diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -599,7 +599,6 @@
       -Wno-user-defined-literals
       -Wno-covered-switch-default
       -Wno-suggest-override
-      -Wno-ignored-attributes # FIXME: Caused by _LIBCPP_NODEBUG_TYPE not being supported on older clangs
     )
     if (LIBCXX_TARGETING_CLANG_CL)
       target_add_compile_flags_if_supported(${target} PRIVATE
diff --git a/libcxx/include/__config b/libcxx/include/__config
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -1289,12 +1289,6 @@
 #define _LIBCPP_NODEBUG
 #endif
 
-#if __has_attribute(__nodebug__) && (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 900)
-#   define _LIBCPP_NODEBUG_TYPE __attribute__((nodebug))
-#else
-#   define _LIBCPP_NODEBUG_TYPE
-#endif
-
 #if __has_attribute(__standalone_debug__)
 #define _LIBCPP_STANDALONE_DEBUG __attribute__((__standalone_debug__))
 #else
diff --git a/libcxx/include/__functional/function.h b/libcxx/include/__functional/function.h
--- a/libcxx/include/__functional/function.h
+++ b/libcxx/include/__functional/function.h
@@ -127,8 +127,8 @@
     __compressed_pair<_Fp, _Ap> __f_;
 
   public:
-    typedef _LIBCPP_NODEBUG_TYPE _Fp _Target;
-    typedef _LIBCPP_NODEBUG_TYPE _Ap _Alloc;
+    typedef _LIBCPP_NODEBUG _Fp _Target;
+    typedef _LIBCPP_NODEBUG _Ap _Alloc;
 
     _LIBCPP_INLINE_VISIBILITY
     const _Target& __target() const { return __f_.first(); }
@@ -205,7 +205,7 @@
   _Fp __f_;
 
 public:
-  typedef _LIBCPP_NODEBUG_TYPE _Fp _Target;
+  typedef _LIBCPP_NODEBUG _Fp _Target;
 
   _LIBCPP_INLINE_VISIBILITY
   const _Target& __target() const { return __f_; }
diff --git a/libcxx/include/__functional/hash.h b/libcxx/include/__functional/hash.h
--- a/libcxx/include/__functional/hash.h
+++ b/libcxx/include/__functional/hash.h
@@ -836,29 +836,29 @@
 
 #ifndef _LIBCPP_CXX03_LANG
 template <class _Key, class _Hash>
-using __check_hash_requirements _LIBCPP_NODEBUG_TYPE  = integral_constant<bool,
+using __check_hash_requirements _LIBCPP_NODEBUG  = integral_constant<bool,
     is_copy_constructible<_Hash>::value &&
     is_move_constructible<_Hash>::value &&
     __invokable_r<size_t, _Hash, _Key const&>::value
 >;
 
 template <class _Key, class _Hash = hash<_Key> >
-using __has_enabled_hash _LIBCPP_NODEBUG_TYPE = integral_constant<bool,
+using __has_enabled_hash _LIBCPP_NODEBUG = integral_constant<bool,
     __check_hash_requirements<_Key, _Hash>::value &&
     is_default_constructible<_Hash>::value
 >;
 
 #if _LIBCPP_STD_VER > 14
 template <class _Type, class>
-using __enable_hash_helper_imp _LIBCPP_NODEBUG_TYPE  = _Type;
+using __enable_hash_helper_imp _LIBCPP_NODEBUG  = _Type;
 
 template <class _Type, class ..._Keys>
-using __enable_hash_helper _LIBCPP_NODEBUG_TYPE  = __enable_hash_helper_imp<_Type,
+using __enable_hash_helper _LIBCPP_NODEBUG  = __enable_hash_helper_imp<_Type,
   typename enable_if<__all<__has_enabled_hash<_Keys>::value...>::value>::type
 >;
 #else
 template <class _Type, class ...>
-using __enable_hash_helper _LIBCPP_NODEBUG_TYPE = _Type;
+using __enable_hash_helper _LIBCPP_NODEBUG = _Type;
 #endif
 
 #endif // !_LIBCPP_CXX03_LANG
diff --git a/libcxx/include/__functional/unwrap_ref.h b/libcxx/include/__functional/unwrap_ref.h
--- a/libcxx/include/__functional/unwrap_ref.h
+++ b/libcxx/include/__functional/unwrap_ref.h
@@ -18,13 +18,13 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _Tp>
-struct __unwrap_reference { typedef _LIBCPP_NODEBUG_TYPE _Tp type; };
+struct __unwrap_reference { typedef _LIBCPP_NODEBUG _Tp type; };
 
 template <class _Tp>
 class reference_wrapper;
 
 template <class _Tp>
-struct __unwrap_reference<reference_wrapper<_Tp> > { typedef _LIBCPP_NODEBUG_TYPE _Tp& type; };
+struct __unwrap_reference<reference_wrapper<_Tp> > { typedef _LIBCPP_NODEBUG _Tp& type; };
 
 template <class _Tp>
 struct decay;
diff --git a/libcxx/include/__functional/weak_result_type.h b/libcxx/include/__functional/weak_result_type.h
--- a/libcxx/include/__functional/weak_result_type.h
+++ b/libcxx/include/__functional/weak_result_type.h
@@ -89,7 +89,7 @@
     : public __maybe_derive_from_unary_function<_Tp>,
       public __maybe_derive_from_binary_function<_Tp>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename _Tp::result_type result_type;
+    typedef _LIBCPP_NODEBUG typename _Tp::result_type result_type;
 };
 
 template <class _Tp>
@@ -110,19 +110,19 @@
 template <class _Rp>
 struct __weak_result_type<_Rp ()>
 {
-    typedef _LIBCPP_NODEBUG_TYPE  _Rp result_type;
+    typedef _LIBCPP_NODEBUG  _Rp result_type;
 };
 
 template <class _Rp>
 struct __weak_result_type<_Rp (&)()>
 {
-    typedef _LIBCPP_NODEBUG_TYPE  _Rp result_type;
+    typedef _LIBCPP_NODEBUG  _Rp result_type;
 };
 
 template <class _Rp>
 struct __weak_result_type<_Rp (*)()>
 {
-    typedef _LIBCPP_NODEBUG_TYPE  _Rp result_type;
+    typedef _LIBCPP_NODEBUG  _Rp result_type;
 };
 
