#![feature(async_closure)] // edition:2018 fn main() {} async fn an_async_block() -> u32 { async { let x: Option = None; x?; //~ ERROR the `?` operator 22 } .await } async fn async_closure_containing_fn() -> u32 { let async_closure = async || { let x: Option = None; x?; //~ ERROR the `?` operator 22_u32 }; async_closure().await } async fn an_async_function() -> u32 { let x: Option = None; x?; //~ ERROR the `?` operator 22 }