Reorder impl to be the same as the trait (#10964)

# Objective

- Make the implementation order consistent between all sources to fit
the order in the trait.

## Solution

- Change the implementation order.

crates/bevy_ecs/src/event.rs

@@ -616,8 +616,12 @@ impl<'a, E: Event> Iterator for EventIterator<'a, E> {
         self.iter.next().map(|(event, _)| event)
     }
 
-    fn nth(&mut self, n: usize) -> Option<Self::Item> {
+    fn size_hint(&self) -> (usize, Option<usize>) {
-        self.iter.nth(n).map(|(event, _)| event)
+        self.iter.size_hint()
+    }
+
+    fn count(self) -> usize {
+        self.iter.count()
     }
 
     fn last(self) -> Option<Self::Item>
@@ -627,12 +631,8 @@ impl<'a, E: Event> Iterator for EventIterator<'a, E> {
         self.iter.last().map(|(event, _)| event)
     }
 
-    fn count(self) -> usize {
+    fn nth(&mut self, n: usize) -> Option<Self::Item> {
-        self.iter.count()
+        self.iter.nth(n).map(|(event, _)| event)
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        self.iter.size_hint()
     }
 }
 
@@ -696,16 +696,13 @@ impl<'a, E: Event> Iterator for EventIteratorWithId<'a, E> {
         }
     }
 
-    fn nth(&mut self, n: usize) -> Option<Self::Item> {
+    fn size_hint(&self) -> (usize, Option<usize>) {
-        if let Some(EventInstance { event_id, event }) = self.chain.nth(n) {
+        self.chain.size_hint()
-            self.reader.last_event_count += n + 1;
+    }
-            self.unread -= n + 1;
+
-            Some((event, *event_id))
+    fn count(self) -> usize {
-        } else {
+        self.reader.last_event_count += self.unread;
-            self.reader.last_event_count += self.unread;
+        self.unread
-            self.unread = 0;
-            None
-        }
     }
 
     fn last(self) -> Option<Self::Item>
@@ -717,13 +714,16 @@ impl<'a, E: Event> Iterator for EventIteratorWithId<'a, E> {
         Some((event, *event_id))
     }
 
-    fn count(self) -> usize {
+    fn nth(&mut self, n: usize) -> Option<Self::Item> {
-        self.reader.last_event_count += self.unread;
+        if let Some(EventInstance { event_id, event }) = self.chain.nth(n) {
-        self.unread
+            self.reader.last_event_count += n + 1;
-    }
+            self.unread -= n + 1;
-
+            Some((event, *event_id))
-    fn size_hint(&self) -> (usize, Option<usize>) {
+        } else {
-        self.chain.size_hint()
+            self.reader.last_event_count += self.unread;
+            self.unread = 0;
+            None
+        }
     }
 }
 

crates/bevy_ecs/src/query/fetch.rs

@@ -278,16 +278,14 @@ pub type ROQueryItem<'w, D> = QueryItem<'w, <D as QueryData>::ReadOnly>;
 /// `update_component_access` and `update_archetype_component_access` do nothing.
 /// This is sound because `fetch` does not access components.
 unsafe impl WorldQuery for Entity {
-    type Fetch<'w> = ();
     type Item<'w> = Entity;
+    type Fetch<'w> = ();
     type State = ();
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: Self::Item<'wlong>) -> Self::Item<'wshort> {
         item
     }
 
-    const IS_DENSE: bool = true;
-
     unsafe fn init_fetch<'w>(
         _world: UnsafeWorldCell<'w>,
         _state: &Self::State,
@@ -296,6 +294,8 @@ unsafe impl WorldQuery for Entity {
     ) -> Self::Fetch<'w> {
     }
 