 // 1 argument case
diff --git a/libcxx/include/__memory/allocator_arg_t.h b/libcxx/include/__memory/allocator_arg_t.h
--- a/libcxx/include/__memory/allocator_arg_t.h
+++ b/libcxx/include/__memory/allocator_arg_t.h
@@ -36,7 +36,7 @@
 template <class _Tp, class _Alloc, class ..._Args>
 struct __uses_alloc_ctor_imp
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename __uncvref<_Alloc>::type _RawAlloc;
+    typedef _LIBCPP_NODEBUG typename __uncvref<_Alloc>::type _RawAlloc;
     static const bool __ua = uses_allocator<_Tp, _RawAlloc>::value;
     static const bool __ic =
         is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value;
diff --git a/libcxx/include/__memory/allocator_traits.h b/libcxx/include/__memory/allocator_traits.h
--- a/libcxx/include/__memory/allocator_traits.h
+++ b/libcxx/include/__memory/allocator_traits.h
@@ -36,11 +36,11 @@
           class _RawAlloc = typename remove_reference<_Alloc>::type,
           bool = __has_pointer<_RawAlloc>::value>
 struct __pointer {
-    using type _LIBCPP_NODEBUG_TYPE = typename _RawAlloc::pointer;
+    using type _LIBCPP_NODEBUG = typename _RawAlloc::pointer;
 };
 template <class _Tp, class _Alloc, class _RawAlloc>
 struct __pointer<_Tp, _Alloc, _RawAlloc, false> {
-    using type _LIBCPP_NODEBUG_TYPE = _Tp*;
+    using type _LIBCPP_NODEBUG = _Tp*;
 };
 
 // __const_pointer
@@ -48,14 +48,14 @@
 template <class _Tp, class _Ptr, class _Alloc,
           bool = __has_const_pointer<_Alloc>::value>
 struct __const_pointer {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc::const_pointer;
+    using type _LIBCPP_NODEBUG = typename _Alloc::const_pointer;
 };
 template <class _Tp, class _Ptr, class _Alloc>
 struct __const_pointer<_Tp, _Ptr, _Alloc, false> {
 #ifdef _LIBCPP_CXX03_LANG
     using type = typename pointer_traits<_Ptr>::template rebind<const _Tp>::other;
 #else
-    using type _LIBCPP_NODEBUG_TYPE = typename pointer_traits<_Ptr>::template rebind<const _Tp>;
+    using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<const _Tp>;
 #endif
 };
 
@@ -64,14 +64,14 @@
 template <class _Ptr, class _Alloc,
           bool = __has_void_pointer<_Alloc>::value>
 struct __void_pointer {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc::void_pointer;
+    using type _LIBCPP_NODEBUG = typename _Alloc::void_pointer;
 };
 template <class _Ptr, class _Alloc>
 struct __void_pointer<_Ptr, _Alloc, false> {
 #ifdef _LIBCPP_CXX03_LANG
-    using type _LIBCPP_NODEBUG_TYPE = typename pointer_traits<_Ptr>::template rebind<void>::other;
+    using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<void>::other;
 #else
-    using type _LIBCPP_NODEBUG_TYPE = typename pointer_traits<_Ptr>::template rebind<void>;
+    using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<void>;
 #endif
 };
 
@@ -80,14 +80,14 @@
 template <class _Ptr, class _Alloc,
           bool = __has_const_void_pointer<_Alloc>::value>
 struct __const_void_pointer {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc::const_void_pointer;
+    using type _LIBCPP_NODEBUG = typename _Alloc::const_void_pointer;
 };
 template <class _Ptr, class _Alloc>
 struct __const_void_pointer<_Ptr, _Alloc, false> {
 #ifdef _LIBCPP_CXX03_LANG
-    using type _LIBCPP_NODEBUG_TYPE = typename pointer_traits<_Ptr>::template rebind<const void>::other;
+    using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<const void>::other;
 #else
-    using type _LIBCPP_NODEBUG_TYPE = typename pointer_traits<_Ptr>::template rebind<const void>;
+    using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<const void>;
 #endif
 };
 
@@ -97,18 +97,18 @@
 struct __size_type : make_unsigned<_DiffType> { };
 template <class _Alloc, class _DiffType>
 struct __size_type<_Alloc, _DiffType, true> {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc::size_type;
+    using type _LIBCPP_NODEBUG = typename _Alloc::size_type;
 };
 
 // __alloc_traits_difference_type
 _LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_alloc_traits_difference_type, difference_type);
 template <class _Alloc, class _Ptr, bool = __has_alloc_traits_difference_type<_Alloc>::value>
 struct __alloc_traits_difference_type {
-    using type _LIBCPP_NODEBUG_TYPE = typename pointer_traits<_Ptr>::difference_type;
+    using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::difference_type;
 };
 template <class _Alloc, class _Ptr>
 struct __alloc_traits_difference_type<_Alloc, _Ptr, true> {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc::difference_type;
+    using type _LIBCPP_NODEBUG = typename _Alloc::difference_type;
 };
 
 // __propagate_on_container_copy_assignment
@@ -117,7 +117,7 @@
 struct __propagate_on_container_copy_assignment : false_type { };
 template <class _Alloc>
 struct __propagate_on_container_copy_assignment<_Alloc, true> {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc::propagate_on_container_copy_assignment;
+    using type _LIBCPP_NODEBUG = typename _Alloc::propagate_on_container_copy_assignment;
 };
 
 // __propagate_on_container_move_assignment
@@ -126,7 +126,7 @@
 struct __propagate_on_container_move_assignment : false_type { };
 template <class _Alloc>
 struct __propagate_on_container_move_assignment<_Alloc, true> {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc::propagate_on_container_move_assignment;
+    using type _LIBCPP_NODEBUG = typename _Alloc::propagate_on_container_move_assignment;
 };
 
 // __propagate_on_container_swap
@@ -135,7 +135,7 @@
 struct __propagate_on_container_swap : false_type { };
 template <class _Alloc>
 struct __propagate_on_container_swap<_Alloc, true> {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc::propagate_on_container_swap;
+    using type _LIBCPP_NODEBUG = typename _Alloc::propagate_on_container_swap;
 };
 
 // __is_always_equal
@@ -144,7 +144,7 @@
 struct __is_always_equal : is_empty<_Alloc> { };
 template <class _Alloc>
 struct __is_always_equal<_Alloc, true> {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc::is_always_equal;
+    using type _LIBCPP_NODEBUG = typename _Alloc::is_always_equal;
 };
 
