `Color` in bounds of `C`
//~| NOTE ambiguous associated type `Color`
}
fn dent_object<COLOR>(c: BoxCar<Color=COLOR>) {
//~^ ERROR ambiguous associated type
//~| ERROR the value of the associated type `Color` (from the trait `Vehicle`) must be specified
//~| NOTE ambiguous associated type `Color`
//~| NOTE missing associated type `Color` value
}
fn paint<C:BoxCar>(c: C, d: C::Color) {
//~^ ERROR ambiguous associated type `Color` in bounds of `C`
//~| NOTE ambiguous associated type `Color`
}
pub fn main() { }