diff --git a/libcxx/include/map b/libcxx/include/map
index 4dfce70e50e7f..4bc7e2022f04c 100644
--- a/libcxx/include/map
+++ b/libcxx/include/map
@@ -978,11 +978,11 @@ public:
 
 #  ifndef _LIBCPP_CXX03_LANG
 
-  _LIBCPP_HIDE_FROM_ABI map(map&& __m) noexcept(is_nothrow_move_constructible<__base>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI map(map&& __m) = default;
 
   _LIBCPP_HIDE_FROM_ABI map(map&& __m, const allocator_type& __a);
 
-  _LIBCPP_HIDE_FROM_ABI map& operator=(map&& __m) noexcept(is_nothrow_move_assignable<__base>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI map& operator=(map&& __m) = default;
 
   _LIBCPP_HIDE_FROM_ABI map(initializer_list<value_type> __il, const key_compare& __comp = key_compare())
       : __tree_(__vc(__comp)) {
@@ -1646,12 +1646,11 @@ public:
 
 #  ifndef _LIBCPP_CXX03_LANG
 
-  _LIBCPP_HIDE_FROM_ABI multimap(multimap&& __m) noexcept(is_nothrow_move_constructible<__base>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI multimap(multimap&& __m) = default;
 
   _LIBCPP_HIDE_FROM_ABI multimap(multimap&& __m, const allocator_type& __a);
 
-  _LIBCPP_HIDE_FROM_ABI multimap&
-  operator=(multimap&& __m) noexcept(is_nothrow_move_assignable<__base>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI multimap& operator=(multimap&& __m) = default;
 
   _LIBCPP_HIDE_FROM_ABI multimap(initializer_list<value_type> __il, const key_compare& __comp = key_compare())
       : __tree_(__vc(__comp)) {
diff --git a/libcxx/include/set b/libcxx/include/set
index 05c1939dbbabf..4417d2811eb23 100644
--- a/libcxx/include/set
+++ b/libcxx/include/set
@@ -667,7 +667,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI set& operator=(const set& __s) = default;
 
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI set(set&& __s) noexcept(is_nothrow_move_constructible<__base>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI set(set&& __s) = default;
 #  endif // _LIBCPP_CXX03_LANG
 
   _LIBCPP_HIDE_FROM_ABI explicit set(const allocator_type& __a) : __tree_(__a) {}
@@ -699,10 +699,7 @@ public:
     return *this;
   }
 
-  _LIBCPP_HIDE_FROM_ABI set& operator=(set&& __s) noexcept(is_nothrow_move_assignable<__base>::value) {
-    __tree_ = std::move(__s.__tree_);
-    return *this;
-  }
+  _LIBCPP_HIDE_FROM_ABI set& operator=(set&& __s) = default;
 #  endif // _LIBCPP_CXX03_LANG
 
   _LIBCPP_HIDE_FROM_ABI ~set() { static_assert(sizeof(std::__diagnose_non_const_comparator<_Key, _Compare>()), ""); }
@@ -1126,7 +1123,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI multiset& operator=(const multiset& __s) = default;
 
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI multiset(multiset&& __s) noexcept(is_nothrow_move_constructible<__base>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI multiset(multiset&& __s) = default;
 
   _LIBCPP_HIDE_FROM_ABI multiset(multiset&& __s, const allocator_type& __a);
 #  endif // _LIBCPP_CXX03_LANG
@@ -1158,10 +1155,7 @@ public:
     return *this;
   }
 
-  _LIBCPP_HIDE_FROM_ABI multiset& operator=(multiset&& __s) _NOEXCEPT_(is_nothrow_move_assignable<__base>::value) {
-    __tree_ = std::move(__s.__tree_);
-    return *this;
-  }
+  _LIBCPP_HIDE_FROM_ABI multiset& operator=(multiset&& __s) = default;
 #  endif // _LIBCPP_CXX03_LANG
 
   _LIBCPP_HIDE_FROM_ABI ~multiset() {
diff --git a/libcxx/include/unordered_map b/libcxx/include/unordered_map
index 104dc56a89fea..a934953674967 100644
--- a/libcxx/include/unordered_map
+++ b/libcxx/include/unordered_map
@@ -1049,8 +1049,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI unordered_map(const unordered_map& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_map(const unordered_map& __u, const allocator_type& __a);
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI unordered_map(unordered_map&& __u)
-      _NOEXCEPT_(is_nothrow_move_constructible<__table>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI unordered_map(unordered_map&& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_map(unordered_map&& __u, const allocator_type& __a);
   _LIBCPP_HIDE_FROM_ABI unordered_map(initializer_list<value_type> __il);
   _LIBCPP_HIDE_FROM_ABI
@@ -1102,8 +1101,7 @@ public:
 
