mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-07 14:13:47 +00:00
34 lines
645 B
Rust
34 lines
645 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
|
|
|
|
use std::convert::Into;
|
|
|
|
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);
|
|
}
|