 // __allocator_traits_rebind
@@ -158,15 +158,15 @@
 
 template <class _Tp, class _Up, bool = __has_rebind_other<_Tp, _Up>::value>
 struct __allocator_traits_rebind {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Tp::template rebind<_Up>::other;
+    using type _LIBCPP_NODEBUG = typename _Tp::template rebind<_Up>::other;
 };
 template <template <class, class...> class _Alloc, class _Tp, class ..._Args, class _Up>
 struct __allocator_traits_rebind<_Alloc<_Tp, _Args...>, _Up, true> {
-    using type _LIBCPP_NODEBUG_TYPE = typename _Alloc<_Tp, _Args...>::template rebind<_Up>::other;
+    using type _LIBCPP_NODEBUG = typename _Alloc<_Tp, _Args...>::template rebind<_Up>::other;
 };
 template <template <class, class...> class _Alloc, class _Tp, class ..._Args, class _Up>
 struct __allocator_traits_rebind<_Alloc<_Tp, _Args...>, _Up, false> {
-    using type _LIBCPP_NODEBUG_TYPE = _Alloc<_Up, _Args...>;
+    using type _LIBCPP_NODEBUG = _Alloc<_Up, _Args...>;
 };
 _LIBCPP_SUPPRESS_DEPRECATED_POP
 
@@ -352,7 +352,7 @@
 template <class _Traits, class _Tp>
 struct __rebind_alloc_helper {
 #ifndef _LIBCPP_CXX03_LANG
-    using type _LIBCPP_NODEBUG_TYPE = typename _Traits::template rebind_alloc<_Tp>;
+    using type _LIBCPP_NODEBUG = typename _Traits::template rebind_alloc<_Tp>;
 #else
     using type = typename _Traits::template rebind_alloc<_Tp>::other;
 #endif
diff --git a/libcxx/include/__memory/compressed_pair.h b/libcxx/include/__memory/compressed_pair.h
--- a/libcxx/include/__memory/compressed_pair.h
+++ b/libcxx/include/__memory/compressed_pair.h
@@ -115,8 +115,8 @@
     "The current implementation is NOT ABI-compatible with the previous "
     "implementation for this configuration");
 
-    typedef _LIBCPP_NODEBUG_TYPE __compressed_pair_elem<_T1, 0> _Base1;
-    typedef _LIBCPP_NODEBUG_TYPE __compressed_pair_elem<_T2, 1> _Base2;
+    typedef _LIBCPP_NODEBUG __compressed_pair_elem<_T1, 0> _Base1;
+    typedef _LIBCPP_NODEBUG __compressed_pair_elem<_T2, 1> _Base2;
 
     template <bool _Dummy = true,
       class = typename enable_if<
diff --git a/libcxx/include/__memory/pointer_traits.h b/libcxx/include/__memory/pointer_traits.h
--- a/libcxx/include/__memory/pointer_traits.h
+++ b/libcxx/include/__memory/pointer_traits.h
@@ -33,19 +33,19 @@
 template <class _Ptr>
 struct __pointer_traits_element_type<_Ptr, true>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename _Ptr::element_type type;
+    typedef _LIBCPP_NODEBUG typename _Ptr::element_type type;
 };
 
 template <template <class, class...> class _Sp, class _Tp, class ..._Args>
 struct __pointer_traits_element_type<_Sp<_Tp, _Args...>, true>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename _Sp<_Tp, _Args...>::element_type type;
+    typedef _LIBCPP_NODEBUG typename _Sp<_Tp, _Args...>::element_type type;
 };
 
 template <template <class, class...> class _Sp, class _Tp, class ..._Args>
 struct __pointer_traits_element_type<_Sp<_Tp, _Args...>, false>
 {
-    typedef _LIBCPP_NODEBUG_TYPE _Tp type;
+    typedef _LIBCPP_NODEBUG _Tp type;
 };
 
 template <class _Tp, class = void>
@@ -58,13 +58,13 @@
 template <class _Ptr, bool = __has_difference_type<_Ptr>::value>
 struct __pointer_traits_difference_type
 {
-    typedef _LIBCPP_NODEBUG_TYPE ptrdiff_t type;
+    typedef _LIBCPP_NODEBUG ptrdiff_t type;
 };
 
 template <class _Ptr>
 struct __pointer_traits_difference_type<_Ptr, true>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename _Ptr::difference_type type;
+    typedef _LIBCPP_NODEBUG typename _Ptr::difference_type type;
 };
 
 template <class _Tp, class _Up>
@@ -84,9 +84,9 @@
 struct __pointer_traits_rebind
 {
 #ifndef _LIBCPP_CXX03_LANG
-    typedef _LIBCPP_NODEBUG_TYPE typename _Tp::template rebind<_Up> type;
+    typedef _LIBCPP_NODEBUG typename _Tp::template rebind<_Up> type;
 #else
-    typedef _LIBCPP_NODEBUG_TYPE typename _Tp::template rebind<_Up>::other type;
+    typedef _LIBCPP_NODEBUG typename _Tp::template rebind<_Up>::other type;
 #endif
 };
 
@@ -94,9 +94,9 @@
 struct __pointer_traits_rebind<_Sp<_Tp, _Args...>, _Up, true>
 {
 #ifndef _LIBCPP_CXX03_LANG
-    typedef _LIBCPP_NODEBUG_TYPE typename _Sp<_Tp, _Args...>::template rebind<_Up> type;
+    typedef _LIBCPP_NODEBUG typename _Sp<_Tp, _Args...>::template rebind<_Up> type;
 #else
-    typedef _LIBCPP_NODEBUG_TYPE typename _Sp<_Tp, _Args...>::template rebind<_Up>::other type;
+    typedef _LIBCPP_NODEBUG typename _Sp<_Tp, _Args...>::template rebind<_Up>::other type;
 #endif
 };
 
diff --git a/libcxx/include/__memory/shared_ptr.h b/libcxx/include/__memory/shared_ptr.h
--- a/libcxx/include/__memory/shared_ptr.h
+++ b/libcxx/include/__memory/shared_ptr.h
@@ -48,10 +48,10 @@
 template <class _Alloc>
 class __allocator_destructor
 {
-    typedef _LIBCPP_NODEBUG_TYPE allocator_traits<_Alloc> __alloc_traits;
+    typedef _LIBCPP_NODEBUG allocator_traits<_Alloc> __alloc_traits;
 public:
-    typedef _LIBCPP_NODEBUG_TYPE typename __alloc_traits::pointer pointer;
-    typedef _LIBCPP_NODEBUG_TYPE typename __alloc_traits::size_type size_type;
+    typedef _LIBCPP_NODEBUG typename __alloc_traits::pointer pointer;
+    typedef _LIBCPP_NODEBUG typename __alloc_traits::size_type size_type;
 private:
     _Alloc& __alloc_;
     size_type __s_;
diff --git a/libcxx/include/__memory/unique_ptr.h b/libcxx/include/__memory/unique_ptr.h
--- a/libcxx/include/__memory/unique_ptr.h
+++ b/libcxx/include/__memory/unique_ptr.h
@@ -119,7 +119,7 @@
 public:
   typedef _Tp element_type;
   typedef _Dp deleter_type;
-  typedef _LIBCPP_NODEBUG_TYPE typename __pointer<_Tp, deleter_type>::type pointer;
+  typedef _LIBCPP_NODEBUG typename __pointer<_Tp, deleter_type>::type pointer;
 
   static_assert(!is_rvalue_reference<deleter_type>::value,
                 "the specified deleter type cannot be an rvalue reference");
@@ -129,38 +129,38 @@
 
   struct __nat { int __for_bool_; };
 
