| 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() {} |