Added negative tests for rvalue to reference_wrapper implicit conversion.

test/Jamfile.v2

@@ -22,6 +22,8 @@ run ref_test.cpp ;
 compile-fail ref_rv_fail1.cpp ;
 compile-fail ref_rv_fail2.cpp ;
 compile-fail ref_rv_fail3.cpp ;
+compile-fail ref_implicit_fail.cpp ;
+compile-fail ref_implicit_fail2.cpp ;
 
 run eif_constructors.cpp ;
 run eif_dummy_arg_disambiguation.cpp ;

test/ref_implicit_fail.cpp

@@ -0,0 +1,20 @@
+//
+// Rvalues should not implicitly convert to a reference_wrapper
+//
+// Copyright 2014 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+
+#include <boost/ref.hpp>
+
+void f( boost::reference_wrapper< int > )
+{
+}
+
+int main()
+{
+    f( 1 ); // should fail
+}

test/ref_implicit_fail2.cpp

@@ -0,0 +1,20 @@
+//
+// Rvalues should not implicitly convert to a reference_wrapper
+//
+// Copyright 2014 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+
+#include <boost/ref.hpp>
+
+void f( boost::reference_wrapper< int const > )
+{
+}
+
+int main()
+{
+    f( 1 ); // should fail
+}