// edition:2018 use std::any::Any; use std::future::Future; struct Client(Box); impl Client { fn status(&self) -> u16 { 200 } } async fn get() { } pub fn foo() -> impl Future + Send { //~^ ERROR future cannot be sent between threads safely let client = Client(Box::new(true)); async move { match client.status() { 200 => { let _x = get().await; }, _ => (), } } } fn main() {}