mirror of
https://github.com/rust-lang/rust
synced 2024-11-05 20:45:15 +00:00
25 lines
416 B
Rust
25 lines
416 B
Rust
struct Params;
|
|
|
|
pub trait Plugin<E: ?Sized> {
|
|
type Error;
|
|
}
|
|
|
|
pub trait Pluggable {
|
|
fn get_ref<P: Plugin<Self>>(&mut self) -> Option<P::Error> {
|
|
None
|
|
}
|
|
}
|
|
|
|
struct Foo;
|
|
impl Plugin<Foo> for Params {
|
|
type Error = ();
|
|
}
|
|
|
|
impl<T: Copy> Pluggable for T {}
|
|
|
|
fn handle(req: &mut i32) {
|
|
req.get_ref::<Params>();
|
|
//~^ ERROR the trait bound `Params: Plugin<i32>` is not satisfied
|
|
}
|
|
|
|
fn main() {}
|