commit 90118704de6214d9a9ce5d82fea8d364d758bc60
Author: timshen <timshen@google.com>
Date:   Tue Jan 6 19:30:27 2015 -0800

    	PR libstdc++/64239
    	* include/bits/regex.h (match_results<>::swap): Use std::swap
    	instead of swap.
    	* include/bits/regex_compiler.tcc (_Compiler<>::_M_quantifier):
    	Likewise.
    	* testsuite/28_regex/match_results/swap.cc: New testcase.

diff --git a/libstdc++-v3/include/bits/regex.h b/libstdc++-v3/include/bits/regex.h
index 9b7ed8c..52c2384 100644
--- a/libstdc++-v3/include/bits/regex.h
+++ b/libstdc++-v3/include/bits/regex.h
@@ -1863,6 +1863,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       void
       swap(match_results& __that)
       {
+	using std::swap;
 	_Base_type::swap(__that);
 	swap(_M_begin, __that._M_begin);
       }
diff --git a/libstdc++-v3/include/bits/regex_compiler.tcc b/libstdc++-v3/include/bits/regex_compiler.tcc
index 57bafa3..33d7118 100644
--- a/libstdc++-v3/include/bits/regex_compiler.tcc
+++ b/libstdc++-v3/include/bits/regex_compiler.tcc
@@ -276,7 +276,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 		{
 		  auto& __tmp = (*_M_nfa)[__stack.top()];
 		  __stack.pop();
-		  swap(__tmp._M_next, __tmp._M_alt);
+		  std::swap(__tmp._M_next, __tmp._M_alt);
 		}
 	    }
 	  _M_stack.push(__e);
diff --git a/libstdc++-v3/testsuite/28_regex/match_results/swap.cc b/libstdc++-v3/testsuite/28_regex/match_results/swap.cc
new file mode 100644
index 0000000..18248c1
--- /dev/null
+++ b/libstdc++-v3/testsuite/28_regex/match_results/swap.cc
@@ -0,0 +1,43 @@
+// { dg-options "-std=gnu++11" }
+
+//
+// Copyright (C) 2015 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/>.
+
+#include <regex>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  std::cmatch m;
+  std::regex_match("a", m, std::regex("a"));
+  std::cmatch mm1 = m, mm2;
+  mm1.swap(mm2);
+  VERIFY(m == mm2);
+  std::swap(mm1, mm2);
+  VERIFY(m == mm1);
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}