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From: massar@think.ARPA (J.P. Massar)
Newsgroups: net.lang.lisp
Subject: Re: Lisp Question
Message-ID: <1653@think.ARPA>
Date: Sat, 18-May-85 12:34:35 EDT
Article-I.D.: think.1653
Posted: Sat May 18 12:34:35 1985
Date-Received: Sun, 19-May-85 06:21:57 EDT
References: <394@gitpyr.UUCP>
Reply-To: massar@think.UUCP (J.P. Massar)
Distribution: net
Organization: Thinking Machines, Cambridge, MA
Lines: 22

In article <394@gitpyr.UUCP> scott@gitpyr.UUCP (Scott Holt) writes:
> >  ( defun myfunction ( p-list ) ( eval body ) )
>     myfunction
>
>           then later
>
>>   ( setq body '( car p-list ) )
>     (car p-list)
>>   ( myfunction '(a b c d))
>     a

In Common Lisp this will not work because the eval function evaluates
its argument in the null lexical environment (Common Lisp, p 321, Guy
Steele).  Since plist is only bound in the lexical environment of
myfunction this should result in an UNBOUND VARIABLE or similar error
instead of evaluating to 'a'.

In fact, using Kyoto Common Lisp this is exactly what happens.

-- 
-- JP Massar, Thinking Machines Corporation, Cambridge, MA
-- mit-eddie!godot!massar, ihnp4!godot!massar, massar@think, massar@cca-unix