13 files changed, 13 insertions, 0 deletions
diff --git a/library/alloc/src/collections/binary_heap.rs b/library/alloc/src/collections/binary_heap.rs
index 97ebc12175f..76051d9e1df 100644
--- a/library/alloc/src/collections/binary_heap.rs
+++ b/library/alloc/src/collections/binary_heap.rs
@@ -915,6 +915,7 @@ impl<T> BinaryHeap<T> {
     ///
     /// assert_eq!(heap.len(), 2);
     /// ```
+    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
         self.data.len()
diff --git a/library/alloc/src/collections/btree/map.rs b/library/alloc/src/collections/btree/map.rs
index 735213363f6..944e0e65cf7 100644
--- a/library/alloc/src/collections/btree/map.rs
+++ b/library/alloc/src/collections/btree/map.rs
@@ -2132,6 +2132,7 @@ impl<K, V> BTreeMap<K, V> {
     /// a.insert(1, "a");
     /// assert_eq!(a.len(), 1);
     /// ```
+    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_unstable(feature = "const_btree_new", issue = "71835")]
     pub const fn len(&self) -> usize {
diff --git a/library/alloc/src/collections/btree/set.rs b/library/alloc/src/collections/btree/set.rs
index f63c3dd5804..c72e305a1f9 100644
--- a/library/alloc/src/collections/btree/set.rs
+++ b/library/alloc/src/collections/btree/set.rs
@@ -975,6 +975,7 @@ impl<T> BTreeSet<T> {
     /// v.insert(1);
     /// assert_eq!(v.len(), 1);
     /// ```
+    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_unstable(feature = "const_btree_new", issue = "71835")]
     pub const fn len(&self) -> usize {
diff --git a/library/alloc/src/collections/linked_list.rs b/library/alloc/src/collections/linked_list.rs
index 4707f129401..397e774f1a0 100644
--- a/library/alloc/src/collections/linked_list.rs
+++ b/library/alloc/src/collections/linked_list.rs
@@ -593,6 +593,7 @@ impl<T> LinkedList<T> {
     /// dl.push_back(3);
     /// assert_eq!(dl.len(), 3);
     /// ```
+    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
diff --git a/library/alloc/src/collections/vec_deque/mod.rs b/library/alloc/src/collections/vec_deque/mod.rs
index 7cf4041f292..42a1a08c6fc 100644
--- a/library/alloc/src/collections/vec_deque/mod.rs
+++ b/library/alloc/src/collections/vec_deque/mod.rs
@@ -1038,6 +1038,7 @@ impl<T> VecDeque<T> {
     /// v.push_back(1);
     /// assert_eq!(v.len(), 1);
     /// ```
+    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
         count(self.tail, self.head, self.cap())
diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs
index 27b32b69502..91988928593 100644
--- a/library/alloc/src/string.rs
+++ b/library/alloc/src/string.rs
@@ -1388,6 +1388,7 @@ impl String {
     /// assert_eq!(fancy_f.len(), 4);
     /// assert_eq!(fancy_f.chars().count(), 3);
     /// ```
+    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
diff --git a/library/alloc/src/vec.rs b/library/alloc/src/vec.rs
index 2b08f1f3629..c9fa41138cd 100644
--- a/library/alloc/src/vec.rs
+++ b/library/alloc/src/vec.rs
@@ -1559,6 +1559,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// let a = vec![1, 2, 3];
     /// assert_eq!(a.len(), 3);
     /// ```
+    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
diff --git a/library/core/src/iter/traits/exact_size.rs b/library/core/src/iter/traits/exact_size.rs
index eadbdf45c7c..996d62e2b4a 100644
--- a/library/core/src/iter/traits/exact_size.rs
+++ b/library/core/src/iter/traits/exact_size.rs
@@ -91,6 +91,7 @@ pub trait ExactSizeIterator: Iterator {
     ///
     /// assert_eq!(5, five.len());
     /// ```
+    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     fn len(&self) -> usize {
diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index f5af48e0dd2..bb1014332a1 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -84,6 +84,7 @@ impl<T> [T] {
     /// let a = [1, 2, 3];
     /// assert_eq!(a.len(), 3);
     /// ```
+    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_stable(feature = "const_slice_len", since = "1.32.0")]
     #[inline]
diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs
index 83cf47c8c8f..ba495a1a9fb 100644
--- a/library/core/src/str/mod.rs
+++ b/library/core/src/str/mod.rs
@@ -138,6 +138,7 @@ impl str {
     /// assert_eq!("ƒoo".len(), 4); // fancy f!
     /// assert_eq!("ƒoo".chars().count(), 3);
     /// ```
+    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_stable(feature = "const_str_len", since = "1.32.0")]
     #[inline]
diff --git a/library/std/src/collections/hash/map.rs b/library/std/src/collections/hash/map.rs
index 4f24a8bb75a..0680b1fc329 100644
--- a/library/std/src/collections/hash/map.rs
+++ b/library/std/src/collections/hash/map.rs
@@ -448,6 +448,7 @@ impl<K, V, S> HashMap<K, V, S> {
     /// a.insert(1, "a");
     /// assert_eq!(a.len(), 1);
     /// ```
+    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
         self.base.len()
diff --git a/library/std/src/collections/hash/set.rs b/library/std/src/collections/hash/set.rs
index 27093c1a077..f49e5801c35 100644
--- a/library/std/src/collections/hash/set.rs
+++ b/library/std/src/collections/hash/set.rs
@@ -199,6 +199,7 @@ impl<T, S> HashSet<T, S> {
     /// v.insert(1);
     /// assert_eq!(v.len(), 1);
     /// ```
+    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
diff --git a/library/std/src/ffi/os_str.rs b/library/std/src/ffi/os_str.rs
index 5d93016cadb..2eef4d58507 100644
--- a/library/std/src/ffi/os_str.rs
+++ b/library/std/src/ffi/os_str.rs
@@ -653,6 +653,7 @@ impl OsStr {
     /// let os_str = OsStr::new("foo");
     /// assert_eq!(os_str.len(), 3);
     /// ```
+    #[doc(alias = "length")]
     #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
     pub fn len(&self) -> usize {
         self.inner.inner.len()