outline a panic

Author: joseph-gio

crates/bevy_app/src/sub_schedule.rs

@@ -218,12 +218,15 @@ impl SubSchedules {
     /// # Panics
     /// If the schedule is currently [extracted](#method.extract_scope).
     pub fn get_mut<S: Stage>(&mut self, label: impl ScheduleLabel) -> Option<&mut S> {
+        #[cold]
+        fn panic(label: impl Debug) -> ! {
+            panic!("cannot get sub-schedule '{label:?}', as it is currently extracted")
+        }
+
         let label = label.as_label();
         let sched = match self.map.get_mut(&label)?.0.as_deref_mut() {
             Some(x) => x,
-            None => {
-                panic!("cannot get sub-schedule '{label:?}', as it is currently extracted");
-            }
+            None => panic(label),
         };
         sched.downcast_mut()
     }