diff --git a/list.cpp b/list.cpp
index df8cc13..e95a0ac 100644
--- a/list.cpp
+++ b/list.cpp
@@ -80,6 +80,8 @@ int main(void)
   std::cout << lst << std::endl;
   lst = reverse(lst);
   std::cout << lst << std::endl;
+  map<int, int>(lst = reverse(lst), [](int x){ return x * 2; });
+  std::cout << lst << std::endl;
   delete lst;
   return 0;
 }