/usr/lib/s9fes/help/memp is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 | S9 LIB (memp procedure^2 object list) ==> list | #f
Find the first tail X of LIST for which
(procedure^2 object (car X))
holds. When no such tail exists, return #F.
(memp char=? #\b '(#\a #\b #\c)) ==> (#\b #\c)
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