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Re: A value for "nothing"

From: Matt Wette
Subject: Re: A value for "nothing"
Date: Mon, 27 Aug 2018 17:50:14 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Is it reasonable to expect that if a value can be assigned to a variable
then a predicate exists to test for that value type?  So, if

  (define a (if #f #f))

does not signal an error then there should be a predicate to indicate the
value associated with a is unspecified?

If the define allowed in RnRS?  I don't believe there is a predicate to
test for this. (I could be wrong.)



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