diff --git a/libcxx/include/__algorithm/copy.h b/libcxx/include/__algorithm/copy.h
--- a/libcxx/include/__algorithm/copy.h
+++ b/libcxx/include/__algorithm/copy.h
@@ -80,19 +80,18 @@
 }
 
 template <class _InIter, class _Sent, class _OutIter,
-          __enable_if_t<is_copy_constructible<_InIter>::value
-                     && is_copy_constructible<_Sent>::value
-                     && is_copy_constructible<_OutIter>::value> >
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
-pair<_InIter, _OutIter> __copy(_InIter __first, _Sent __last, _OutIter __result) {
+          class __enable_if_t<is_copy_constructible<_InIter>::value && is_copy_constructible<_Sent>::value &&
+                              is_copy_constructible<_OutIter>::value> >
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 pair<_InIter, _OutIter> __copy(_InIter __first, _Sent __last,
+                                                                                          _OutIter __result) {
   auto __ret = std::__copy_impl(std::__unwrap_iter(__first), std::__unwrap_iter(__last), std::__unwrap_iter(__result));
   return std::make_pair(std::__rewrap_iter(__first, __ret.first), std::__rewrap_iter(__result, __ret.second));
 }
 
 template <class _InputIterator, class _OutputIterator>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
-_OutputIterator
-copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator copy(_InputIterator __first,
+                                                                                    _InputIterator __last,
+                                                                                    _OutputIterator __result) {
   return std::__copy(__first, __last, __result).second;
 }