(:from-end t) (:end sequence-end) (:key callable))
consed-sequence
(unsafely-flushable call)
:derive-type (sequence-result-nth-arg 1))
(defknown delete-duplicates
(:from-end t) (:end sequence-end) (:key callable))
consed-sequence
(unsafely-flushable call)
:derive-type (sequence-result-nth-arg 1))
(defknown delete-duplicates