[stevekemp]

Note that there is a bug:

    10 PRINT "OK"
    20 GOTO 1

That reports an error "Cannot go to a nonexistant line". I think "real" BASIC interpreters would fall-through to the 10-line. I know my own toy BASIC does:

https://github.com/skx/gobasic

Edit: Have reported issue, so it doesn't get lost in this thread.

[James-Livesey]

Yeah, I've since fixed that bug when I saw it on GH Issues! Thanks for the bug report.