I think what's happening in {{ a.=.'oops' }} is that the left hand
side of =. is being inspected during parsing (because literal
expressions are valid assignment targets), but J isn't prepared to
deal with some of the characters which are present in this context.
--
Raul
On Thu, Nov 2, 2023 at 6:07 PM Ian Clark <earthspo...@gmail.com> wrote:
>
> It does for me too on my Mac mini.
>
> JVERSION
>
> Engine: j903/j64/darwin
>
> Release-b: commercial/2022-01-28T04:07:40
>
> Library: 9.03.08
>
> Qt IDE: 1.9.5/5.15.2(5.15.2)
>
> Platform: Darwin 64
>
> Installer: J903 install
>
> InstallPath: /applications/j903
>
> Contact: www.jsoftware.com
>
>
> After the 3rd or 4th crash I actually got an Apple crash report. The whole
> thing is too long to insert here, but I have kept a copy.
> The key part IMHO is this:
>
> +++++++++++++++++++++++++++++++++++
> Notes:
> PC register does not match crashing frame (0x0 vs 0x115314C97)
>
> Crashed Thread: 0 Dispatch queue: com.apple.main-thread
>
> Exception Type: EXC_BAD_ACCESS (SIGSEGV)
> Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000028
> Exception Codes: 0x0000000000000001, 0x0000000000000028
>
> Termination Reason: Namespace SIGNAL, Code 11 Segmentation fault: 11
> Terminating Process: exc handler [1282]
>
> VM Region Info: 0x28 is not in any region. Bytes before following region:
> 140723209813976
> REGION TYPE START - END [ VSIZE] PRT/MAX
> SHRMOD REGION DETAIL
> UNUSED SPACE AT START
> --->
> mapped file 7ffcaceec000-7ffcd260c000 [599.1M] r-x/r-x
> SM=COW ...t_id=e024f55b
>
> Error Formulating Crash Report:
> PC register does not match crashing frame (0x0 vs 0x115314C97)
> +++++++++++++++++++++++++++++++++++
>
> AFAICT you can replace 'oops' with a string, name or numeral to get the
> crash. (Not tested extensively.)
>
>
> On Thu, 2 Nov 2023 at 21:33, Raul Miller <rauldmil...@gmail.com> wrote:
>
> > This reliably crashes J for me (all versions since j902, but j901
> > didn't support the {{ }} notation).
> >
> > {{ a.=.'oops' y }}
> >
> > FYI,
> >
> > --
> > Raul
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
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