~/.emacs.d: Enable rust's flycheck stuff

.emacs.d/init.el

             (put-clojure-indent 'DELETE '(:defn))
             (put-clojure-indent 'ANY '(:defn))))
(add-hook 'flycheck-mode-hook #'flycheck-rust-setup)
;; (require 'recentf)
;; (recentf-mode 1)
;; (setq recentf-keep '(("\\.txt\\'") ("\\.md\\'")))