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From: lewis@rocky.STANFORD.EDU (Bil Lewis)
Newsgroups: comp.emacs
Subject: Re: GNU emacs on a 3B2
Message-ID: <675@rocky.STANFORD.EDU>
Date: Thu, 15-Oct-87 15:35:37 EDT
Article-I.D.: rocky.675
Posted: Thu Oct 15 15:35:37 1987
Date-Received: Sat, 17-Oct-87 18:04:49 EDT
References: <806@mrstve.UUCP>
Organization: Stanford University Computer Science Department
Lines: 45
In-reply-to: rjk@mrstve.UUCP's message of 15 Oct 87 01:22:18 GMT

Posting-Front-End: GNU Emacs 18.36.1 of Fri Feb  6 1987 on rocky (berkeley-unix)



R,

  Re: your second point.

  Sure enough, your definition wouldn't work too well.  Consider:

(defun push (item ref) (setq ref (cons item ref)))
=> push
(setq foo nil)
=> nil
(push 5 foo)
=> (5)
foo
=> nil


	What you've actually done is change the value of the locally
bound variable ref.  What you WANT is to change foo.  push must be a
macro.  It's actually defined in cl.el, but here's a simple def:

(defmacro push (item ref) (list 'setq ref (list 'cons item ref)))
=> push
(push 5 foo)
==> (setq foo (cons 5 foo))
=> (5)
foo
=> (5)


  Right?

  Now, the REAL question, why doesn't the def of push get loaded?  Well,
what you have to do is to compile rnews.el with the definition of push
loaded.  Afterwards, when the compiled file is loaded, push will already
be expanded, so you won't need the definition of push around.  Got
that?

(load-file "cl.el")
(byte-compile-file "rnews.el")

ought to do the trick.

-Bil
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