mirror of https://github.com/rust-lang/rust
44 lines
990 B
Rust
44 lines
990 B
Rust
// 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 Box {
|
|
type Color;
|
|
//
|
|
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`
|
|
}
|
|
|
|
fn dent_object<COLOR>(c: &dyn BoxCar<Color=COLOR>) {
|
|
//~^ ERROR ambiguous associated type
|
|
//~| ERROR the value of the associated types
|
|
}
|
|
|
|
fn paint<C:BoxCar>(c: C, d: C::Color) {
|
|
//~^ ERROR ambiguous associated type `Color` in bounds of `C`
|
|
}
|
|
|
|
fn dent_object_2<COLOR>(c: &dyn BoxCar) where <dyn BoxCar as Vehicle>::Color = COLOR {
|
|
//~^ ERROR the value of the associated types
|
|
//~| ERROR equality constraints are not yet supported in `where` clauses
|
|
}
|
|
|
|
fn dent_object_3<X, COLOR>(c: X)
|
|
where X: BoxCar,
|
|
X: Vehicle<Color = COLOR>,
|
|
X: Box<Color = COLOR>
|
|
{} // OK!
|
|
|
|
pub fn main() { }
|