Index: src/libcfa/iostream.c
===================================================================
--- src/libcfa/iostream.c	(revision 348006f9bbb24c9257fa8be8d10695e6da14597d)
+++ src/libcfa/iostream.c	(revision 142cf5d5bc4083f9bfbdb71d2ae41cf1ec930d79)
@@ -203,4 +203,5 @@
 	os | arg | ", ";
 	os | rest;
+	return os;
 } // ?|?