[racket] typed racket and generic interfaces, is there a workaround using properties?

On 09/27/2014 09:49 AM, Alexander D. Knauth wrote:
> Like this, I think:  (but for some reason it seems to print it 3 times?)
> #lang typed/racket
> 
> (struct foo () #:transparent
>   #:property prop:custom-write
>   (lambda (this out mode)
>     (displayln "whatever")))
> 
> (print (foo))

I didn't realize #:property was legal in typed struct. I guess there
should be a documentation update here:
  http://docs.racket-lang.org/ts-reference/special-forms.html

BTW change your program to use the given port: (displayln "whatever"
out) to avoid the double printing problem, although I'm not exactly sure
why it would have that effect.

Thanks!

-- 
Anthony Carrico


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