diff -r 59435d4c5e0c -r 0d4d3a502d82 absyntax_utils/get_datatype_info.hh
--- a/absyntax_utils/get_datatype_info.hh	Fri May 06 11:48:02 2016 +0300
+++ b/absyntax_utils/get_datatype_info.hh	Thu Sep 08 17:44:44 2016 +0100
@@ -165,6 +165,8 @@
     static bool is_ANY_SAFESTRING                  (symbol_c *type_symbol);
     static bool is_ANY_STRING_compatible           (symbol_c *type_symbol);
 
+    // A non-standard extension --> data type 'VOID' (used for functions that do not return any data)
+    static bool is_VOID                            (symbol_c *type_symbol);