--- a/absyntax_utils/search_base_type.hh	Wed May 11 19:38:31 2016 +0100
+++ b/absyntax_utils/search_base_type.hh	Fri May 13 12:18:50 2016 +0100
@@ -141,6 +141,7 @@
     void *visit(lword_type_name_c *symbol);
     void *visit(string_type_name_c *symbol);
     void *visit(wstring_type_name_c *symbol);
+    void *visit(void_c *symbol); /* A non standard datatype! */
 
     /******************************************************/
     /* Extensions to the base standard as defined in      */