keyword argument support, removed last traces of std::function<> usage
diff --git a/example/example9.cpp b/example/example9.cpp
index 0e070b1..81b6edc 100644
--- a/example/example9.cpp
+++ b/example/example9.cpp
@@ -1,6 +1,5 @@
 /*
-    example/example9.cpp -- Example 9: nested modules
-    and internal references
+    example/example9.cpp -- nested modules and internal references
 
     Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>