File: memp

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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)