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Message from discussion Implementation Favoritism, a question of Lisp mindsets
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Tim Bradshaw  
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 More options May 4 2003, 4:24 pm
Newsgroups: comp.lang.lisp
From: Tim Bradshaw <t...@cley.com>
Date: 04 May 2003 20:55:11 +0100
Local: Sun, May 4 2003 3:55 pm
Subject: Re: Implementation Favoritism, a question of Lisp mindsets
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* Fred Gilham wrote:
> So a variable is "unbound" when Lisp looks at the binding (note, for
> the sake of argument I didn't say "looks in the binding") and finds
> bottom.

Well, specifically, a lexical variable binding can never have no value
associated with it, while a dynamic binding can (witness PROGV).  The
spec is explicit about this somewhere.  I presume the (or a) reason is
efficiency - a lexical binding is likely to be compiled away to a much
greater extent than a dynamic one. There's no way of finding out if a
lexical binding exists, either (other than the obvious: is it
lexically visible...)

--tim


 
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