mark internal inplace_iteration traits as hidden

Author: the8472

library/alloc/src/collections/binary_heap.rs

@@ -1299,6 +1299,7 @@ impl<T> ExactSizeIterator for IntoIter<T> {
 impl<T> FusedIterator for IntoIter<T> {}
 
 #[unstable(issue = "none", feature = "inplace_iteration")]
+#[doc(hidden)]
 unsafe impl<T> SourceIter for IntoIter<T> {
     type Source = IntoIter<T>;
 
@@ -1309,6 +1310,7 @@ unsafe impl<T> SourceIter for IntoIter<T> {
 }
 
 #[unstable(issue = "none", feature = "inplace_iteration")]
+#[doc(hidden)]
 unsafe impl<I> InPlaceIterable for IntoIter<I> {}
 
 impl<I> AsIntoIter for IntoIter<I> {

library/alloc/src/vec/into_iter.rs

@@ -264,9 +264,11 @@ unsafe impl<#[may_dangle] T, A: Allocator> Drop for IntoIter<T, A> {
 }
 
 #[unstable(issue = "none", feature = "inplace_iteration")]
+#[doc(hidden)]
 unsafe impl<T, A: Allocator> InPlaceIterable for IntoIter<T, A> {}
 
 #[unstable(issue = "none", feature = "inplace_iteration")]
+#[doc(hidden)]
 unsafe impl<T, A: Allocator> SourceIter for IntoIter<T, A> {
     type Source = Self;
 

library/core/src/iter/adapters/mod.rs

@@ -88,6 +88,7 @@ pub use self::zip::zip;
 /// [`FromIterator`]: crate::iter::FromIterator
 /// [`as_inner`]: SourceIter::as_inner
 #[unstable(issue = "none", feature = "inplace_iteration")]
+#[doc(hidden)]
 pub unsafe trait SourceIter {
     /// A source stage in an iterator pipeline.
     type Source: Iterator;

library/core/src/iter/traits/marker.rs

@@ -53,4 +53,5 @@ unsafe impl<I: TrustedLen + ?Sized> TrustedLen for &mut I {}
 /// [`next()`]: Iterator::next
 /// [`try_fold()`]: Iterator::try_fold
 #[unstable(issue = "none", feature = "inplace_iteration")]
+#[doc(hidden)]
 pub unsafe trait InPlaceIterable: Iterator {}