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Okay. So some updates.

It turns out loops (BEGIN..UNTIL) are a "premium" Forth feature and are only available inside functions. So I need to wrap the whole program in a : function ; . Well not the whole program, not the VARIABLEs, and I don't think you can nest the functions, and… never mind. I do the nest. New code:

https://github.com/mcclure/aoc2024/tree/85890d80d89ebe82df779e20607f78cd4275f8db

gforth fails with :

src/puzzle.f:38: Invalid memory address

I wrapped my program in a : run [code here] ; run . Line 38 is "run".

I'm still lost.