Fix some clippy issues found by 1.84.0 (#5603)

crates/eframe/src/epi.rs

@@ -878,20 +878,6 @@ pub trait Storage {
     fn flush(&mut self);
 }
 
-/// Stores nothing.
-#[derive(Clone, Default)]
-pub(crate) struct DummyStorage {}
-
-impl Storage for DummyStorage {
-    fn get_string(&self, _key: &str) -> Option<String> {
-        None
-    }
-
-    fn set_string(&mut self, _key: &str, _value: String) {}
-
-    fn flush(&mut self) {}
-}
-
 /// Get and deserialize the [RON](https://github.com/ron-rs/ron) stored at the given key.
 #[cfg(feature = "ron")]
 pub fn get_value<T: serde::de::DeserializeOwned>(storage: &dyn Storage, key: &str) -> Option<T> {

crates/eframe/src/native/glow_integration.rs

@@ -344,7 +344,7 @@ impl<'app> GlowWinitApp<'app> {
     }
 }
 
-impl<'app> WinitApp for GlowWinitApp<'app> {
+impl WinitApp for GlowWinitApp<'_> {
     fn egui_ctx(&self) -> Option<&egui::Context> {
         self.running.as_ref().map(|r| &r.integration.egui_ctx)
     }
@@ -479,7 +479,7 @@ impl<'app> WinitApp for GlowWinitApp<'app> {
     }
 }
 
-impl<'app> GlowWinitRunning<'app> {
+impl GlowWinitRunning<'_> {
     fn run_ui_and_paint(
         &mut self,
         event_loop: &ActiveEventLoop,

crates/eframe/src/native/wgpu_integration.rs

@@ -323,7 +323,7 @@ impl<'app> WgpuWinitApp<'app> {
     }
 }
 
-impl<'app> WinitApp for WgpuWinitApp<'app> {
+impl WinitApp for WgpuWinitApp<'_> {
     fn egui_ctx(&self) -> Option<&egui::Context> {
         self.running.as_ref().map(|r| &r.integration.egui_ctx)
     }
@@ -487,7 +487,7 @@ impl<'app> WinitApp for WgpuWinitApp<'app> {
     }
 }
 
-impl<'app> WgpuWinitRunning<'app> {
+impl WgpuWinitRunning<'_> {
     fn save_and_destroy(&mut self) {
         profiling::function_scope!();