+    const IS_DENSE: bool = true;
+
     #[inline]
     unsafe fn set_archetype<'w>(
         _fetch: &mut Self::Fetch<'w>,
@@ -350,16 +350,14 @@ unsafe impl ReadOnlyQueryData for Entity {}
 /// This is sound because `update_component_access` and `update_archetype_component_access` set read access for all components and panic when appropriate.
 /// Filters are unchanged.
 unsafe impl<'a> WorldQuery for EntityRef<'a> {
-    type Fetch<'w> = UnsafeWorldCell<'w>;
     type Item<'w> = EntityRef<'w>;
+    type Fetch<'w> = UnsafeWorldCell<'w>;
     type State = ();
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: Self::Item<'wlong>) -> Self::Item<'wshort> {
         item
     }
 
-    const IS_DENSE: bool = true;
-
     unsafe fn init_fetch<'w>(
         world: UnsafeWorldCell<'w>,
         _state: &Self::State,
@@ -369,6 +367,8 @@ unsafe impl<'a> WorldQuery for EntityRef<'a> {
         world
     }
 
+    const IS_DENSE: bool = true;
+
     #[inline]
     unsafe fn set_archetype<'w>(
         _fetch: &mut Self::Fetch<'w>,
@@ -432,16 +432,14 @@ unsafe impl ReadOnlyQueryData for EntityRef<'_> {}
 
 /// SAFETY: The accesses of `Self::ReadOnly` are a subset of the accesses of `Self`
 unsafe impl<'a> WorldQuery for EntityMut<'a> {
-    type Fetch<'w> = UnsafeWorldCell<'w>;
     type Item<'w> = EntityMut<'w>;
+    type Fetch<'w> = UnsafeWorldCell<'w>;
     type State = ();
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: Self::Item<'wlong>) -> Self::Item<'wshort> {
         item
     }
 
-    const IS_DENSE: bool = true;
-
     unsafe fn init_fetch<'w>(
         world: UnsafeWorldCell<'w>,
         _state: &Self::State,
@@ -451,6 +449,8 @@ unsafe impl<'a> WorldQuery for EntityMut<'a> {
         world
     }
 
+    const IS_DENSE: bool = true;
+
     #[inline]
     unsafe fn set_archetype<'w>(
         _fetch: &mut Self::Fetch<'w>,
@@ -530,21 +530,14 @@ impl<T> Copy for ReadFetch<'_, T> {}
 /// `update_component_access` adds a `With` filter for a component.
 /// This is sound because `matches_component_set` returns whether the set contains that component.
 unsafe impl<T: Component> WorldQuery for &T {
-    type Fetch<'w> = ReadFetch<'w, T>;
     type Item<'w> = &'w T;
+    type Fetch<'w> = ReadFetch<'w, T>;
     type State = ComponentId;
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: &'wlong T) -> &'wshort T {
         item
     }
 
-    const IS_DENSE: bool = {
-        match T::Storage::STORAGE_TYPE {
-            StorageType::Table => true,
-            StorageType::SparseSet => false,
-        }
-    };
-
     #[inline]
     unsafe fn init_fetch<'w>(
         world: UnsafeWorldCell<'w>,
@@ -568,6 +561,13 @@ unsafe impl<T: Component> WorldQuery for &T {
         }
     }
 
+    const IS_DENSE: bool = {
+        match T::Storage::STORAGE_TYPE {
+            StorageType::Table => true,
+            StorageType::SparseSet => false,
+        }
+    };
+
     #[inline]
     unsafe fn set_archetype<'w>(
         fetch: &mut ReadFetch<'w, T>,
@@ -686,21 +686,14 @@ impl<T> Copy for RefFetch<'_, T> {}
 /// `update_component_access` adds a `With` filter for a component.
 /// This is sound because `matches_component_set` returns whether the set contains that component.
 unsafe impl<'__w, T: Component> WorldQuery for Ref<'__w, T> {
-    type Fetch<'w> = RefFetch<'w, T>;
     type Item<'w> = Ref<'w, T>;
+    type Fetch<'w> = RefFetch<'w, T>;
     type State = ComponentId;
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: Ref<'wlong, T>) -> Ref<'wshort, T> {
         item
     }
 
