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diff --git a/libstdc++-v3/testsuite/20_util/function_objects/range.cmp/equal_to.cc b/libstdc++-v3/testsuite/20_util/function_objects/range.cmp/equal_to.cc
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index 00000000000..c3ceb316a58
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+++ b/libstdc++-v3/testsuite/20_util/function_objects/range.cmp/equal_to.cc
@@ -0,0 +1,77 @@
+// Copyright (C) 2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do run { target c++2a } }
+
+#include <functional>
+#include <testsuite_hooks.h>
+
+// C++20 [range.cmp]
+
+using F = std::ranges::equal_to;
+static_assert( std::is_default_constructible_v<F> );
+static_assert( std::is_copy_constructible_v<F> );
+static_assert( std::is_move_constructible_v<F> );
+static_assert( std::is_copy_assignable_v<F> );
+static_assert( std::is_move_assignable_v<F> );
+
+static_assert( ! std::is_invocable_v<F> );
+static_assert( ! std::is_invocable_v<F, int&> );
+static_assert( ! std::is_invocable_v<F, int, void> );
+static_assert( ! std::is_invocable_v<F, int, void*> );
+static_assert( std::is_nothrow_invocable_r_v<bool, F&, int&, int> );
+static_assert( std::is_nothrow_invocable_r_v<bool, F, const long&, char> );
+static_assert( std::is_nothrow_invocable_r_v<bool, const F&, short, int&> );
+static_assert( std::is_nothrow_invocable_r_v<bool, const F, const char, char> );
+
+using T = F::is_transparent; // required typedef
+
+static_assert( std::ranges::equal_to{}(99, 99.0) );
+static_assert( ! std::ranges::equal_to{}(99, 99.01) );
+static_assert( ! std::ranges::equal_to{}(99, 140L) );
+
+void
+test01()
+{
+  F f;
+  int a[2]{};
+  VERIFY( f(&a, (void*)&a[0]) );
+  VERIFY( ! f(&a, (void*)&a[1]) );
+  VERIFY( f(&a + 1, (void*)(a + 2)) );
+}
+
+struct X { };
+int operator==(X, X) noexcept { return 2; }
+int operator!=(X, X) { return 0; }
+
+static_assert( std::is_nothrow_invocable_r_v<bool, F&, X, X> );
+
+void
+test02()
+{
+  X x;
+  F f;
+  VERIFY( f(x, x) );
+}
+
+int
+main()
+{
+  test01();
+  test02();
+}