Hi,<br><br>I am using R5RS mode in Racket 5.1. I was trying to use<br>the fold function form srfi/1. I got the error message that<br>the argument to null-list? is out of domain. What's wrong?<br><br>(#%require srfi/1)<br>
(null-list? '(1 2 3))<br><br>null-list?: argument out of domain (1 2 3)<br><br>Ollie <br>