rust/tests/ui/specialization/specialization-translate-projections.rs
2024-02-16 20:02:50 +00:00

33 lines
622 B
Rust

//@ run-pass
// Ensure that provided items are inherited properly even when impls vary in
// type parameters *and* rely on projections.
#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
trait Trait {
fn to_u8(&self) -> u8;
}
trait WithAssoc {
type Item;
fn to_item(&self) -> Self::Item;
}
impl<T, U> Trait for T where T: WithAssoc<Item=U>, U: Into<u8> {
fn to_u8(&self) -> u8 {
self.to_item().into()
}
}
impl WithAssoc for u8 {
type Item = u8;
fn to_item(&self) -> u8 { *self }
}
impl Trait for u8 {}
fn main() {
assert!(3u8.to_u8() == 3u8);
}