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// check-pass
// edition: 2021

use std::fmt::Debug;

trait MyTrait<'a, 'b, T> {
    #[allow(async_fn_in_trait)]
    async fn foo(&'a self, key: &'b T) -> (&'a Self, &'b T) where T: Debug + Sized;
}

impl<'a, 'b, T, U> MyTrait<'a, 'b, T> for U {
    async fn foo(&'a self, key: &'b T) -> (&'a U, &'b T) {
        (self, key)
    }
}

fn main() {}