//@ edition: 2021 //@ check-pass use std::future::Future; use std::pin::Pin; #[allow(async_fn_in_trait)] pub trait MyTrait { async fn foo(&self) -> i32; } impl MyTrait for i32 { #[warn(refining_impl_trait)] fn foo(&self) -> Pin + '_>> { //~^ WARN impl trait in impl method signature does not match trait method signature Box::pin(async { *self }) } } fn main() {}