bug

Article View: comp.sys.xerox

Article #50

#50

From: "Steven J. Clark"
Date: Thu, 10 Aug 1989 15:22

16 lines
970 bytes

I just found an interesting bug in CL:MAKE-ARRAY.  Suppose you do

(SETQ dims '(2 4 6))
(SETQ array (CL:MAKE-ARRAY dims))
(RPLACA dims 1)

What do you suppose (CL:ARRAY-DIMENSIONS array) returns?  Do you think
you'll get an index out of bound error on (CL:AREF array 1 2 3)?

The work-around is pretty obvious:  call (CL:MAKE-ARRAY (APPEND dims)).
Nevertheless, this is very definitely a bug.  I have not investigated
what happens if you destructively modify the list returned by
CL:ARRAY-DIMENSIONS nor if it is EQ to the list you give CL:MAKE-ARRAY,
but I suspect there could be more trouble there as well.

Steve Clark "The happy hacker"

Technical Details

Message-ID: <8908101522.AA07499@vax3.iti.org>

Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucbvax!VAX3.ITI.ORG!sjc

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucbvax!VAX3.ITI.ORG!sjc
From: sjc@VAX3.ITI.ORG ("Steven J. Clark")
Newsgroups: comp.sys.xerox
Subject: bug
Message-ID: <8908101522.AA07499@vax3.iti.org>
Date: 10 Aug 89 15:22:23 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 16