Extend std::function test for PR 68995

	* testsuite/20_util/function/68995.cc: Test reference_wrapper cases.

From-SVN: r232294

libstdc++-v3/ChangeLog

 2016-01-12  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/20_util/function/68995.cc: Test reference_wrapper cases.
+
 	PR libstdc++/69005
 	PR libstdc++/69222
 	* include/std/functional (function::_Invoke): Remove, use result_of.

libstdc++-v3/testsuite/20_util/function/68995.cc

@@ -25,3 +25,8 @@
 std::tr1::shared_ptr<int> test() { return {}; }
 
 std::function<std::tr1::shared_ptr<int>()> func = test;
+std::function<std::tr1::shared_ptr<int>()> funcr = std::ref(test);
+
+void test2(std::tr1::shared_ptr<int>) { }
+
+std::function<void(std::tr1::shared_ptr<int>)> func2 = std::ref(test2);