-    const IS_DENSE: bool = {
-        match T::Storage::STORAGE_TYPE {
-            StorageType::Table => true,
-            StorageType::SparseSet => false,
-        }
-    };
-
     #[inline]
     unsafe fn init_fetch<'w>(
         world: UnsafeWorldCell<'w>,
@@ -723,6 +716,13 @@ unsafe impl<'__w, T: Component> WorldQuery for Ref<'__w, T> {
         }
     }
 
+    const IS_DENSE: bool = {
+        match T::Storage::STORAGE_TYPE {
+            StorageType::Table => true,
+            StorageType::SparseSet => false,
+        }
+    };
+
     #[inline]
     unsafe fn set_archetype<'w>(
         fetch: &mut RefFetch<'w, T>,
@@ -853,21 +853,14 @@ impl<T> Copy for WriteFetch<'_, T> {}
 /// `update_component_access` adds a `With` filter for a component.
 /// This is sound because `matches_component_set` returns whether the set contains that component.
 unsafe impl<'__w, T: Component> WorldQuery for &'__w mut T {
-    type Fetch<'w> = WriteFetch<'w, T>;
     type Item<'w> = Mut<'w, T>;
+    type Fetch<'w> = WriteFetch<'w, T>;
     type State = ComponentId;
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: Mut<'wlong, T>) -> Mut<'wshort, T> {
         item
     }
 
-    const IS_DENSE: bool = {
-        match T::Storage::STORAGE_TYPE {
-            StorageType::Table => true,
-            StorageType::SparseSet => false,
-        }
-    };
-
     #[inline]
     unsafe fn init_fetch<'w>(
         world: UnsafeWorldCell<'w>,
@@ -890,6 +883,13 @@ unsafe impl<'__w, T: Component> WorldQuery for &'__w mut T {
         }
     }
 
+    const IS_DENSE: bool = {
+        match T::Storage::STORAGE_TYPE {
+            StorageType::Table => true,
+            StorageType::SparseSet => false,
+        }
+    };
+
     #[inline]
     unsafe fn set_archetype<'w>(
         fetch: &mut WriteFetch<'w, T>,
@@ -1009,16 +1009,14 @@ impl<T: WorldQuery> Clone for OptionFetch<'_, T> {
 /// This is sound because `update_component_access` and `update_archetype_component_access` add the same accesses as `T`.
 /// Filters are unchanged.
 unsafe impl<T: WorldQuery> WorldQuery for Option<T> {
-    type Fetch<'w> = OptionFetch<'w, T>;
     type Item<'w> = Option<T::Item<'w>>;
+    type Fetch<'w> = OptionFetch<'w, T>;
     type State = T::State;
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: Self::Item<'wlong>) -> Self::Item<'wshort> {
         item.map(T::shrink)
     }
 
-    const IS_DENSE: bool = T::IS_DENSE;
-
     #[inline]
     unsafe fn init_fetch<'w>(
         world: UnsafeWorldCell<'w>,
@@ -1032,6 +1030,8 @@ unsafe impl<T: WorldQuery> WorldQuery for Option<T> {
         }
     }
 
+    const IS_DENSE: bool = T::IS_DENSE;
+
     #[inline]
     unsafe fn set_archetype<'w>(
         fetch: &mut OptionFetch<'w, T>,
@@ -1168,21 +1168,14 @@ pub struct Has<T>(PhantomData<T>);
 /// `update_component_access` and `update_archetype_component_access` do nothing.
 /// This is sound because `fetch` does not access components.
 unsafe impl<T: Component> WorldQuery for Has<T> {
-    type Fetch<'w> = bool;
     type Item<'w> = bool;
+    type Fetch<'w> = bool;
     type State = ComponentId;
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: Self::Item<'wlong>) -> Self::Item<'wshort> {
         item
     }
 
-    const IS_DENSE: bool = {
-        match T::Storage::STORAGE_TYPE {
-            StorageType::Table => true,
-            StorageType::SparseSet => false,
-        }
-    };
-
     #[inline]
     unsafe fn init_fetch<'w>(
         _world: UnsafeWorldCell<'w>,
@@ -1193,6 +1186,13 @@ unsafe impl<T: Component> WorldQuery for Has<T> {
         false
     }
 
