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COMEFROM is one of the many great jokes that form the Intercal language. I recommend reading the language specification.

Of course, COMEFROM's grown up (and very real) sibling is ALTER GOTO in COBOL.

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So I tracked down this programming manual for intercal https://3e8.org/pub/intercal.pdf and can't locate any mention to comefrom.

It is from a dialect called C-INTERCAL and is written with a space: 'COME FROM'

https://www.cs.virginia.edu/~asb/teaching/cs415-fall05/docs/...

Thanks for that correction! I had memorized COME FROM as part of the original Intercal. My mistake.

It's also foundational in Threaded INTERCAL, where "multiple COME FROM statements with the same label cause the program to fork separate threads at each COME FROM":

https://esolangs.org/wiki/Threaded_INTERCAL

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