Does this also fix the _.&". bug in this old report?
http://www.jsoftware.com/jwiki/System/Interpreter/Bugs#nanwon.27tdo
If so, do you prefer reports on the Forums instead of the Wiki?
-Dan
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Roger Hui
Sent: Thursday, March 18, 2010 11:08 AM
To: Programming forum
Subject: Re: [Jprogramming] A J phrase which crashes Java on the iMac
The crash in _.".'circ' has now been fixed for the next release.
Thank you for finding and reporting this error.
----- Original Message -----
From: Ian Clark <[email protected]>
Date: Thursday, March 18, 2010 3:57
Subject: Re: [Jprogramming] A J phrase which crashes Java on the iMac
To: Programming forum <[email protected]>
> Yes, Roger, that was my attitude with Adaytum Planning, when Ellis
> Morgan and I recorded: "only a fool would do that!" in a voice
> dripping with scorn -- and it actually got shipped in a release! I'll
> lend you the WAV if you like :-)
>
> And yes - I did read the warnings. But I guess I unconsciously
> distinguish between features whose results are unreliable and those
> which compromise integrity by permitting a hard crash with legal
> usage. With all due respect I have to ask: is Indeterminate (_.) a
> supported feature, or an unsupported forensic side-effect that just
> happens to be documented in Voc? A prominent warning there that
> it can
> crash J would be nice. So would a domain error when (_.) is used as
> the left arg to Numbers (".)
>
> (_.) would be a useful facility (at least I think so) were it
> safe to
> use, as I imagine Infinity (_) is. I'm porting a calculator from APL
> in which every number can take the pseudo-values UNDEFINED or INVALID
> -- and there is some pervasive and very cumbersome code to support
> this. So far I've been able to dispense with it all -- it was a major
> reason for porting to J. But if I can't trust (_.".) when
> applied to
> raw user input then I'm going to have to bring some of it back.
>
> I do appreciate that when it comes to supporting "_." it might have
> been a bridge too far. All I really want is to report a loophole
> enabling an over-creative user to crash J. I'd also like to know
> whether it happens on other platforms. Apple (Snow Leopard)
> seems to
> accept that it's Java that crashes -- and it's Sun's problem to fix
> it.
>
> Ian
>
>
> On Thu, Mar 18, 2010 at 12:02 AM, Roger Hui <[email protected]>
> wrote:> It comes from deliberately using _. despite warnings
> against it.
> >
> >
> >
> > ----- Original Message -----
> > From: Ian Clark <[email protected]>
> > Date: Wednesday, March 17, 2010 16:44
> > Subject: [Jprogramming] A J phrase which crashes Java on the iMac
> > To: Programming forum <[email protected]>
> >
> >> _.". 'circ'
> >>
> >> ...causes a hard crash of J on the iMac which loses all J-related
> >> evidence but results in a bug report being mailed off to Apple.
> >> The report is headed: J quit unexpectedly while using the
> >> libj.dylib plugin.
> >>
> >> There's no facility for stopping the report being sent, so I've
> >> spammed Apple trying to investigate a capricious bug in my
> >> application, which turns out to be all down to this.
> >>
> >> The string 'circ' can be replaced by: 'circl', 'chur', and (many?)
> >> words beginning 'chur'. Strangely, 'circle' works ok as expected.
> >>
> >> Is anyone curious as to how someone might stumble upon a bug
> >> like this?
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