-  typedef _LIBCPP_NODEBUG_TYPE __unique_ptr_deleter_sfinae<_Dp> _DeleterSFINAE;
+  typedef _LIBCPP_NODEBUG __unique_ptr_deleter_sfinae<_Dp> _DeleterSFINAE;
 
   template <bool _Dummy>
-  using _LValRefType _LIBCPP_NODEBUG_TYPE =
+  using _LValRefType _LIBCPP_NODEBUG =
       typename __dependent_type<_DeleterSFINAE, _Dummy>::__lval_ref_type;
 
   template <bool _Dummy>
-  using _GoodRValRefType _LIBCPP_NODEBUG_TYPE =
+  using _GoodRValRefType _LIBCPP_NODEBUG =
       typename __dependent_type<_DeleterSFINAE, _Dummy>::__good_rval_ref_type;
 
   template <bool _Dummy>
-  using _BadRValRefType _LIBCPP_NODEBUG_TYPE  =
+  using _BadRValRefType _LIBCPP_NODEBUG  =
       typename __dependent_type<_DeleterSFINAE, _Dummy>::__bad_rval_ref_type;
 
   template <bool _Dummy, class _Deleter = typename __dependent_type<
                              __identity<deleter_type>, _Dummy>::type>
-  using _EnableIfDeleterDefaultConstructible _LIBCPP_NODEBUG_TYPE =
+  using _EnableIfDeleterDefaultConstructible _LIBCPP_NODEBUG =
       typename enable_if<is_default_constructible<_Deleter>::value &&
                          !is_pointer<_Deleter>::value>::type;
 
   template <class _ArgType>
-  using _EnableIfDeleterConstructible _LIBCPP_NODEBUG_TYPE  =
+  using _EnableIfDeleterConstructible _LIBCPP_NODEBUG  =
       typename enable_if<is_constructible<deleter_type, _ArgType>::value>::type;
 
   template <class _UPtr, class _Up>
-  using _EnableIfMoveConvertible _LIBCPP_NODEBUG_TYPE  = typename enable_if<
+  using _EnableIfMoveConvertible _LIBCPP_NODEBUG  = typename enable_if<
       is_convertible<typename _UPtr::pointer, pointer>::value &&
       !is_array<_Up>::value
   >::type;
 
   template <class _UDel>
-  using _EnableIfDeleterConvertible _LIBCPP_NODEBUG_TYPE  = typename enable_if<
+  using _EnableIfDeleterConvertible _LIBCPP_NODEBUG  = typename enable_if<
       (is_reference<_Dp>::value && is_same<_Dp, _UDel>::value) ||
       (!is_reference<_Dp>::value && is_convertible<_UDel, _Dp>::value)
     >::type;
@@ -347,35 +347,35 @@
   typedef __unique_ptr_deleter_sfinae<_Dp> _DeleterSFINAE;
 
   template <bool _Dummy>
-  using _LValRefType _LIBCPP_NODEBUG_TYPE =
+  using _LValRefType _LIBCPP_NODEBUG =
       typename __dependent_type<_DeleterSFINAE, _Dummy>::__lval_ref_type;
 
   template <bool _Dummy>
-  using _GoodRValRefType _LIBCPP_NODEBUG_TYPE =
+  using _GoodRValRefType _LIBCPP_NODEBUG =
       typename __dependent_type<_DeleterSFINAE, _Dummy>::__good_rval_ref_type;
 
   template <bool _Dummy>
-  using _BadRValRefType _LIBCPP_NODEBUG_TYPE =
+  using _BadRValRefType _LIBCPP_NODEBUG =
       typename __dependent_type<_DeleterSFINAE, _Dummy>::__bad_rval_ref_type;
 
   template <bool _Dummy, class _Deleter = typename __dependent_type<
                              __identity<deleter_type>, _Dummy>::type>
-  using _EnableIfDeleterDefaultConstructible _LIBCPP_NODEBUG_TYPE  =
+  using _EnableIfDeleterDefaultConstructible _LIBCPP_NODEBUG  =
       typename enable_if<is_default_constructible<_Deleter>::value &&
                          !is_pointer<_Deleter>::value>::type;
 
   template <class _ArgType>
-  using _EnableIfDeleterConstructible _LIBCPP_NODEBUG_TYPE  =
+  using _EnableIfDeleterConstructible _LIBCPP_NODEBUG  =
       typename enable_if<is_constructible<deleter_type, _ArgType>::value>::type;
 
   template <class _Pp>
-  using _EnableIfPointerConvertible _LIBCPP_NODEBUG_TYPE  = typename enable_if<
+  using _EnableIfPointerConvertible _LIBCPP_NODEBUG  = typename enable_if<
       _CheckArrayPointerConversion<_Pp>::value
   >::type;
 
   template <class _UPtr, class _Up,
         class _ElemT = typename _UPtr::element_type>
-  using _EnableIfMoveConvertible _LIBCPP_NODEBUG_TYPE  = typename enable_if<
+  using _EnableIfMoveConvertible _LIBCPP_NODEBUG  = typename enable_if<
       is_array<_Up>::value &&
       is_same<pointer, element_type*>::value &&
       is_same<typename _UPtr::pointer, _ElemT*>::value &&
@@ -383,13 +383,13 @@
     >::type;
 
   template <class _UDel>
-  using _EnableIfDeleterConvertible _LIBCPP_NODEBUG_TYPE  = typename enable_if<
+  using _EnableIfDeleterConvertible _LIBCPP_NODEBUG  = typename enable_if<
       (is_reference<_Dp>::value && is_same<_Dp, _UDel>::value) ||
       (!is_reference<_Dp>::value && is_convertible<_UDel, _Dp>::value)
     >::type;
 
   template <class _UDel>
-  using _EnableIfDeleterAssignable _LIBCPP_NODEBUG_TYPE  = typename enable_if<
+  using _EnableIfDeleterAssignable _LIBCPP_NODEBUG  = typename enable_if<
       is_assignable<_Dp&, _UDel&&>::value
     >::type;
 
diff --git a/libcxx/include/__tuple b/libcxx/include/__tuple
--- a/libcxx/include/__tuple
+++ b/libcxx/include/__tuple
@@ -58,19 +58,19 @@
 template <size_t _Ip, class _Tp>
 struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const _Tp>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
+    typedef _LIBCPP_NODEBUG typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
 };
 
