Thank you very much, but although I changed else expresion, Racket sometimes returns same warning(but now with #f instead of #<void>).
But when I click Run again (sometimes twice or more) it returns what I want. That´s the strangest thing. Could it be an error in Racket settings? I attach my code, maybe I miss someting else.(please ignore auxiliary procedures, warning appears while running (set-traps) and of course set-symbol! ) -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
