Fix compiler warnings about some Gnus functions

emacs/.emacs.d/init.el

@@ -563,10 +563,7 @@ MODE1 is enabled and vice-versa."
 
 (oni:add-hooks 'gnus-summary-mode-hook
   (lambda ()
-    (local-set-key (kbd "M-d") (lambda ()
+    (local-set-key (kbd "M-d") 'oni:gnus-delete-forward)))
-                                 (interactive)
-                                 (gnus-summary-delete-article)
-                                 (gnus-summary-next-subject 1)))))
 
 (oni:add-hooks 'html-mode-hook
   'oni:maybe-fci-mode #'tagedit-mode #'turn-off-flyspell

emacs/.emacs.d/site-lisp/oni-gnus.el

@@ -0,0 +1,37 @@
+;;; oni-gnus.el --- Extra functions and commands for Gnus  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2016  Tom Willemse
+
+;; Author: Tom Willemse <tom@ryuslash.org>
+;; Keywords:
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(require 'gnus-sum)
+
+;;;###autoload
+(defun oni:gnus-delete-forward ()
+  "Delete the article under point and move to the next one."
+  (interactive)
+  (gnus-summary-delete-article)
+  (gnus-summary-next-subject 1))
+
+(provide 'oni-gnus)
+;;; oni-gnus.el ends here