+    const IS_DENSE: bool = {
+        match T::Storage::STORAGE_TYPE {
+            StorageType::Table => true,
+            StorageType::SparseSet => false,
+        }
+    };
+
     #[inline]
     unsafe fn set_archetype<'w>(
         fetch: &mut Self::Fetch<'w>,
@@ -1408,14 +1408,12 @@ pub struct NopWorldQuery<D: QueryData>(PhantomData<D>);
 /// `update_component_access` and `update_archetype_component_access` do nothing.
 /// This is sound because `fetch` does not access components.
 unsafe impl<D: QueryData> WorldQuery for NopWorldQuery<D> {
-    type Fetch<'w> = ();
     type Item<'w> = ();
+    type Fetch<'w> = ();
     type State = D::State;
 
     fn shrink<'wlong: 'wshort, 'wshort>(_: ()) {}
 
-    const IS_DENSE: bool = D::IS_DENSE;
-
     #[inline(always)]
     unsafe fn init_fetch(
         _world: UnsafeWorldCell,
@@ -1425,6 +1423,8 @@ unsafe impl<D: QueryData> WorldQuery for NopWorldQuery<D> {
     ) {
     }
 
+    const IS_DENSE: bool = D::IS_DENSE;
+
     #[inline(always)]
     unsafe fn set_archetype(
         _fetch: &mut (),

crates/bevy_ecs/src/query/filter.rs

@@ -128,8 +128,8 @@ pub struct With<T>(PhantomData<T>);
 /// `update_component_access` adds a `With` filter for `T`.
 /// This is sound because `matches_component_set` returns whether the set contains the component.
 unsafe impl<T: Component> WorldQuery for With<T> {
-    type Fetch<'w> = ();
     type Item<'w> = ();
+    type Fetch<'w> = ();
     type State = ComponentId;
 
     fn shrink<'wlong: 'wshort, 'wshort>(_: Self::Item<'wlong>) -> Self::Item<'wshort> {}
@@ -150,9 +150,6 @@ unsafe impl<T: Component> WorldQuery for With<T> {
         }
     };
 
-    #[inline]
-    unsafe fn set_table(_fetch: &mut (), _state: &ComponentId, _table: &Table) {}
-
     #[inline]
     unsafe fn set_archetype(
         _fetch: &mut (),
@@ -162,6 +159,9 @@ unsafe impl<T: Component> WorldQuery for With<T> {
     ) {
     }
 
+    #[inline]
+    unsafe fn set_table(_fetch: &mut (), _state: &ComponentId, _table: &Table) {}
+
     #[inline(always)]
     unsafe fn fetch<'w>(
         _fetch: &mut Self::Fetch<'w>,
@@ -240,8 +240,8 @@ pub struct Without<T>(PhantomData<T>);
 /// `update_component_access` adds a `Without` filter for `T`.
 /// This is sound because `matches_component_set` returns whether the set does not contain the component.
 unsafe impl<T: Component> WorldQuery for Without<T> {
-    type Fetch<'w> = ();
     type Item<'w> = ();
+    type Fetch<'w> = ();
     type State = ComponentId;
 
     fn shrink<'wlong: 'wshort, 'wshort>(_: Self::Item<'wlong>) -> Self::Item<'wshort> {}
@@ -262,9 +262,6 @@ unsafe impl<T: Component> WorldQuery for Without<T> {
         }
     };
 
-    #[inline]
-    unsafe fn set_table(_fetch: &mut (), _state: &Self::State, _table: &Table) {}
-
     #[inline]
     unsafe fn set_archetype(
         _fetch: &mut (),
@@ -274,6 +271,9 @@ unsafe impl<T: Component> WorldQuery for Without<T> {
     ) {
     }
 
