1error: future cannot be sent between threads safely 2 --> $DIR/send-not-implemented.rs:8:26 3 | 48 | async fn test(&self) { 5 | __________________________^ 69 | | let mutex = Mutex::new(()); 710 | | let _guard = mutex.lock().unwrap(); 811 | | f().await; 912 | | } 10 | |_____^ future created by async block is not `Send` 11 | 12 = help: within `impl Future`, the trait `Send` is not implemented for `MutexGuard<'_, ()>` 13note: future is not `Send` as this value is used across an await 14 --> $DIR/send-not-implemented.rs:11:9 15 | 1610 | let _guard = mutex.lock().unwrap(); 17 | ------ has type `MutexGuard<'_, ()>` which is not `Send` 1811 | f().await; 19 | ^^^^^^^^^ await occurs here, with `_guard` maybe used later 2012 | } 21 | - `_guard` is later dropped here 22 = note: required for the cast to the object type `dyn Future<Output = ()> + Send` 23 24error: future cannot be sent between threads safely 25 --> $DIR/send-not-implemented.rs:14:38 26 | 2714 | async fn test_ret(&self) -> bool { 28 | ______________________________________^ 2915 | | let mutex = Mutex::new(()); 3016 | | let _guard = mutex.lock().unwrap(); 3117 | | f().await; 3218 | | true 3319 | | } 34 | |_____^ future created by async block is not `Send` 35 | 36 = help: within `impl Future`, the trait `Send` is not implemented for `MutexGuard<'_, ()>` 37note: future is not `Send` as this value is used across an await 38 --> $DIR/send-not-implemented.rs:17:9 39 | 4016 | let _guard = mutex.lock().unwrap(); 41 | ------ has type `MutexGuard<'_, ()>` which is not `Send` 4217 | f().await; 43 | ^^^^^^^^^ await occurs here, with `_guard` maybe used later 4418 | true 4519 | } 46 | - `_guard` is later dropped here 47 = note: required for the cast to the object type `dyn Future<Output = bool> + Send` 48