I've found an error, but cannot reproduce it in the clean session. The problem line (simplfied) is:
follows=. heads ($@0:)`(~.@,@(] S: 0)@[)`]}&; (, a:) I've prepended it by the line: heads__=: heads to debug after that code breaks. So, session log looks like: ========================================== load 'app.ijs' run_problem_verb '' ... |length error | follows=. heads ($@0:)`(~.@,@(]S:0)@[)`]}&; , a: heads ($@0:)`(~.@,@(] S: 0)@[)`]}&; (, a:) NB. try to reproduce using noun from app: error is reproduced |length error | heads ($@0:)`(~.@,@(]S:0)@[)`]}&;(,a:) heads2=. , a: heads -:!.0 heads2 1 heads2 ($@0:)`(~.@,@(] S: 0)@[)`]}&; (, a:) NB. try to reproduce using identical noun: error isn't reproduced heads ($@0:)`($@0:@~.@,@(] S: 0)@[)`]}&; (, a:) NB. replace generated ISO value by identical value: error isn't reproduced, too ($0) -:!.0 ~.@,@(] S: 0)@[ heads NB. what generated ISO value is 1 JVERSION Engine: j807/j64/linux Release-a: commercial/2019-01-11T11:05:56 Library: 8.07.22 Platform: Linux 64 Installer: J807 install InstallPath: /home/user/j64-807 Contact: www.jsoftware.com ========================================== So, 'head' noun copied from app breaks code, but identical fresh noun 'head2' doesn't. If the value generated from 'heads' is replaced by identical value ($0), this avoids error. -- Regards, Igor ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
