diff --git a/include/__split_buffer b/include/__split_buffer
index dbf3ce01..d5b8f0a3 100644
--- a/include/__split_buffer
+++ b/include/__split_buffer
@@ -141,14 +141,14 @@ public:
 
 private:
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const __split_buffer& __c, true_type)
+    void __move_assign_alloc(__split_buffer& __c, true_type)
         _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
         {
             __alloc() = _VSTD::move(__c.__alloc());
         }
 
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const __split_buffer& __c, false_type) _NOEXCEPT
+    void __move_assign_alloc(__split_buffer& __c, false_type) _NOEXCEPT
         {}
 
     _LIBCPP_INLINE_VISIBILITY
diff --git a/include/deque b/include/deque
index 69682a16..87cbe599 100644
--- a/include/deque
+++ b/include/deque
@@ -977,14 +977,14 @@ protected:
 
 private:
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const __deque_base& __c, true_type)
+    void __move_assign_alloc(__deque_base& __c, true_type)
         _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
         {
             __alloc() = _VSTD::move(__c.__alloc());
         }
 
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const __deque_base& __c, false_type) _NOEXCEPT
+    void __move_assign_alloc(__deque_base& __c, false_type) _NOEXCEPT
         {}
 
     _LIBCPP_INLINE_VISIBILITY
diff --git a/include/list b/include/list
index fa515e0b..900e2ec9 100644
--- a/include/list
+++ b/include/list
@@ -444,14 +444,14 @@ private:
         {}
 
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const __list_imp& __c, true_type)
+    void __move_assign_alloc(__list_imp& __c, true_type)
         _NOEXCEPT_(is_nothrow_move_assignable<__node_allocator>::value)
         {
             __node_alloc() = _VSTD::move(__c.__node_alloc());
         }
 
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const __list_imp& __c, false_type)
+    void __move_assign_alloc(__list_imp& __c, false_type)
         _NOEXCEPT
         {}
 };
diff --git a/include/string b/include/string
index a1dba310..2041510f 100644
--- a/include/string
+++ b/include/string
@@ -1593,7 +1593,7 @@ private:
 
     _LIBCPP_INLINE_VISIBILITY
     void
-    __move_assign_alloc(const basic_string& __str)
+    __move_assign_alloc(basic_string& __str)
         _NOEXCEPT_(
             !__alloc_traits::propagate_on_container_move_assignment::value ||
             is_nothrow_move_assignable<allocator_type>::value)
@@ -1601,14 +1601,14 @@ private:
                       __alloc_traits::propagate_on_container_move_assignment::value>());}
 
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const basic_string& __c, true_type)
+    void __move_assign_alloc(basic_string& __c, true_type)
         _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
         {
             __alloc() = _VSTD::move(__c.__alloc());
         }
 
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const basic_string& __c, false_type)
+    void __move_assign_alloc(basic_string& __c, false_type)
         _NOEXCEPT
         {}
 
diff --git a/include/vector b/include/vector
index 43a67d8f..348fe4af 100644
--- a/include/vector
+++ b/include/vector
@@ -160,7 +160,7 @@ public:
 
     vector()
         noexcept(is_nothrow_default_constructible<allocator_type>::value);
-    explicit vector(const allocator_type& = allocator_type());
+    explicit vector(const allocator_type&);
     explicit vector(size_type n, const value_type& value = value_type(), const allocator_type& = allocator_type());
     template <class InputIterator>
         vector(InputIterator first, InputIterator last, const allocator_type& = allocator_type());
@@ -402,14 +402,14 @@ private:
         {}
 
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const __vector_base& __c, true_type)
+    void __move_assign_alloc(__vector_base& __c, true_type)
         _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
         {
             __alloc() = _VSTD::move(__c.__alloc());
         }
 
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const __vector_base& __c, false_type)
+    void __move_assign_alloc(__vector_base& __c, false_type)
         _NOEXCEPT
         {}
 
@@ -2087,14 +2087,14 @@ private:
         {__move_assign_alloc(__c, integral_constant<bool,
                       __storage_traits::propagate_on_container_move_assignment::value>());}
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const vector& __c, true_type)
+    void __move_assign_alloc(vector& __c, true_type)
         _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
         {
             __alloc() = _VSTD::move(__c.__alloc());
         }
 
     _LIBCPP_INLINE_VISIBILITY
-    void __move_assign_alloc(const vector& __c, false_type)
+    void __move_assign_alloc(vector& __c, false_type)
         _NOEXCEPT
         {}