fix new clippy lints (bevyengine#5160)

# Objective

- Nightly clippy lints should be fixed before they get stable and break CI
  
## Solution

- fix new clippy lints
- ignore `significant_drop_in_scrutinee` since it isn't relevant in our loop rust-lang/rust-clippy#8987
```rust
for line in io::stdin().lines() {
    ...
}
```

Co-authored-by: Jakob Hellermann <hellermann@sipgate.de>

Author: jakobhellermann

crates/bevy_ecs/macros/src/fetch.rs

@@ -361,7 +361,7 @@ pub fn derive_world_query_impl(ast: DeriveInput) -> TokenStream {
         }
     };
 
-    let tokens = TokenStream::from(quote! {
+    TokenStream::from(quote! {
         #fetch_impl
 
         #state_impl
@@ -421,8 +421,7 @@ pub fn derive_world_query_impl(ast: DeriveInput) -> TokenStream {
                 #(q.#ignored_field_idents;)*
             }
         };
-    });
-    tokens
+    })
 }
 
 struct WorldQueryFieldInfo {

crates/bevy_ecs/src/query/state.rs

@@ -1230,7 +1230,7 @@ impl<Q: WorldQuery, F: WorldQuery> QueryState<Q, F> {
 
 /// An error that occurs when retrieving a specific [`Entity`]'s query result.
 // TODO: return the type_name as part of this error
-#[derive(Debug, PartialEq, Clone, Copy)]
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
 pub enum QueryEntityError {
     QueryDoesNotMatch(Entity),
     NoSuchEntity(Entity),

crates/bevy_gltf/src/loader.rs

@@ -1027,8 +1027,7 @@ async fn load_buffers(
                     Err(()) => {
                         // TODO: Remove this and add dep
                         let buffer_path = asset_path.parent().unwrap().join(uri);
-                        let buffer_bytes = load_context.read_asset_bytes(buffer_path).await?;
-                        buffer_bytes
+                        load_context.read_asset_bytes(buffer_path).await?
                     }
                 };
                 buffer_data.push(buffer_bytes);

crates/bevy_render/src/render_resource/pipeline.rs

@@ -157,7 +157,7 @@ impl VertexBufferLayout {
 }
 
 /// Describes the fragment process in a render pipeline.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct FragmentState {
     /// The compiled shader module for this stage.
     pub shader: Handle<Shader>,

crates/bevy_ui/src/ui_node.rs

@@ -139,7 +139,7 @@ impl Default for Style {
 }
 
 /// How items are aligned according to the cross axis
-#[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum AlignItems {
     /// Items are aligned at the start
@@ -156,7 +156,7 @@ pub enum AlignItems {
 }
 
 /// Works like [`AlignItems`] but applies only to a single item
-#[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum AlignSelf {
     /// Use the value of [`AlignItems`]
@@ -177,7 +177,7 @@ pub enum AlignSelf {
 /// Defines how each line is aligned within the flexbox.
 ///
 /// It only applies if [`FlexWrap::Wrap`] is present and if there are multiple lines of items.
-#[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum AlignContent {
     /// Each line moves towards the start of the cross axis
@@ -200,7 +200,7 @@ pub enum AlignContent {
 /// Defines the text direction
 ///
 /// For example English is written LTR (left-to-right) while Arabic is written RTL (right-to-left).
-#[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum Direction {
     /// Inherit from parent node
@@ -213,7 +213,7 @@ pub enum Direction {
 }
 
 /// Whether to use Flexbox layout
-#[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum Display {
     /// Use flexbox
@@ -224,7 +224,7 @@ pub enum Display {
 }
 
 /// Defines how flexbox items are ordered within a flexbox
-#[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum FlexDirection {
     /// Same way as text direction along the main axis
@@ -239,7 +239,7 @@ pub enum FlexDirection {
 }
 
 /// Defines how items are aligned according to the main axis
-#[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum JustifyContent {
     /// Pushed towards the start
@@ -258,7 +258,7 @@ pub enum JustifyContent {
 }
 
 /// Whether to show or hide overflowing items
-#[derive(Copy, Clone, PartialEq, Debug, Default, Reflect, Serialize, Deserialize)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Reflect, Serialize, Deserialize)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum Overflow {
     /// Show overflowing items
@@ -269,7 +269,7 @@ pub enum Overflow {
 }
 
 /// The strategy used to position this node
-#[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum PositionType {
     /// Relative to all other nodes with the [`PositionType::Relative`] value
@@ -282,7 +282,7 @@ pub enum PositionType {
 }
 
 /// Defines if flexbox items appear on a single line or on multiple lines
-#[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum FlexWrap {
     /// Single line, will overflow if needed

crates/bevy_window/src/window.rs

@@ -267,7 +267,7 @@ pub enum WindowCommand {
 }
 
 /// Defines the way a window is displayed.
-#[derive(Debug, Clone, Copy, PartialEq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum WindowMode {
     /// Creates a window that uses the given size.
     Windowed,

examples/app/custom_loop.rs

@@ -2,13 +2,13 @@
 //! lines from stdin and prints them from within the ecs.
 
 use bevy::prelude::*;
-use std::{io, io::BufRead};
+use std::io;
 
 struct Input(String);
 
 fn my_runner(mut app: App) {
     println!("Type stuff into the console");
-    for line in io::stdin().lock().lines() {
+    for line in io::stdin().lines() {
         {
             let mut input = app.world.resource_mut::<Input>();
             input.0 = line.unwrap();

examples/reflection/reflection_types.rs

@@ -36,7 +36,7 @@ pub struct C(usize);
 /// These are exposed via methods like `Reflect::hash()`, `Reflect::partial_eq()`, and
 /// `Reflect::serialize()`. You can force these implementations to use the actual trait
 /// implementations (instead of their defaults) like this:
-#[derive(Reflect, Hash, Serialize, PartialEq)]
+#[derive(Reflect, Hash, Serialize, PartialEq, Eq)]
 #[reflect(Hash, Serialize, PartialEq)]
 pub struct D {
     x: usize,
@@ -47,7 +47,7 @@ pub struct D {
 /// generally a good idea to implement (and reflect) the `PartialEq`, `Serialize`, and `Deserialize`
 /// traits on `reflect_value` types to ensure that these values behave as expected when nested
 /// underneath Reflect-ed structs.
-#[derive(Reflect, Copy, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Reflect, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[reflect_value(PartialEq, Serialize, Deserialize)]
 pub enum E {
     X,