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 | 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() {}
 |