 template <size_t _Ip, class _Tp>
 struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, volatile _Tp>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
+    typedef _LIBCPP_NODEBUG typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
 };
 
 template <size_t _Ip, class _Tp>
 struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const volatile _Tp>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
+    typedef _LIBCPP_NODEBUG typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
 };
 
 template <class _Tp> struct __tuple_like : false_type {};
@@ -99,7 +99,7 @@
 
 template<typename _Tp, size_t ..._Extra> struct __repeat;
 template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<__integer_sequence<_Tp, _Np...>, _Extra...> {
-  typedef _LIBCPP_NODEBUG_TYPE __integer_sequence<_Tp,
+  typedef _LIBCPP_NODEBUG __integer_sequence<_Tp,
                            _Np...,
                            sizeof...(_Np) + _Np...,
                            2 * sizeof...(_Np) + _Np...,
@@ -253,7 +253,7 @@
 namespace __indexer_detail {
 
 template <size_t _Idx, class _Tp>
-struct __indexed { using type _LIBCPP_NODEBUG_TYPE = _Tp; };
+struct __indexed { using type _LIBCPP_NODEBUG = _Tp; };
 
 template <class _Types, class _Indexes> struct __indexer;
 
@@ -268,7 +268,7 @@
 } // namespace __indexer_detail
 
 template <size_t _Idx, class ..._Types>
-using __type_pack_element _LIBCPP_NODEBUG_TYPE = typename decltype(
+using __type_pack_element _LIBCPP_NODEBUG = typename decltype(
     __indexer_detail::__at_index<_Idx>(
         __indexer_detail::__indexer<
             __tuple_types<_Types...>,
@@ -281,7 +281,7 @@
 struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...>>
 {
     static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
-    typedef _LIBCPP_NODEBUG_TYPE __type_pack_element<_Ip, _Types...> type;
+    typedef _LIBCPP_NODEBUG __type_pack_element<_Ip, _Types...> type;
 };
 
 
@@ -301,34 +301,34 @@
 };
 template <>
 struct __apply_cv_mf<false, true, false> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG_TYPE  = const _Tp;
+  template <class _Tp> using __apply _LIBCPP_NODEBUG  = const _Tp;
 };
 template <>
 struct __apply_cv_mf<false, false, true> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG_TYPE  = volatile _Tp;
+  template <class _Tp> using __apply _LIBCPP_NODEBUG  = volatile _Tp;
 };
 template <>
 struct __apply_cv_mf<false, true, true> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG_TYPE  = const volatile _Tp;
+  template <class _Tp> using __apply _LIBCPP_NODEBUG  = const volatile _Tp;
 };
 template <>
 struct __apply_cv_mf<true, false, false> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG_TYPE  = _Tp&;
+  template <class _Tp> using __apply _LIBCPP_NODEBUG  = _Tp&;
 };
 template <>
 struct __apply_cv_mf<true, true, false> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG_TYPE  = const _Tp&;
+  template <class _Tp> using __apply _LIBCPP_NODEBUG  = const _Tp&;
 };
 template <>
 struct __apply_cv_mf<true, false, true> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG_TYPE  = volatile _Tp&;
+  template <class _Tp> using __apply _LIBCPP_NODEBUG  = volatile _Tp&;
 };
 template <>
 struct __apply_cv_mf<true, true, true> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG_TYPE = const volatile _Tp&;
+  template <class _Tp> using __apply _LIBCPP_NODEBUG = const volatile _Tp&;
 };
 template <class _Tp, class _RawTp = typename remove_reference<_Tp>::type>
-using __apply_cv_t _LIBCPP_NODEBUG_TYPE  = __apply_cv_mf<
+using __apply_cv_t _LIBCPP_NODEBUG  = __apply_cv_mf<
     is_lvalue_reference<_Tp>::value,
     is_const<_RawTp>::value,
     is_volatile<_RawTp>::value>;
@@ -347,7 +347,7 @@
 struct __make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>> {
   // Specialization for pair, tuple, and __tuple_types
   template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
-  using __apply_quals _LIBCPP_NODEBUG_TYPE = __tuple_types<
+  using __apply_quals _LIBCPP_NODEBUG = __tuple_types<
       typename _ApplyFn::template __apply<__type_pack_element<_Idx, _Types...>>...
     >;
 };
@@ -375,12 +375,12 @@
 
 template <class ..._Types, size_t _Ep>
 struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> {
-  typedef _LIBCPP_NODEBUG_TYPE __tuple_types<_Types...> type;
+  typedef _LIBCPP_NODEBUG __tuple_types<_Types...> type;
 };
 
 template <class ..._Types, size_t _Ep>
 struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> {
-  typedef _LIBCPP_NODEBUG_TYPE __tuple_types<_Types...> type;
+  typedef _LIBCPP_NODEBUG __tuple_types<_Types...> type;
 };
 
 template <bool ..._Preds>
@@ -454,12 +454,12 @@
 template <size_t _Ip, class ..._Tp>
 struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> >
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
+    typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
 };
 
 #if _LIBCPP_STD_VER > 11
 template <size_t _Ip, class ..._Tp>
-using tuple_element_t _LIBCPP_NODEBUG_TYPE  = typename tuple_element <_Ip, _Tp...>::type;
+using tuple_element_t _LIBCPP_NODEBUG  = typename tuple_element <_Ip, _Tp...>::type;
 #endif
 
 template <bool _IsTuple, class _SizeTrait, size_t _Expected>
@@ -471,7 +471,7 @@
 
 template <class _Tuple, size_t _ExpectedSize,
           class _RawTuple = typename __uncvref<_Tuple>::type>
-using __tuple_like_with_size _LIBCPP_NODEBUG_TYPE = __tuple_like_with_size_imp<
+using __tuple_like_with_size _LIBCPP_NODEBUG = __tuple_like_with_size_imp<
                                    __tuple_like<_RawTuple>::value,
                                    tuple_size<_RawTuple>, _ExpectedSize
                               >;
diff --git a/libcxx/include/__utility/integer_sequence.h b/libcxx/include/__utility/integer_sequence.h
--- a/libcxx/include/__utility/integer_sequence.h
+++ b/libcxx/include/__utility/integer_sequence.h
@@ -39,11 +39,11 @@
 #if __has_builtin(__make_integer_seq) && !defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
 
 template <class _Tp, _Tp _Ep>
-using __make_integer_sequence _LIBCPP_NODEBUG_TYPE = __make_integer_seq<integer_sequence, _Tp, _Ep>;
+using __make_integer_sequence _LIBCPP_NODEBUG = __make_integer_seq<integer_sequence, _Tp, _Ep>;
 
