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CLtL (p68) is not explicit on its intent about whether (DEFVAR FOO) is
allowed to or intended to intialize FOO.
I believe that everyone's intent was that (DEFVAR FOO) should leave FOO
unbound. I would have sworn that the manual said this, but I guess it
Given that and the current syntax, there is the question of how the user
is supposed to supply a doc string for the variable if no initial
value is wanted. This was discussed in the past on one or two
occasions. I think the general feeling was that SETF of DOCUMENTAITON
was good enough in the rare case where this functionality is needed.
- From: David C. Plummer <DCP@QUABBIN.SCRC.Symbolics.COM>