[racket] Detecting 32/64-bit racket

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Sat Oct 29 10:31:17 EDT 2011

Another not so great way, in Racket, to tell if the current racket is
built as a 64 bit or 32 bit executable (is that what you're wanting?)

  ;; 64bit? : -> boolean
  (define (64bit?) (eq? (expt 2 61) (expt 2 61)))

I don't know if this is promised to always work going forwards, but it
is hard for me to imagine a future where it doesn't work.

Of course, it would be better if there were some documented API that
would make this definitive, but until then you're probably safe with


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