--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libstdc++-v3/testsuite/20_util/from_chars/compare.cc	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,50 @@
+// Copyright (C) 2020 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 <charconv>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  std::from_chars_result r1{}, r2{};
+  VERIFY( r1 == r1 );
+  VERIFY( !(r1 != r1) );
+  VERIFY( r2 == r1 );
+  VERIFY( !(r2 != r1) );
+  r1.ptr = "";
+  VERIFY( r1 == r1 );
+  VERIFY( r1 != r2 );
+  r2.ptr = "a" + 1;
+  VERIFY( r1 != r2 );
+  r2.ptr = r1.ptr;
+  r2.ec = std::errc::invalid_argument;
+  VERIFY( r1 != r2 );
+  r1.ec = std::errc::no_such_file_or_directory;
+  VERIFY( r1 != r2 );
+  r1.ec = std::errc::invalid_argument;
+  VERIFY( r2 == r1 );
+}
+
+int
+main()
+{
+  test01();
+}