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(all (E R) (-> (list-t E) R (-> R E R) R))
Left fold over the list.
(list-fold-left (@list 1 2 3 4) 0 iadd) ;; => 10 (list-fold-left (@list 1 2 3 4) (@list) (swap cons)) ;; => (@list 4 3 2 1)