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Memory access bug with negative subscripts

X-seq: zsh-workers 23695
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: zsh-workers@xxxxxxxxxx
Subject: Memory access bug with negative subscripts
Date: Tue, 24 Jul 2007 21:52:22 -0700
Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm

This bug appears at least as far back as zsh 3.0.5, and probably longer
ago.  Still happens in the latest CVS co from SourceForge.

x=x
x[-10]=y
print $x

I can't predict what you'll see, but unless you get very lucky it won't
be what you ought to see.  For example,

torch% x[-$RANDOM]=z
torch% print $x
zpasswd

I imagine running that under ElectricFence or some similar memory checker
would be instructive.

Follow-Ups:
- Re: Memory access bug with negative subscripts
  - From: Peter Stephenson

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