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rust/src/test/ui/async-await/in-trait/async-generics.rs

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// edition: 2021
#![feature(async_fn_in_trait)]
#![allow(incomplete_features)]
trait MyTrait<T, U> {
async fn foo(&self) -> &(T, U);
}
//~^^ ERROR the parameter type `U` may not live long enough
//~| ERROR the parameter type `T` may not live long enough
impl<T, U> MyTrait<T, U> for (T, U) {
async fn foo(&self) -> &(T, U) {
self
}
}
fn main() {}