--- a/absyntax/absyntax.def	Wed May 11 19:38:31 2016 +0100
+++ b/absyntax/absyntax.def	Fri May 13 12:18:50 2016 +0100
@@ -267,6 +267,7 @@
 SYM_REF0(lword_type_name_c)
 SYM_REF0(string_type_name_c)
 SYM_REF0(wstring_type_name_c)
+SYM_REF0(void_c) /* a non-standard extension! */
 
   /*****************************************************************/
   /* Keywords defined in "Safety Software Technical Specification" */