some->

Nested when/let can be converted to some→

;;; Don't
(when-let [x1 (f0 x0)]
  (when-let [x2 (f1 x1)]
    (when-let [x3 (f2 x2)]
      (f3 x3))))
 
;;; Do
(some-> x0 f0 f1 f2 f3)

;;; Don't
(let [x (if (nil? x) nil (x f0))
      x (if (nil? x) nil (x f1))
      x (if (nil? x) nil (x f2))]
  (if (nil? x) nil (f3 x)))
 
;;; Do
(some-> x0 f0 f1 f2 f3)