fwiw,  trying this in a new instance of JQt,  the first line worked fine, as you'd expect.
I then tried the rhs of the equivalence test:
((i. 5) +/ (5 * i. 500)) <@:{"1 _ yy =. 2500 $ 3 1 4 1 5 9x
and that was fine too.

But,  the session window hung and then terminated running this lhs,
(yx </. ({. , }.) yy)

Reducing the size of the arrays still fails to work unless one removes ({. , }.)
from the lhs!

So this works ok:
yx =. 10 ((* #) $ ]) 1 2 3 4 5
(yx </. yy) -: ((i. 5) +/ (5 * i. 10)) <@:{"1 _ yy =. 50 $ 3 1 4 1 5 9x
1

So I tried removing ({. , }.) from the lhs of the test with the original size arrays:
yx =. 500 ((* #) $ ]) 1 2 3 4 5
(yx </. yy) -: ((i. 5) +/ (5 * i. 500)) <@:{"1 _ yy =. 2500 $ 3 1 4 1 5 9x
1

JQt session stays open.

Needless to say (?),  ({. , }.) yy evidently runs without problem.

It seems that the ({. , }.) intervention does the damage!?!?

Cheers,

Mike






On 25/09/2018 01:09, David Mitchell wrote:
I was running the test cases on beta-k and found this test that terminated jconsole on windows 10:

   JVERSION
Engine: j807/j64/windows
Beta-k: commercial/2018-09-05T17:19:28
Library: 8.07.17
Platform: Win 64
Installer: J807 install
InstallPath: c:/users/me/downloads/j/j64-807
Contact: www.jsoftware.com

g421.ijs

   yx =. 500 ((* #) $ ]) 1 2 3 4 5
   (yx </. ({. , }.) yy) -: ((i. 5) +/ (5 * i. 500)) <@:{"1 _ yy =. 2500 $ 3 1 4 1 5 9x

1
(jconsole exits)

This test ran fine on Ubuntu Linux 64.

David Mitchell

On 9/6/2018 11:34, Eric Iverson wrote:
J807 beta-k is now available for window/linux/macos.

With luck this is the last beta and the final 807 will be released in early
October.

Please install and use! Problems found and fixed before the final release
will be to the benefit of the entire community.
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