Okay, I guess I have to give these a different feature name

Author: clarfonthey

Diff for: alloc/src/collections/binary_heap/mod.rs

@@ -1433,7 +1433,7 @@ pub struct Iter<'a, T: 'a> {
     iter: slice::Iter<'a, T>,
 }
 
-#[stable(feature = "default_iters", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "default_iters_sequel", since = "CURRENT_RUSTC_VERSION")]
 impl<T> Default for Iter<'_, T> {
     /// Creates an empty `binary_heap::Iter`.
     ///

Diff for: alloc/src/collections/btree/map.rs

@@ -2016,7 +2016,7 @@ impl<K, V> Default for Range<'_, K, V> {
     }
 }
 
-#[stable(feature = "default_iters", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "default_iters_sequel", since = "CURRENT_RUSTC_VERSION")]
 impl<K, V> Default for RangeMut<'_, K, V> {
     /// Creates an empty `btree_map::RangeMut`.
     ///
@@ -2064,7 +2064,7 @@ impl<K, V> ExactSizeIterator for ValuesMut<'_, K, V> {
 #[stable(feature = "fused", since = "1.26.0")]
 impl<K, V> FusedIterator for ValuesMut<'_, K, V> {}
 
-#[stable(feature = "default_iters", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "default_iters_sequel", since = "CURRENT_RUSTC_VERSION")]
 impl<K, V> Default for ValuesMut<'_, K, V> {
     /// Creates an empty `btree_map::ValuesMut`.
     ///

Diff for: alloc/src/collections/vec_deque/iter.rs

@@ -28,7 +28,7 @@ impl<T: fmt::Debug> fmt::Debug for Iter<'_, T> {
     }
 }
 
-#[stable(feature = "default_iters", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "default_iters_sequel", since = "CURRENT_RUSTC_VERSION")]
 impl<T> Default for Iter<'_, T> {
     /// Creates an empty `vec_deque::Iter`.
     ///

Diff for: alloc/src/collections/vec_deque/iter_mut.rs

@@ -28,7 +28,7 @@ impl<T: fmt::Debug> fmt::Debug for IterMut<'_, T> {
     }
 }
 
-#[stable(feature = "default_iters", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "default_iters_sequel", since = "CURRENT_RUSTC_VERSION")]
 impl<T> Default for IterMut<'_, T> {
     /// Creates an empty `vec_deque::IterMut`.
     ///