[racket] sequence-filter of in-port

Hi Richard,

What version of Racket are you using? I've tested your code with
5.3.0.16 and it worked as expected, returning '() in both cases.

2012/7/22 Richard Cleis <rcleis at me.com>:
> I was attempting to use sequence-filter and in-port to filter large files into small lists, but the following error occurs on the occasion that everything is filtered:
>
> apply: expects type <proper list> as 2nd argument, given: #f; other arguments were: #<procedure:might-filter-all>
>
> ;; equivalent arbitrary examples (I think)
>
> (define (might-filter-all x) (= x 99))  ; both cases below return '(3), if 99 is changed to 3
>
> (sequence->list (sequence-filter might-filter-all (in-range 3 4)))                         ; returns '()
> (sequence->list (sequence-filter might-filter-all (in-port read (open-input-string "3")))) ; an error
>
> I could not find in-port in sequence.rkt, so I did not read it.
>
> Should the in-port sequence be different?
>
> rac
>
> ____________________
>   Racket Users list:
>   http://lists.racket-lang.org/users