Removed unneeded ResRef

Author: Guvante

crates/bevy_ecs/src/change_detection.rs

@@ -357,36 +357,6 @@ where
 change_detection_impl!(Ref<'a, T>, T,);
 impl_debug!(Ref<'a, T>,);
 
-
-/// Shared borrow of a [`Resource`] with change tracking metadata.
-///
-/// See the [`Resource`] documentation for usage.
-///
-/// # Panics
-///
-/// Panics when used as a [`SystemParam`](crate::system::SystemParam) if the resource does not exist.
-///
-/// Use `Option<ResRef<T>>` instead if the resource might not always exist.
-pub struct ResRef<'a, T: ?Sized + Resource> {
-    pub(crate) value: &'a T,
-    pub(crate) ticks: Ticks<'a>,
-}
-change_detection_impl!(ResRef<'a, T>, T, Resource);
-
-impl<'w, 'a, T: Resource> IntoIterator for &'a ResRef<'w, T>
-where
-    &'a T: IntoIterator,
-{
-    type Item = <&'a T as IntoIterator>::Item;
-    type IntoIter = <&'a T as IntoIterator>::IntoIter;
-
-    fn into_iter(self) -> Self::IntoIter {
-        self.value.into_iter()
-    }
-}
-
-impl_debug!(ResRef<'a, T>, Resource);
-
 /// Unique mutable borrow of a [`Resource`].
 ///
 /// See the [`Resource`] documentation for usage.