FUNCALL question - comp.lang.lisp

Message from discussion FUNCALL question

Erann Gat

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More options Feb 3 1990, 4:47 am

Newsgroups: comp.lang.lisp

From: g...@robotics.Jpl.Nasa.Gov (Erann Gat)

Date: 2 Feb 90 17:28:24 GMT

Local: Fri, Feb 2 1990 12:28 pm

Subject: Re: FUNCALL question

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In article <2...@papaya.bbn.com>, b...@bbn.com (Hunter Barr) writes:
> You wouldn't want
> to (UN-DEFVAR *PRINT-BASE*) would you? Now that *would* cause some
> problems.

I see your point. I guess my real gripe is that there is no way to
guarantee that a given variable is lexically scoped. I would like
to be able to do something like:

(let ((x 1)) (declare (lexical x)) ...

but CL has no such declaration. Granted, if you use the star convention
(and everyone else on your Lisp machine uses it too) then you probably
won't have problems. (This 'solution' is strongly reminiscent of the
FORTRAN convention of having all variables beginning with I,J,K,L,M or
N be integers.) However, the way things stand, one careless mistake or
ignorant user can require a LONG time to fix. (One day long ago I
typed (defvar x 1) as part of a quick experiment on a TI Explorer
and for the next few days no one could understand why their code
suddenly didn't work. Then someone rebooted the machine and all the
problems mysteriously vanished.)

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