File: edition-2015.rs

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rustc 1.87.0%2Bdfsg1-1
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fn foo(x: impl async Fn()) -> impl async Fn() { x }
//~^ ERROR `async` trait bounds are only allowed in Rust 2018 or later
//~| ERROR `async` trait bounds are only allowed in Rust 2018 or later
//~| ERROR `async` trait bounds are unstable
//~| ERROR `async` trait bounds are unstable

fn main() {}