Index: libcxx/include/__ranges/empty.h
===================================================================
--- libcxx/include/__ranges/empty.h
+++ libcxx/include/__ranges/empty.h
@@ -13,7 +13,6 @@
 #include <__iterator/concepts.h>
 #include <__ranges/access.h>
 #include <__ranges/size.h>
-#include <__utility/forward.h>
 #include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -29,13 +28,13 @@
 namespace __empty {
   template <class _Tp>
   concept __member_empty = requires(_Tp&& __t) {
-    bool(_VSTD::forward<_Tp>(__t).empty());
+    bool(__t.empty());
   };
 
   template<class _Tp>
   concept __can_invoke_size =
     !__member_empty<_Tp> &&
-    requires(_Tp&& __t) { ranges::size(_VSTD::forward<_Tp>(__t)); };
+    requires(_Tp&& __t) { ranges::size(__t); };
 
   template <class _Tp>
   concept __can_compare_begin_end =
@@ -50,13 +49,13 @@
     template <__member_empty _Tp>
     [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t) const
         noexcept(noexcept(bool(__t.empty()))) {
-      return __t.empty();
+      return bool(__t.empty());
     }
 
     template <__can_invoke_size _Tp>
     [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t) const
-        noexcept(noexcept(ranges::size(_VSTD::forward<_Tp>(__t)))) {
-      return ranges::size(_VSTD::forward<_Tp>(__t)) == 0;
+        noexcept(noexcept(ranges::size(__t))) {
+      return ranges::size(__t) == 0;
     }
 
     template<__can_compare_begin_end _Tp>
Index: libcxx/test/std/ranges/range.access/empty.pass.cpp
===================================================================
--- libcxx/test/std/ranges/range.access/empty.pass.cpp
+++ libcxx/test/std/ranges/range.access/empty.pass.cpp
@@ -15,11 +15,11 @@
 #include <ranges>
 
 #include <cassert>
+#include <utility>
 #include "test_macros.h"
 #include "test_iterators.h"
 
 using RangeEmptyT = decltype(std::ranges::empty);
-using RangeSizeT = decltype(std::ranges::size);
 
 static_assert(!std::is_invocable_v<RangeEmptyT, int[]>);
 static_assert(!std::is_invocable_v<RangeEmptyT, int(&)[]>);
@@ -41,12 +41,16 @@
 static_assert(!std::ranges::empty(std::as_const(array_of_incomplete)));
 static_assert(!std::ranges::empty(static_cast<const Incomplete(&&)[42]>(array_of_incomplete)));
 
-struct NonConstSizeAndEmpty {
-  int size();
+struct InputRangeWithoutSize {
+    cpp17_input_iterator<int*> begin() const;
+    cpp17_input_iterator<int*> end() const;
+};
+static_assert(!std::is_invocable_v<RangeEmptyT, const InputRangeWithoutSize&>);
+
+struct NonConstEmpty {
   bool empty();
 };
-static_assert(!std::is_invocable_v<RangeSizeT, const NonConstSizeAndEmpty&>);
-static_assert(!std::is_invocable_v<RangeEmptyT, const NonConstSizeAndEmpty&>);
+static_assert(!std::is_invocable_v<RangeEmptyT, const NonConstEmpty&>);
 
 struct HasMemberAndFunction {
   constexpr bool empty() const { return true; }
@@ -60,7 +64,7 @@
 static_assert(!std::is_invocable_v<RangeEmptyT, BadReturnType&>);
 
 struct BoolConvertible {
-  constexpr /*TODO: explicit*/ operator bool() noexcept(false) { return true; }
+  constexpr explicit operator bool() noexcept(false) { return true; }
 };
 struct BoolConvertibleReturnType {
   constexpr BoolConvertible empty() noexcept { return {}; }
@@ -159,9 +163,7 @@
   assert(std::ranges::empty(e) == false); // e.empty()
   assert(std::ranges::empty(std::as_const(e)) == true); // e.begin() == e.end()
 
-#if 0 // TODO FIXME
   assert(std::ranges::empty(EvilBeginEnd()));
-#endif
 
   return true;
 }