1 files changed, 48 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/23_containers/set/modifiers/node_swap.cc b/libstdc++-v3/testsuite/23_containers/set/modifiers/node_swap.cc
new file mode 100644
index 00000000000..32c7d496428
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/set/modifiers/node_swap.cc
@@ -0,0 +1,48 @@
+// Copyright (C) 2018 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++17" }
+// { dg-do run { target c++1z } }
+
+#include <set>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  // PR libstdc++/82966
+  std::set<int>::node_type n1, n2;
+  n1.swap(n2);
+  VERIFY( n1.empty() );
+  VERIFY( n2.empty() );
+}
+
+void
+test02()
+{
+  std::set<int> s{1, 2};
+  std::set<int>::node_type n1 = s.extract(1), n2;
+  swap(n1, n2);
+  VERIFY( n1.empty() );
+  VERIFY( !n2.empty() );
+}
+
+int main()
+{
+  test01();
+  test02();
+}