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Re: A value for "nothing"

From: HiPhish
Subject: Re: A value for "nothing"
Date: Mon, 27 Aug 2018 10:24:26 +0200

Yes, this sounds like the best solution so far.

On Sonntag, 26. August 2018 23:07:26 CEST you wrote:
> The eq? predicate is able to distinguish the three.  But I think using a
> singleton record is best:
> (define-record-type (<nil> nil? make-nil))
> (define nil (make-nil))
> and thene export njil and nil? but not <i>ni> or make-nil.

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