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* Fred Gilham wrote:Well, specifically, a lexical variable binding can never have no value
> 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
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
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