Remove allow(unused_mut) in winit::application

Author: hecrj

winit/src/application.rs

@@ -213,8 +213,7 @@ where
 
     let mut context = task::Context::from_waker(task::noop_waker_ref());
 
-    #[allow(unused_mut)]
-    let mut process_event =
+    let process_event =
         move |event, event_loop: &winit::event_loop::EventLoopWindowTarget<_>| {
             if event_loop.exiting() {
                 return;
@@ -244,20 +243,24 @@ where
     // since the event loop does not resume during resize interaction.
     // More details: https://github.com/rust-windowing/winit/issues/3272
     #[cfg(target_os = "windows")]
-    let _ = event_loop.run(move |event, event_loop| {
-        if matches!(
-            event,
-            winit::event::Event::WindowEvent {
-                event: winit::event::WindowEvent::Resized(_),
-                ..
+    {
+        let mut process_event = process_event;
+
+        let _ = event_loop.run(move |event, event_loop| {
+            if matches!(
+                event,
+                winit::event::Event::WindowEvent {
+                    event: winit::event::WindowEvent::Resized(_),
+                    ..
+                }
+            ) {
+                process_event(event, event_loop);
+                process_event(winit::event::Event::AboutToWait, event_loop);
+            } else {
+                process_event(event, event_loop);
             }
-        ) {
-            process_event(event, event_loop);
-            process_event(winit::event::Event::AboutToWait, event_loop);
-        } else {
-            process_event(event, event_loop);
-        }
-    });
+        });
+    }
 
     Ok(())
 }