Remove test implementation of schedule_wake

embassy-executor/tests/test.rs

@@ -150,7 +150,3 @@ fn executor_task_cfg_args() {
         let (_, _, _) = (a, b, c);
     }
 }
-
-// We need this for the test to compile, even though we don't want to use timers at the moment.
-#[no_mangle]
-fn _embassy_time_schedule_wake(_at: u64, _waker: &core::task::Waker) {}