This is syntactically brittle design. Argh.
On Jul 29, 2014, at 4:50 PM, "J. Ian Johnson" <i...@ccs.neu.edu> wrote: > 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 _________________________ Racket Developers list: http://lists.racket-lang.org/dev