 #else
 
-template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked _LIBCPP_NODEBUG_TYPE  =
+template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked _LIBCPP_NODEBUG  =
   typename __detail::__make<_Np>::type::template __convert<integer_sequence, _Tp>;
 
 template <class _Tp, _Tp _Ep>
@@ -54,11 +54,11 @@
     static_assert(0 <= _Ep, "std::make_integer_sequence must have a non-negative sequence length");
     // Workaround GCC bug by preventing bad installations when 0 <= _Ep
     // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929
-    typedef _LIBCPP_NODEBUG_TYPE  __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type;
+    typedef _LIBCPP_NODEBUG  __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type;
 };
 
 template <class _Tp, _Tp _Ep>
-using __make_integer_sequence _LIBCPP_NODEBUG_TYPE = typename __make_integer_sequence_checked<_Tp, _Ep>::type;
+using __make_integer_sequence _LIBCPP_NODEBUG = typename __make_integer_sequence_checked<_Tp, _Ep>::type;
 
 #endif
 
diff --git a/libcxx/include/__utility/move.h b/libcxx/include/__utility/move.h
--- a/libcxx/include/__utility/move.h
+++ b/libcxx/include/__utility/move.h
@@ -22,7 +22,7 @@
 template <class _Tp>
 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR typename remove_reference<_Tp>::type&&
 move(_Tp&& __t) _NOEXCEPT {
-  typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up;
+  typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type _Up;
   return static_cast<_Up&&>(__t);
 }
 
diff --git a/libcxx/include/__utility/pair.h b/libcxx/include/__utility/pair.h
--- a/libcxx/include/__utility/pair.h
+++ b/libcxx/include/__utility/pair.h
@@ -73,7 +73,7 @@
     }
 #else
     template <bool _Val>
-    using _EnableB _LIBCPP_NODEBUG_TYPE = typename enable_if<_Val, bool>::type;
+    using _EnableB _LIBCPP_NODEBUG = typename enable_if<_Val, bool>::type;
 
     struct _CheckArgs {
       template <int&...>
@@ -107,7 +107,7 @@
     };
 
     template <bool _MaybeEnable>
-    using _CheckArgsDep _LIBCPP_NODEBUG_TYPE = typename conditional<
+    using _CheckArgsDep _LIBCPP_NODEBUG = typename conditional<
       _MaybeEnable, _CheckArgs, __check_tuple_constructor_fail>::type;
 
     struct _CheckTupleLikeConstructor {
@@ -129,7 +129,7 @@
     };
 
     template <class _Tuple>
-    using _CheckTLC _LIBCPP_NODEBUG_TYPE = typename conditional<
+    using _CheckTLC _LIBCPP_NODEBUG = typename conditional<
         __tuple_like_with_size<_Tuple, 2>::value
             && !is_same<typename decay<_Tuple>::type, pair>::value,
         _CheckTupleLikeConstructor,
@@ -411,13 +411,13 @@
 template <class _T1, class _T2>
 struct _LIBCPP_TEMPLATE_VIS tuple_element<0, pair<_T1, _T2> >
 {
-    typedef _LIBCPP_NODEBUG_TYPE _T1 type;
+    typedef _LIBCPP_NODEBUG _T1 type;
 };
 
 template <class _T1, class _T2>
 struct _LIBCPP_TEMPLATE_VIS tuple_element<1, pair<_T1, _T2> >
 {
-    typedef _LIBCPP_NODEBUG_TYPE _T2 type;
+    typedef _LIBCPP_NODEBUG _T2 type;
 };
 
 template <size_t _Ip> struct __get_pair;
diff --git a/libcxx/include/tuple b/libcxx/include/tuple
--- a/libcxx/include/tuple
+++ b/libcxx/include/tuple
@@ -1128,7 +1128,7 @@
 typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(tuple<_Tp...>& __t) _NOEXCEPT
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type;
+    typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type;
     return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get();
 }
 
@@ -1137,7 +1137,7 @@
 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(const tuple<_Tp...>& __t) _NOEXCEPT
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type;
+    typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type;
     return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get();
 }
 
@@ -1146,7 +1146,7 @@
 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
 get(tuple<_Tp...>&& __t) _NOEXCEPT
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type;
+    typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type;
     return static_cast<type&&>(
              static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get());
 }
@@ -1156,7 +1156,7 @@
 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
 get(const tuple<_Tp...>&& __t) _NOEXCEPT
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type;
+    typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type;
     return static_cast<const type&&>(
              static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get());
 }
@@ -1375,7 +1375,7 @@
 template <class ..._Ttypes, class ..._Utypes>
 struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> >
 {
-    typedef _LIBCPP_NODEBUG_TYPE tuple<_Ttypes..., _Utypes...> type;
+    typedef _LIBCPP_NODEBUG tuple<_Ttypes..., _Utypes...> type;
 };
 
 template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples>
@@ -1386,7 +1386,7 @@
 template <class ..._Types, class _Tuple0>
 struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename __tuple_cat_type<tuple<_Types...>,
+    typedef _LIBCPP_NODEBUG typename __tuple_cat_type<tuple<_Types...>,
             typename __make_tuple_types<typename __uncvref<_Tuple0>::type>::type>::type
                                                                            type;
 };
@@ -1416,7 +1416,7 @@
 template <>
 struct __tuple_cat_return<>
 {
-    typedef _LIBCPP_NODEBUG_TYPE tuple<> type;
+    typedef _LIBCPP_NODEBUG tuple<> type;
 };
 
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
@@ -1432,7 +1432,7 @@
 template <class ..._Types, size_t ..._I0, class _Tuple0>
 struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple0>::type _T0;
+    typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple0>::type _T0;
     typedef tuple<_Types..., typename __apply_cv<_Tuple0,
                           typename tuple_element<_I0, _T0>::type>::type&&...> type;
 };
@@ -1480,8 +1480,8 @@
     typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type
     operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls)
     {
-        typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple0>::type _T0;
-        typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple1>::type _T1;
+        typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple0>::type _T0;
+        typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple1>::type _T1;
         return __tuple_cat<
             tuple<_Types...,
                   typename __apply_cv<_Tuple0, typename tuple_element<
@@ -1501,7 +1501,7 @@
 typename __tuple_cat_return<_Tuple0, _Tuples...>::type
 tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls)
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple0>::type _T0;
+    typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple0>::type _T0;
     return __tuple_cat<tuple<>, __tuple_indices<>,
                   typename __make_tuple_indices<tuple_size<_T0>::value>::type>()
                   (tuple<>(), _VSTD::forward<_Tuple0>(__t0),
diff --git a/libcxx/include/type_traits b/libcxx/include/type_traits
--- a/libcxx/include/type_traits
+++ b/libcxx/include/type_traits
@@ -459,46 +459,46 @@
 typedef _LIBCPP_BOOL_CONSTANT(false) false_type;
 
