(defun filesets-filter-list (lst cond-fn)
"Remove all elements not conforming to COND-FN from list LST.
COND-FN takes one argument: the current element."
(defun filesets-filter-list (lst cond-fn)
"Remove all elements not conforming to COND-FN from list LST.
COND-FN takes one argument: the current element."