Originally I posted this in error on the programming forum

Henry, thanks for all the work that you put into improving the language through 
subsequent betas.

I am away from my production computer, which has the different beta versions 
for j902, but I have found a difference between J901 and J902-f

   JVERSION
Engine: j901/j64avx2/darwin
Beta-m: commercial/2019-10-02T11:28:59
Library: 9.01.24
Qt IDE: 1.8.4/5.12.5
Platform: Darwin 64
Installer: J901 install
InstallPath: /users/bobtherriault/j901
Contact: www.jsoftware.com 

   (1 1 $ < 0) {:: 'a';'c'
a
  (3 1 $ <0){:: 'a';'b';'c'
aaa

Either of these lines will crash the entire session of j902-f
   JVERSION
Engine: j902/j64avx2/darwin
Beta-f: commercial/2020-09-24T12:49:44
Library: 9.02.05
Qt IDE: 1.8.7/5.12.7(5.12.7)
Platform: Darwin 64
Installer: J902 install
InstallPath: /users/bobtherriault/j902
Contact: www.jsoftware.com

Hope this helps. I will be back from vacation on Monday, but I can still do a 
little more investigation from my laptop if necessary.

Cheers, bob
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