 template <bool _Val>
-using _BoolConstant _LIBCPP_NODEBUG_TYPE = integral_constant<bool, _Val>;
+using _BoolConstant _LIBCPP_NODEBUG = integral_constant<bool, _Val>;
 
 template <bool> struct _MetaBase;
 template <>
 struct _MetaBase<true> {
   template <class _Tp, class _Up>
-  using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Tp;
+  using _SelectImpl _LIBCPP_NODEBUG = _Tp;
   template <template <class...> class _FirstFn, template <class...> class, class ..._Args>
-  using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _FirstFn<_Args...>;
+  using _SelectApplyImpl _LIBCPP_NODEBUG = _FirstFn<_Args...>;
   template <class _First, class...>
-  using _FirstImpl _LIBCPP_NODEBUG_TYPE = _First;
+  using _FirstImpl _LIBCPP_NODEBUG = _First;
   template <class, class _Second, class...>
-  using _SecondImpl _LIBCPP_NODEBUG_TYPE = _Second;
+  using _SecondImpl _LIBCPP_NODEBUG = _Second;
   template <class _Tp = void>
-  using _EnableIfImpl _LIBCPP_NODEBUG_TYPE = _Tp;
+  using _EnableIfImpl _LIBCPP_NODEBUG = _Tp;
   template <class _Result, class _First, class ..._Rest>
-  using _OrImpl _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>;
+  using _OrImpl _LIBCPP_NODEBUG = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>;
 };
 
 template <>
 struct _MetaBase<false> {
   template <class _Tp, class _Up>
-  using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Up;
+  using _SelectImpl _LIBCPP_NODEBUG = _Up;
   template <template <class...> class, template <class...> class _SecondFn, class ..._Args>
-  using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _SecondFn<_Args...>;
+  using _SelectApplyImpl _LIBCPP_NODEBUG = _SecondFn<_Args...>;
   template <class _Result, class ...>
-  using _OrImpl _LIBCPP_NODEBUG_TYPE = _Result;
+  using _OrImpl _LIBCPP_NODEBUG = _Result;
 };
 template <bool _Cond, class _Ret = void>
-using _EnableIf _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _EnableIfImpl<_Ret>;
+using _EnableIf _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _EnableIfImpl<_Ret>;
 template <bool _Cond, class _IfRes, class _ElseRes>
-using _If _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>;
+using _If _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>;
 template <class ..._Rest>
-using _Or _LIBCPP_NODEBUG_TYPE = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>;
+using _Or _LIBCPP_NODEBUG = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>;
 template <class _Pred>
 struct _Not : _BoolConstant<!_Pred::value> {};
 template <class ..._Args>
-using _FirstType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>;
+using _FirstType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>;
 template <class ..._Args>
-using _SecondType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>;
+using _SecondType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>;
 
 template <class ...> using __expand_to_true = true_type;
 template <class ..._Pred>
@@ -506,7 +506,7 @@
 template <class ...>
 false_type __and_helper(...);
 template <class ..._Pred>
-using _And _LIBCPP_NODEBUG_TYPE = decltype(__and_helper<_Pred...>(0));
+using _And _LIBCPP_NODEBUG = decltype(__and_helper<_Pred...>(0));
 
 template <template <class...> class _Func, class ..._Args>
 struct _Lazy : _Func<_Args...> {};
@@ -519,7 +519,7 @@
 false_type __sfinae_test_impl(...);
 
 template <template <class ...> class _Templ, class ..._Args>
-using _IsValidExpansion _LIBCPP_NODEBUG_TYPE = decltype(__sfinae_test_impl<_Templ, _Args...>(0));
+using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0));
 
 template <class>
 struct __void_t { typedef void type; };
@@ -528,7 +528,7 @@
 struct __identity { typedef _Tp type; };
 
 template <class _Tp>
-using __identity_t _LIBCPP_NODEBUG_TYPE = typename __identity<_Tp>::type;
+using __identity_t _LIBCPP_NODEBUG = typename __identity<_Tp>::type;
 
 template <class _Tp, bool>
 struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {};
@@ -1296,7 +1296,7 @@
 // add_const
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_const {
-  typedef _LIBCPP_NODEBUG_TYPE const _Tp type;
+  typedef _LIBCPP_NODEBUG const _Tp type;
 };
 
 #if _LIBCPP_STD_VER > 11
@@ -1306,7 +1306,7 @@
 // add_volatile
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_volatile {
-  typedef _LIBCPP_NODEBUG_TYPE volatile _Tp type;
+  typedef _LIBCPP_NODEBUG volatile _Tp type;
 };
 
 #if _LIBCPP_STD_VER > 11
@@ -1315,7 +1315,7 @@
 
 // add_cv
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_cv {
-  typedef _LIBCPP_NODEBUG_TYPE const volatile _Tp type;
+  typedef _LIBCPP_NODEBUG const volatile _Tp type;
 };
 
 #if _LIBCPP_STD_VER > 11
@@ -1331,9 +1331,9 @@
 
 #else // __has_keyword(__remove_reference)
 
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference        {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&>  {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference        {typedef _LIBCPP_NODEBUG _Tp type;};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&>  {typedef _LIBCPP_NODEBUG _Tp type;};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG _Tp type;};
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type;
@@ -1343,21 +1343,21 @@
 
 // add_lvalue_reference
 
-template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl            { typedef _LIBCPP_NODEBUG_TYPE _Tp  type; };
-template <class _Tp                                       > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE _Tp& type; };
+template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl            { typedef _LIBCPP_NODEBUG _Tp  type; };
+template <class _Tp                                       > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG _Tp& type; };
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_lvalue_reference
-{typedef _LIBCPP_NODEBUG_TYPE typename  __add_lvalue_reference_impl<_Tp>::type type;};
+{typedef _LIBCPP_NODEBUG typename  __add_lvalue_reference_impl<_Tp>::type type;};
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
 #endif
 
