Checkdoc: Don't require a space before an arg list

See Bug#24998.

* lisp/emacs-lisp/checkdoc.el (checkdoc-defun-regexp): Don't require a
space before a argument list.
* test/lisp/emacs-lisp/checkdoc-tests.el (checkdoc-tests--bug-24998):
Add unit test.

2 files changed, 41 insertions, 1 deletions

diff --git a/lisp/emacs-lisp/checkdoc.el b/lisp/emacs-lisp/checkdoc.el
index 769c2fe5741..2c8bc020d38 100644
--- a/lisp/emacs-lisp/checkdoc.el
+++ b/lisp/emacs-lisp/checkdoc.el
@@ -296,7 +296,7 @@ problem discovered.  This is useful for adding additional checks.")
 
 (defvar checkdoc-defun-regexp
   "^(def\\(un\\|var\\|custom\\|macro\\|const\\|subst\\|advice\\)\
-\\s-+\\(\\(\\sw\\|\\s_\\)+\\)[ \t\n]+"
+\\s-+\\(\\(\\sw\\|\\s_\\)+\\)[ \t\n]*"
   "Regular expression used to identify a defun.
 A search leaves the cursor in front of the parameter list.")
 
diff --git a/test/lisp/emacs-lisp/checkdoc-tests.el b/test/lisp/emacs-lisp/checkdoc-tests.el
new file mode 100644
index 00000000000..18b5a499e08
--- /dev/null
+++ b/test/lisp/emacs-lisp/checkdoc-tests.el
@@ -0,0 +1,40 @@
+;;; checkdoc-tests.el --- unit tests for checkdoc.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2016  Free Software Foundation, Inc.
+
+;; Author: Google Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Unit tests for lisp/emacs-lisp/checkdoc.el.
+
+;;; Code:
+
+(require 'checkdoc)
+
+(require 'elisp-mode)
+(require 'ert)
+
+(ert-deftest checkdoc-tests--bug-24998 ()
+  "Checks that Bug#24998 is fixed."
+  (with-temp-buffer
+    (emacs-lisp-mode)
+    (insert "(defun foo())")
+    (should-error (checkdoc-defun) :type 'user-error)))
+
+;;; checkdoc-tests.el ends here