+    #[inline]
+    unsafe fn set_table(_fetch: &mut (), _state: &Self::State, _table: &Table) {}
+
     #[inline(always)]
     unsafe fn fetch<'w>(
         _fetch: &mut Self::Fetch<'w>,
@@ -561,8 +561,8 @@ pub struct AddedFetch<'w> {
 /// `update_component_access` adds a `With` filter for a component.
 /// This is sound because `matches_component_set` returns whether the set contains that component.
 unsafe impl<T: Component> WorldQuery for Added<T> {
-    type Fetch<'w> = AddedFetch<'w>;
     type Item<'w> = bool;
+    type Fetch<'w> = AddedFetch<'w>;
     type State = ComponentId;
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: Self::Item<'wlong>) -> Self::Item<'wshort> {
@@ -592,18 +592,6 @@ unsafe impl<T: Component> WorldQuery for Added<T> {
         }
     };
 
-    #[inline]
-    unsafe fn set_table<'w>(
-        fetch: &mut Self::Fetch<'w>,
-        &component_id: &ComponentId,
-        table: &'w Table,
-    ) {
-        fetch.table_ticks = Some(
-            Column::get_added_ticks_slice(table.get_column(component_id).debug_checked_unwrap())
-                .into(),
-        );
-    }
-
     #[inline]
     unsafe fn set_archetype<'w>(
         fetch: &mut Self::Fetch<'w>,
@@ -616,6 +604,18 @@ unsafe impl<T: Component> WorldQuery for Added<T> {
         }
     }
 
+    #[inline]
+    unsafe fn set_table<'w>(
+        fetch: &mut Self::Fetch<'w>,
+        &component_id: &ComponentId,
+        table: &'w Table,
+    ) {
+        fetch.table_ticks = Some(
+            Column::get_added_ticks_slice(table.get_column(component_id).debug_checked_unwrap())
+                .into(),
+        );
+    }
+
     #[inline(always)]
     unsafe fn fetch<'w>(
         fetch: &mut Self::Fetch<'w>,
@@ -737,8 +737,8 @@ pub struct ChangedFetch<'w> {
 /// `update_component_access` adds a `With` filter for a component.
 /// This is sound because `matches_component_set` returns whether the set contains that component.
 unsafe impl<T: Component> WorldQuery for Changed<T> {
-    type Fetch<'w> = ChangedFetch<'w>;
     type Item<'w> = bool;
+    type Fetch<'w> = ChangedFetch<'w>;
     type State = ComponentId;
 
     fn shrink<'wlong: 'wshort, 'wshort>(item: Self::Item<'wlong>) -> Self::Item<'wshort> {
@@ -768,18 +768,6 @@ unsafe impl<T: Component> WorldQuery for Changed<T> {
         }
     };
 
-    #[inline]
-    unsafe fn set_table<'w>(
-        fetch: &mut Self::Fetch<'w>,
-        &component_id: &ComponentId,
-        table: &'w Table,
-    ) {
-        fetch.table_ticks = Some(
-            Column::get_changed_ticks_slice(table.get_column(component_id).debug_checked_unwrap())
-                .into(),
-        );
-    }
-
     #[inline]
     unsafe fn set_archetype<'w>(
         fetch: &mut Self::Fetch<'w>,
@@ -792,6 +780,18 @@ unsafe impl<T: Component> WorldQuery for Changed<T> {
         }
     }
 
+    #[inline]
+    unsafe fn set_table<'w>(
+        fetch: &mut Self::Fetch<'w>,
+        &component_id: &ComponentId,
+        table: &'w Table,
+    ) {
+        fetch.table_ticks = Some(
+            Column::get_changed_ticks_slice(table.get_column(component_id).debug_checked_unwrap())
+                .into(),
+        );
+    }
+
     #[inline(always)]
     unsafe fn fetch<'w>(
         fetch: &mut Self::Fetch<'w>,

crates/bevy_ecs/src/schedule/config.rs

@@ -390,6 +390,11 @@ impl IntoSystemConfigs<()> for SystemConfigs {
         self
     }
 
