Update

src/main.rs

@@ -5,14 +5,25 @@ pub mod core;
 pub mod game;
 pub mod vulkan;
 
-fn main() -> Result<(), impl Error> {
+fn main() -> Result<(), Box<dyn Error>> {
     env_logger::init();
 
+    run_old_app()
+}
+
+fn run_new_app() -> Result<(), Box<dyn Error>> {
+    let mut app = core::app::App::default();
+    app.run()
+}
+
+fn run_old_app() -> Result<(), Box<dyn Error>> {
     let event_loop = EventLoop::new().unwrap();
     event_loop.set_control_flow(ControlFlow::Poll);
 
     let vulkan_context = vulkan::vulkan_context::VulkanContext::from(&event_loop);
-    let mut app = core::app::App::from(vulkan_context);
+    let mut app = core::old_app::App::from(vulkan_context);
 
-    event_loop.run_app(&mut app)
+    event_loop.run_app(&mut app).map_err(Box::new)?;
+
+    Ok(())
 }