The error reporting on the Arcade devices is very limited at the moment. I was just surprised to see a
980 error on some code compiled with
5.21.14. I can look this up on https://arcade.makecode.com/device/error-codes and it tells me it’s a
980 (PANIC_CAST_FROM_UNDEFINED): attempted cast from an undefined value to another type. I’ve not seen that before and it wasn’t obvious from the position in the game what code was executing.