See http://ccl.northwestern.edu/netlogo/docs/dictionary.html#forward"
(when (not (turtle-p *self*)) (error "Gotta call fd in turtle scope, dude (~A)" *self*))
See http://ccl.northwestern.edu/netlogo/docs/dictionary.html#forward"
(when (not (turtle-p *self*)) (error "Gotta call fd in turtle scope, dude (~A)" *self*))