--- a/util.c	Tue May 19 17:35:16 2009 +0300
+++ b/util.c	Wed May 20 00:15:21 2009 +0300
@@ -95,6 +95,7 @@
 				luaL_argerror (L, index, "wrong key type of flags table");
 			lua_pop (L, 1);
 		}
+		return retval;
 	} else
 		luaL_argerror (L, index, "integer, string, or table of ones expected");
 	return 0; // never happens