merged from trunk

[SVN r45230]

test/no_implicit_assign_from_lvalue_thread.cpp

@@ -0,0 +1,15 @@
+// Copyright (C) 2008 Anthony Williams
+//
+//  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/thread/thread.hpp>
+
+void do_nothing()
+{}
+
+void test()
+{
+    boost::thread t1(do_nothing);
+    boost::thread t2;
+    t2=t1;
+}