From: Markus Triska <triska@gmx.at>
Subject: Re: Finding Unused Identifiers
Date: Thu, 02 Mar 2006 18:18:05 +0100 [thread overview]
Message-ID: <440728cc$0$8024$3b214f66@tunews.univie.ac.at> (raw)
In-Reply-To: <1YDNf.5345$F56.2416@newsread3.news.atl.earthlink.net>
Hi!
B. T. Raven wrote:
> by "unused" do you mean something other than unbound?
I took it to mean "(at least) one write access (set, let, ...), and no
read access".
> Why can't the file be loaded
Consider:
(let ((a 0))
(complicated-function) ; not involving a
(print a))
If "complicated-function" halts, a is (subsequently) used. If it
doesn't, a remains unused (the "print" part is never reached). Since
whether a Lisp function halts is undecidable, there's no algorithm that
always both terminates and correctly identifies all such identifiers in
arbitrary programs.
All the best,
Markus.
next prev parent reply other threads:[~2006-03-02 17:18 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-02 13:31 Finding Unused Identifiers August Karlstrom
2006-03-02 14:07 ` Markus Triska
2006-03-02 15:13 ` B. T. Raven
2006-03-02 17:18 ` Markus Triska [this message]
2006-03-02 22:25 ` August Karlstrom
2006-03-03 8:39 ` Peter Tury
2006-03-03 11:25 ` Pascal Bourguignon
2006-03-03 13:31 ` Markus Triska
2006-03-04 2:21 ` Pascal Bourguignon
2006-03-04 15:20 ` Markus Triska
2006-03-04 19:19 ` August Karlstrom
2006-03-05 3:15 ` August Karlstrom
2006-03-05 15:13 ` Markus Triska
2006-03-05 16:05 ` August Karlstrom
2006-03-08 18:43 ` Kevin Rodgers
[not found] ` <mailman.88.1141843635.2832.help-gnu-emacs@gnu.org>
2006-03-09 13:08 ` August Karlstrom
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