   _LIBCPP_HIDE_FROM_ABI unordered_map& operator=(const unordered_map& __u) = default;
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI unordered_map& operator=(unordered_map&& __u)
-      _NOEXCEPT_(is_nothrow_move_assignable<__table>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI unordered_map& operator=(unordered_map&& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_map& operator=(initializer_list<value_type> __il);
 #  endif // _LIBCPP_CXX03_LANG
 
@@ -1823,8 +1821,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI unordered_multimap(const unordered_multimap& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_multimap(const unordered_multimap& __u, const allocator_type& __a);
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI unordered_multimap(unordered_multimap&& __u)
-      _NOEXCEPT_(is_nothrow_move_constructible<__table>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI unordered_multimap(unordered_multimap&& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_multimap(unordered_multimap&& __u, const allocator_type& __a);
   _LIBCPP_HIDE_FROM_ABI unordered_multimap(initializer_list<value_type> __il);
   _LIBCPP_HIDE_FROM_ABI unordered_multimap(
@@ -1876,8 +1873,7 @@ public:
 
   _LIBCPP_HIDE_FROM_ABI unordered_multimap& operator=(const unordered_multimap& __u) = default;
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI unordered_multimap& operator=(unordered_multimap&& __u)
-      _NOEXCEPT_(is_nothrow_move_assignable<__table>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI unordered_multimap& operator=(unordered_multimap&& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_multimap& operator=(initializer_list<value_type> __il);
 #  endif // _LIBCPP_CXX03_LANG
 
diff --git a/libcxx/include/unordered_set b/libcxx/include/unordered_set
index 09bd81a22eae5..4bc9c1afa2639 100644
--- a/libcxx/include/unordered_set
+++ b/libcxx/include/unordered_set
@@ -706,7 +706,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI unordered_set(const unordered_set& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_set(const unordered_set& __u, const allocator_type& __a);
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI unordered_set(unordered_set&& __u) _NOEXCEPT_(is_nothrow_move_constructible<__table>::value);
+  _LIBCPP_HIDE_FROM_ABI unordered_set(unordered_set&& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_set(unordered_set&& __u, const allocator_type& __a);
   _LIBCPP_HIDE_FROM_ABI unordered_set(initializer_list<value_type> __il);
   _LIBCPP_HIDE_FROM_ABI
@@ -735,8 +735,7 @@ public:
 
   _LIBCPP_HIDE_FROM_ABI unordered_set& operator=(const unordered_set& __u) = default;
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI unordered_set& operator=(unordered_set&& __u)
-      _NOEXCEPT_(is_nothrow_move_assignable<__table>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI unordered_set& operator=(unordered_set&& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_set& operator=(initializer_list<value_type> __il);
 #  endif // _LIBCPP_CXX03_LANG
 
@@ -1076,11 +1075,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(const unordered_set&
 
 #  ifndef _LIBCPP_CXX03_LANG
 
-template <class _Value, class _Hash, class _Pred, class _Alloc>
-inline unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(unordered_set&& __u)
-    _NOEXCEPT_(is_nothrow_move_constructible<__table>::value)
-    : __table_(std::move(__u.__table_)) {}
-
 template <class _Value, class _Hash, class _Pred, class _Alloc>
 unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(unordered_set&& __u, const allocator_type& __a)
     : __table_(std::move(__u.__table_), __a) {
@@ -1294,8 +1288,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI unordered_multiset(const unordered_multiset& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_multiset(const unordered_multiset& __u, const allocator_type& __a);
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI unordered_multiset(unordered_multiset&& __u)
-      _NOEXCEPT_(is_nothrow_move_constructible<__table>::value);
+  _LIBCPP_HIDE_FROM_ABI unordered_multiset(unordered_multiset&& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_multiset(unordered_multiset&& __u, const allocator_type& __a);
   _LIBCPP_HIDE_FROM_ABI unordered_multiset(initializer_list<value_type> __il);
   _LIBCPP_HIDE_FROM_ABI unordered_multiset(
@@ -1324,8 +1317,7 @@ public:
 
   _LIBCPP_HIDE_FROM_ABI unordered_multiset& operator=(const unordered_multiset& __u) = default;
 #  ifndef _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI unordered_multiset& operator=(unordered_multiset&& __u)
-      _NOEXCEPT_(is_nothrow_move_assignable<__table>::value) = default;
+  _LIBCPP_HIDE_FROM_ABI unordered_multiset& operator=(unordered_multiset&& __u) = default;
   _LIBCPP_HIDE_FROM_ABI unordered_multiset& operator=(initializer_list<value_type> __il);
 #  endif // _LIBCPP_CXX03_LANG
 
@@ -1675,11 +1667,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
 
 #  ifndef _LIBCPP_CXX03_LANG
 
-template <class _Value, class _Hash, class _Pred, class _Alloc>
-inline unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(unordered_multiset&& __u)
-    _NOEXCEPT_(is_nothrow_move_constructible<__table>::value)
-    : __table_(std::move(__u.__table_)) {}
-
 template <class _Value, class _Hash, class _Pred, class _Alloc>
 unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
     unordered_multiset&& __u, const allocator_type& __a)