Add crtdbg_test.cpp to see what happens on Appveyor

test/crtdbg_test.cpp

@@ -0,0 +1,13 @@
+#include <boost/core/lightweight_test.hpp>
+#include <vector>
+
+int main()
+{
+    BOOST_TEST(true);
+
+    std::vector<int> v;
+    std::vector<int>::iterator i = v.end();
+    ++i;
+
+    return boost::report_errors();
+}