OCaml editing mode, require ocp-indent to work properly

ocaml.el

;;
;; OCaml mode
;;

(setq
 opam-share
 (substring
  (shell-command-to-string "opam config var share 2>/dev/null") 0 -1))

(setq load-path
 (append (list (concat opam-share "/emacs/site-lisp")) load-path))

(require 'merlin)
(require 'ocp-indent)
(setq merlin-command 'opam)
(setq merlin-use-auto-complete-mode 'easy)
(autoload 'tuareg-mode "tuareg" "Major mode for editing Caml code." t)
(autoload 'ocamldebug "ocamldebug" "Run the OCaml debugger" t)
(add-to-list 'auto-mode-alist '("\\.ml[iylp]?" . tuareg-mode))
(add-to-list 'auto-mode-alist '("\\.atd$" . tuareg-mode))
(autoload 'tuareg-imenu-set-imenu "tuareg-imenu" "Configuration of imenu for tuareg" t)
(dolist (ext '(".cmo" ".cmx" ".cma" ".cmxa" ".cmi"))
  (add-to-list 'completion-ignored-extensions ext))

(add-hook
 'tuareg-mode-hook
 (lambda ()
   (abbrev-mode)
   (merlin-mode)

   (setq tab-width 2)
   (setq indent-tabs-mode t)
   (setq tab-always-indent nil)

   (setq hs-hide-comments-when-hiding-all nil)
   (tuareg-imenu-set-imenu)
   (define-key tuareg-mode-map "\C-x\C-r" 'replace-regexp)
   (define-key tuareg-mode-map [(control down)] 'tuareg-next-phrase)
   (define-key tuareg-mode-map [(control up)] 'tuareg-previous-phrase)
   (define-key tuareg-mode-map [(meta down)] 'tuareg-next-phrase)
   (define-key tuareg-mode-map [(meta up)] 'tuareg-previous-phrase)
   (when (require 'hideshow nil t)
     (unless (assq 'tuareg-mode hs-special-modes-alist)
       (add-to-list
	'hs-special-modes-alist
	`(tuareg-mode
	  ,(concat "^" tuareg-definitions-regexp)
	  ,tuareg-semicolon-match-stop-regexp
	  nil ;; nil means to use `comment-start'
	  (lambda (_arg)
	    (tuareg-next-phrase t nil)
	    (tuareg-skip-back-blank-and-comments))
	  nil))))
  (when (featurep 'hideshow)
     (hs-minor-mode 1)
     (require 'fold-dwim))
   ))