-template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl            { typedef _LIBCPP_NODEBUG_TYPE  _Tp   type; };
-template <class _Tp                                       > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE  _Tp&& type; };
+template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl            { typedef _LIBCPP_NODEBUG  _Tp   type; };
+template <class _Tp                                       > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG  _Tp&& type; };
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_rvalue_reference
-{typedef _LIBCPP_NODEBUG_TYPE  typename __add_rvalue_reference_impl<_Tp>::type type;};
+{typedef _LIBCPP_NODEBUG  typename __add_rvalue_reference_impl<_Tp>::type type;};
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
@@ -1378,17 +1378,17 @@
 
 template <class _Tp>
 struct __uncvref  {
-    typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<typename remove_reference<_Tp>::type>::type type;
+    typedef _LIBCPP_NODEBUG typename remove_cv<typename remove_reference<_Tp>::type>::type type;
 };
 
 template <class _Tp>
 struct __unconstref {
-    typedef _LIBCPP_NODEBUG_TYPE typename remove_const<typename remove_reference<_Tp>::type>::type type;
+    typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type;
 };
 
 #ifndef _LIBCPP_CXX03_LANG
 template <class _Tp>
-using __uncvref_t _LIBCPP_NODEBUG_TYPE = typename __uncvref<_Tp>::type;
+using __uncvref_t _LIBCPP_NODEBUG = typename __uncvref<_Tp>::type;
 #endif
 
 // __is_same_uncvref
@@ -1413,11 +1413,11 @@
 
 // remove_pointer
 
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer                      {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*>                {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const>          {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile>       {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer                      {typedef _LIBCPP_NODEBUG _Tp type;};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*>                {typedef _LIBCPP_NODEBUG _Tp type;};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const>          {typedef _LIBCPP_NODEBUG _Tp type;};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile>       {typedef _LIBCPP_NODEBUG _Tp type;};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG _Tp type;};
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type;
@@ -1429,12 +1429,12 @@
         bool = __is_referenceable<_Tp>::value ||
                 _IsSame<typename remove_cv<_Tp>::type, void>::value>
 struct __add_pointer_impl
-    {typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type* type;};
+    {typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type* type;};
 template <class _Tp> struct __add_pointer_impl<_Tp, false>
-    {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
+    {typedef _LIBCPP_NODEBUG _Tp type;};
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer
-    {typedef _LIBCPP_NODEBUG_TYPE typename __add_pointer_impl<_Tp>::type type;};
+    {typedef _LIBCPP_NODEBUG typename __add_pointer_impl<_Tp>::type type;};
 
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type;
@@ -1621,13 +1621,13 @@
 
 template <class _Up, bool>
 struct __decay {
-    typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<_Up>::type type;
+    typedef _LIBCPP_NODEBUG typename remove_cv<_Up>::type type;
 };
 
 template <class _Up>
 struct __decay<_Up, true> {
 public:
-    typedef _LIBCPP_NODEBUG_TYPE typename conditional
+    typedef _LIBCPP_NODEBUG typename conditional
                      <
                          is_array<_Up>::value,
                          typename remove_extent<_Up>::type*,
@@ -1644,9 +1644,9 @@
 struct _LIBCPP_TEMPLATE_VIS decay
 {
 private:
-    typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up;
+    typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type _Up;
 public:
-    typedef _LIBCPP_NODEBUG_TYPE typename __decay<_Up, __is_referenceable<_Up>::value>::type type;
+    typedef _LIBCPP_NODEBUG typename __decay<_Up, __is_referenceable<_Up>::value>::type type;
 };
 
 #if _LIBCPP_STD_VER > 11
@@ -2214,26 +2214,26 @@
 template <class _Hp, class _Tp, size_t _Size>
 struct __find_first<__type_list<_Hp, _Tp>, _Size, true>
 {
-    typedef _LIBCPP_NODEBUG_TYPE _Hp type;
+    typedef _LIBCPP_NODEBUG _Hp type;
 };
 
 template <class _Hp, class _Tp, size_t _Size>
 struct __find_first<__type_list<_Hp, _Tp>, _Size, false>
 {
-    typedef _LIBCPP_NODEBUG_TYPE typename __find_first<_Tp, _Size>::type type;
+    typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type;
 };
 
 template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value,
                              bool = is_volatile<typename remove_reference<_Tp>::type>::value>
 struct __apply_cv
 {
-    typedef _LIBCPP_NODEBUG_TYPE _Up type;
+    typedef _LIBCPP_NODEBUG _Up type;
 };
 
 template <class _Tp, class _Up>
 struct __apply_cv<_Tp, _Up, true, false>
 {
-    typedef _LIBCPP_NODEBUG_TYPE const _Up type;
+    typedef _LIBCPP_NODEBUG const _Up type;
 };
 
 template <class _Tp, class _Up>
@@ -2379,7 +2379,7 @@
                                             true ? declval<_Tp>() : declval<_Up>()
                                             )>::type>
 {
-  typedef _LIBCPP_NODEBUG_TYPE typename decay<decltype(
+  typedef _LIBCPP_NODEBUG typename decay<decltype(
                          true ? declval<_Tp>() : declval<_Up>()
                          )>::type type;
 };
@@ -2672,7 +2672,7 @@
 
 // is_assignable
 
-template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG_TYPE _Tp type; };
+template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG _Tp type; };
 
 #if __has_keyword(__is_assignable)
 
diff --git a/libcxx/include/variant b/libcxx/include/variant
--- a/libcxx/include/variant
+++ b/libcxx/include/variant
@@ -1196,11 +1196,11 @@
   template <class _Dest>
   static auto __test_impl(_Dest (&&)[1]) -> __identity<_Dest>;
   template <class _Dest, class _Source>
-  using _Apply _LIBCPP_NODEBUG_TYPE = decltype(__test_impl<_Dest>({declval<_Source>()}));
+  using _Apply _LIBCPP_NODEBUG = decltype(__test_impl<_Dest>({declval<_Source>()}));
 };
 
 template <class _Dest, class _Source>
-using __check_for_narrowing _LIBCPP_NODEBUG_TYPE =
+using __check_for_narrowing _LIBCPP_NODEBUG =
   typename _If<
 #ifdef _LIBCPP_ENABLE_NARROWING_CONVERSIONS_IN_VARIANT
     false &&
@@ -1244,11 +1244,11 @@
 template <size_t ..._Idx>
 struct __make_overloads_imp<__tuple_indices<_Idx...> > {
   template <class ..._Types>
-  using _Apply _LIBCPP_NODEBUG_TYPE = __all_overloads<__overload<_Types, _Idx>...>;
+  using _Apply _LIBCPP_NODEBUG = __all_overloads<__overload<_Types, _Idx>...>;
 };
 
 template <class ..._Types>
-using _MakeOverloads _LIBCPP_NODEBUG_TYPE = typename __make_overloads_imp<
+using _MakeOverloads _LIBCPP_NODEBUG = typename __make_overloads_imp<
     __make_indices_imp<sizeof...(_Types), 0> >::template _Apply<_Types...>;
 
 template <class _Tp, class... _Types>