+    fn run_if<M>(mut self, condition: impl Condition<M>) -> SystemConfigs {
+        self.run_if_dyn(new_condition(condition));
+        self
+    }
+
     fn ambiguous_with<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
         let set = set.into_system_set();
         self.ambiguous_with_inner(set.intern());
@@ -401,11 +406,6 @@ impl IntoSystemConfigs<()> for SystemConfigs {
         self
     }
 
-    fn run_if<M>(mut self, condition: impl Condition<M>) -> SystemConfigs {
-        self.run_if_dyn(new_condition(condition));
-        self
-    }
-
     fn chain(self) -> Self {
         self.chain_inner()
     }

crates/bevy_ecs/src/schedule/executor/multi_threaded.rs

@@ -128,10 +128,6 @@ impl SystemExecutor for MultiThreadedExecutor {
         ExecutorKind::MultiThreaded
     }
 
-    fn set_apply_final_deferred(&mut self, value: bool) {
-        self.apply_final_deferred = value;
-    }
-
     fn init(&mut self, schedule: &SystemSchedule) {
         // pre-allocate space
         let sys_count = schedule.system_ids.len();
@@ -261,6 +257,10 @@ impl SystemExecutor for MultiThreadedExecutor {
         self.skipped_systems.clear();
         self.completed_systems.clear();
     }
+
+    fn set_apply_final_deferred(&mut self, value: bool) {
+        self.apply_final_deferred = value;
+    }
 }
 
 impl MultiThreadedExecutor {

crates/bevy_ecs/src/schedule/executor/simple.rs

@@ -23,10 +23,6 @@ impl SystemExecutor for SimpleExecutor {
         ExecutorKind::Simple
     }
 
-    fn set_apply_final_deferred(&mut self, _: bool) {
-        // do nothing. simple executor does not do a final sync
-    }
-
     fn init(&mut self, schedule: &SystemSchedule) {
         let sys_count = schedule.system_ids.len();
         let set_count = schedule.set_ids.len();
@@ -91,6 +87,10 @@ impl SystemExecutor for SimpleExecutor {
         self.evaluated_sets.clear();
         self.completed_systems.clear();
     }
+
+    fn set_apply_final_deferred(&mut self, _: bool) {
+        // do nothing. simple executor does not do a final sync
+    }
 }
 
 impl SimpleExecutor {

crates/bevy_ecs/src/schedule/executor/single_threaded.rs

@@ -29,10 +29,6 @@ impl SystemExecutor for SingleThreadedExecutor {
         ExecutorKind::SingleThreaded
     }
 
-    fn set_apply_final_deferred(&mut self, apply_final_deferred: bool) {
-        self.apply_final_deferred = apply_final_deferred;
-    }
-
     fn init(&mut self, schedule: &SystemSchedule) {
         // pre-allocate space
         let sys_count = schedule.system_ids.len();
@@ -105,6 +101,10 @@ impl SystemExecutor for SingleThreadedExecutor {
         self.evaluated_sets.clear();
         self.completed_systems.clear();
     }
+
+    fn set_apply_final_deferred(&mut self, apply_final_deferred: bool) {
+        self.apply_final_deferred = apply_final_deferred;
+    }
 }
 
 impl SingleThreadedExecutor {

crates/bevy_ecs/src/schedule/set.rs

@@ -131,6 +131,10 @@ impl SystemSet for AnonymousSet {
         true
     }
 
+    fn dyn_clone(&self) -> Box<dyn SystemSet> {
+        Box::new(*self)
+    }
+
     fn as_dyn_eq(&self) -> &dyn DynEq {
         self
     }
@@ -139,10 +143,6 @@ impl SystemSet for AnonymousSet {
         TypeId::of::<Self>().hash(&mut state);
         self.hash(&mut state);
     }
-
-    fn dyn_clone(&self) -> Box<dyn SystemSet> {
-        Box::new(*self)
-    }
 }
 
 /// Types that can be converted into a [`SystemSet`].

crates/bevy_ecs/src/system/adapter_system.rs

@@ -135,6 +135,10 @@ where
         self.system.check_change_tick(change_tick);
     }
 
