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Nice one. Explains why many people love and use C.

Well, this kind of thing is even easier in the Lisps, in all reality. Your can connect to the live repl and redefine any identifier at runtime.

This has been used to good effect on a few spacecraft, IIRC.

Homoiconicity makes this kind of problem much easier, it is true. I remember the story of the spacecraft realtime patch too, fondly!