mirror of
https://github.com/rust-lang/rust
synced 2024-10-02 06:44:33 +00:00
33 lines
734 B
Rust
33 lines
734 B
Rust
use std::marker::PhantomData;
|
|
|
|
fn _alias_check() {
|
|
WrongImpl::foo(0i32);
|
|
//~^ ERROR the trait bound `RawImpl<_>: Raw<_>` is not satisfied
|
|
WrongImpl::<()>::foo(0i32);
|
|
//~^ ERROR the trait bound `RawImpl<()>: Raw<()>` is not satisfied
|
|
//~| ERROR trait bounds were not satisfied
|
|
CorrectImpl::foo(0i32);
|
|
}
|
|
|
|
pub trait Raw<T: ?Sized> {
|
|
type Value;
|
|
}
|
|
|
|
pub type WrongImpl<T> = SafeImpl<T, RawImpl<T>>;
|
|
|
|
pub type CorrectImpl<T> = SafeImpl<[T], RawImpl<T>>;
|
|
|
|
pub struct RawImpl<T>(PhantomData<T>);
|
|
|
|
impl<T> Raw<[T]> for RawImpl<T> {
|
|
type Value = T;
|
|
}
|
|
|
|
pub struct SafeImpl<T: ?Sized, A: Raw<T>>(PhantomData<(A, T)>);
|
|
|
|
impl<T: ?Sized, A: Raw<T>> SafeImpl<T, A> {
|
|
pub fn foo(value: A::Value) {}
|
|
}
|
|
|
|
fn main() {}
|