[ clisp-Bugs-1420855 ] DESTRUCTURING-BIND does not work properly on infinite lists

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

Bugs item #1420855, was opened at 2006-01-31 20:30
Message generated for change (Settings changed) made by haible
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=101355&aid=1420855&group_id=1355

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: clisp
Group: ANSI compliance issue
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Nathan Froyd (nfroyd)
Assigned to: Bruno Haible (haible)
Summary: DESTRUCTURING-BIND does not work properly on infinite lists

Initial Comment:
Transcript of a session with CLISP 2.38:

[1]> (defvar *vars* '#1=(a b c d e . #1#))
*VARS*
[2]> (destructuring-bind (a b c d e &rest ignore) *vars*
       (list a b c d e))

Expected: (A B C D E)
Got: "*** - <: NIL is not a real number" (as an error
message, of course)

----------------------------------------------------------------------

>Comment By: Bruno Haible (haible)
Date: 2006-04-18 16:51

Message:
Logged In: YES 
user_id=5923

Fixed in CVS. Thanks for the report: it was not only a bug 
(for circular lists), it was also a performance problem (for 
long proper lists). 

----------------------------------------------------------------------

Comment By: JÃ¶rg HÃ¶hle (hoehle)
Date: 2006-02-01 17:44

Message:
Logged In: YES 
user_id=377168

Confirmed.  This surprises me even more so since I recently
looked at the code to see whether it would work with
non-proper lists (it must work, and does work with dotted
lists) and did not see that other fault.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=101355&aid=1420855&group_id=1355