Add after_main_test

test/after_main_test_2.cpp

@@ -0,0 +1,10 @@
+
+// Copyright 2018 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+
+#include <boost/system/error_code.hpp>
+#include <cerrno>
+
+using namespace boost::system;
+
+static error_code e2( ENOENT, generic_category() );