;; emacs 24.3 had a buggy which-function-mode that was really slow, so
;; only load which-function-mode on 24.4 and later.
(if (and (>= emacs-major-version 24)
         (>= emacs-minor-version 4))
    (progn
      (which-function-mode)
      (add-to-list 'which-func-modes 'python-mode)
      (add-to-list 'which-func-modes 'emacs-lisp-mode)
      (add-to-list 'which-func-modes 'go-mode)))