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Re:Running Lisp in Production (2015) by rjsw on Sunday May 24, 2020 @08:17PM (#23296248)
I would guess that there was a feature :nil defined in the NIL [1] system.

[1] https://en.wikipedia.org/wiki/NIL_(programming_language)

Re:Running Lisp in Production (2015) by TeMPOraL on Monday May 25, 2020 @04:16AM (#23299124)
That must be it, thanks!