I was playing around with an advent of code question and fat-fingered a $: instead of $ and the J session hung, repeatable on my machine.
$: (2 1 _3, 1 _8 0,3 _6 1,:2 0 4) NB. Hangs J session Here's the JVERSION: JVERSION Engine: j901/j64avx2/windows Beta-s: commercial/2019-12-02T12:53:00 Library: 9.01.13 Qt IDE: 1.8.4/5.12.5 Platform: Win 64 Installer: J901 install InstallPath: c:/users/lettoke/j901 Contact: www.jsoftware.com Thanks, Ken ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
