(require 'rustic-flycheck)
;; Adds (/tmp/test/foo /tmp/test) unless native-compiled
;; Segfaults when native-compiled
(message "%s" (rustic-flycheck-dirs-list "/tmp/test/foo" "/tmp"))

;; The code
;; (defun rustic-flycheck-dirs-list (start end)
;;   "Return a list of directories from START (inclusive) to END (exclusive).
;; E.g., if START is '/a/b/c/d' and END is '/a', return the list
;; '(/a/b/c/d /a/b/c /a/b) in this order.
;; START and END are strings representing file paths.  END should be
;; above START in the file hierarchy; if not, the list stops at the
;; root of the file hierarchy."
;;   (let ((dirlist)
;;         (dir (expand-file-name start))
;;         (end (expand-file-name end)))
;;     (while (not (or (equal dir (car dirlist)) ; avoid infinite loop
;;                     (file-equal-p dir end)))
;;       (push dir dirlist)
;;       (setq dir (directory-file-name (file-name-directory dir))))
;;     (nreverse dirlist)))