rust-clippy/tests/ui/issue_4266.rs

// compile-flags: --edition 2018
#![feature(async_await)]
#![allow(dead_code)]

// No edition 2018
#[rustfmt::skip]
mod m {
    async fn sink1<'a>(_: &'a str) {} // lint
    async fn sink1_elided(_: &str) {} // ok

    // lint
    async fn one_to_one<'a>(s: &'a str) -> &'a str {
        s
    }

    // ok
    async fn one_to_one_elided(s: &str) -> &str {
        s
    }

    // ok
    async fn all_to_one<'a>(a: &'a str, _b: &'a str) -> &'a str {
        a
    }

    // async fn unrelated(_: &str, _: &str) {} // Not allowed in async fn

    // #3988
    struct Foo;
    impl Foo {
        // ok
        pub async fn foo(&mut self) {}
    }

    // rust-lang/rust#61115
    // ok
    async fn print(s: &str) {
        println!("{}", s);
    }
}

fn main() {}