I forgot that aspect of #:when and #:unless. Sorry for the noise. -Ian ----- Original Message ----- From: "Sam Tobin-Hochstadt" <sa...@cs.indiana.edu> To: "J. Ian Johnson" <i...@ccs.neu.edu> Cc: "dev" <dev@racket-lang.org> Sent: Tuesday, July 29, 2014 4:46:49 PM GMT -05:00 US/Canada Eastern Subject: Re: [racket-dev] Surprising behavior of for/fold. Bug?
`#:when` and `#:unless` introduce nesting, a la `for/fold*`. So yes, you should expect this. Sam On Tue, Jul 29, 2014 at 1:23 PM, J. Ian Johnson <i...@ccs.neu.edu> wrote: > This will eat all your memory, > > (for/list ([x '(0 1 2 3 4 5 6)] > #:unless (= x 4) > [i (in-naturals)]) > x) > > and this won't. > > (for/list ([x '(0 1 2 3 4 5 6)] > [i (in-naturals)] > #:unless (= x 4)) > x) > > Should we expect this behavior? I was really surprised by this. > -Ian > _________________________ > Racket Developers list: > http://lists.racket-lang.org/dev _________________________ Racket Developers list: http://lists.racket-lang.org/dev