+    fn default_system_sets(&self) -> Vec<InternedSystemSet> {
+        self.system.default_system_sets()
+    }
+
     fn get_last_run(&self) -> crate::component::Tick {
         self.system.get_last_run()
     }
@@ -142,10 +146,6 @@ where
     fn set_last_run(&mut self, last_run: crate::component::Tick) {
         self.system.set_last_run(last_run);
     }
-
-    fn default_system_sets(&self) -> Vec<InternedSystemSet> {
-        self.system.default_system_sets()
-    }
 }
 
 // SAFETY: The inner system is read-only.

crates/bevy_ecs/src/system/combinator.rs

@@ -218,6 +218,12 @@ where
         self.b.check_change_tick(change_tick);
     }
 
+    fn default_system_sets(&self) -> Vec<InternedSystemSet> {
+        let mut default_sets = self.a.default_system_sets();
+        default_sets.append(&mut self.b.default_system_sets());
+        default_sets
+    }
+
     fn get_last_run(&self) -> Tick {
         self.a.get_last_run()
     }
@@ -226,12 +232,6 @@ where
         self.a.set_last_run(last_run);
         self.b.set_last_run(last_run);
     }
-
-    fn default_system_sets(&self) -> Vec<InternedSystemSet> {
-        let mut default_sets = self.a.default_system_sets();
-        default_sets.append(&mut self.b.default_system_sets());
-        default_sets
-    }
 }
 
 /// SAFETY: Both systems are read-only, so any system created by combining them will only read from the world.

crates/bevy_ecs/src/system/exclusive_function_system.rs

@@ -88,6 +88,11 @@ where
         false
     }
 
+    #[inline]
+    fn is_exclusive(&self) -> bool {
+        true
+    }
+
     #[inline]
     unsafe fn run_unsafe(&mut self, _input: Self::In, _world: UnsafeWorldCell) -> Self::Out {
         panic!("Cannot run exclusive systems with a shared World reference");
@@ -114,19 +119,6 @@ where
         out
     }
 
-    #[inline]
-    fn is_exclusive(&self) -> bool {
-        true
-    }
-
-    fn get_last_run(&self) -> Tick {
-        self.system_meta.last_run
-    }
-
-    fn set_last_run(&mut self, last_run: Tick) {
-        self.system_meta.last_run = last_run;
-    }
-
     #[inline]
     fn apply_deferred(&mut self, _world: &mut World) {
         // "pure" exclusive systems do not have any buffers to apply.
@@ -155,6 +147,14 @@ where
         let set = crate::schedule::SystemTypeSet::<F>::new();
         vec![set.intern()]
     }
+
+    fn get_last_run(&self) -> Tick {
+        self.system_meta.last_run
+    }
+
+    fn set_last_run(&mut self, last_run: Tick) {
+        self.system_meta.last_run = last_run;
+    }
 }
 
 /// A trait implemented for all exclusive system functions that can be used as [`System`]s.

crates/bevy_ecs/src/system/function_system.rs

@@ -487,14 +487,6 @@ where
         out
     }
 
-    fn get_last_run(&self) -> Tick {
-        self.system_meta.last_run
-    }
-
-    fn set_last_run(&mut self, last_run: Tick) {
-        self.system_meta.last_run = last_run;
-    }
-
     #[inline]
     fn apply_deferred(&mut self, world: &mut World) {
         let param_state = self.param_state.as_mut().expect(Self::PARAM_MESSAGE);
@@ -533,6 +525,14 @@ where
         let set = crate::schedule::SystemTypeSet::<F>::new();
         vec![set.intern()]
     }
+
+    fn get_last_run(&self) -> Tick {
+        self.system_meta.last_run
+    }
+
+    fn set_last_run(&mut self, last_run: Tick) {
+        self.system_meta.last_run = last_run;
+    }
 }
 
 /// SAFETY: `F`'s param is [`ReadOnlySystemParam`], so this system will only read from the world.