At start-up defs that DON'T type check are permitted (so you can use e.g.
loop, map, etc.) in the definitions "source", but then the user-facing
inscribe command only allows you to define new commands that DO
type-check. The ideal solution here is to get inference working for the
loopy words. (In the meantime you can select and execute their
definition text directly. That's not (yet!) type-checked.)
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