Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2017-06-20T16:08:51Z

This is probably caused by that error. Which version of Emacs are you using?

Original Redmine Comment
Author Name: Victor Lau
Original Date: 2017-06-20T16:13:55Z

GNU Emacs 22.3.1 (x86_64-suse-linux-gnu, X toolkit, Xaw3d scroll bars)
of 2015-03-23 on sheep22

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2017-06-20T16:19:00Z

You're stuck in 2009? :)

Anyhow, try this patch, if it works I'll commit it, I don't have that old of a version around to try it with.

diff --git a/verilog-mode.el b/verilog-mode.el
index d938f11..e779266 100644
--- a/verilog-mode.el
+++ b/verilog-mode.el
@@ -344,6 +344,12 @@ wherever possible, since it is slow."
        (unless (fboundp 'buffer-chars-modified-tick)  ; Emacs 22 added
         (defmacro buffer-chars-modified-tick () (buffer-modified-tick)))
      (error nil))
+  ;; Added in Emacs 23.1
+  (condition-case nil
+      (unless (fboundp 'ignore-errors)
+        (defmacro ignore-errors (&rest body)
+          (declare (debug t) (indent 0))
+          `(condition-case nil (progn ,@body) (error nil)))))
    ;; Added in Emacs 24.1
    (condition-case nil
        (unless (fboundp 'prog-mode)

Original Redmine Comment
Author Name: Victor Lau
Original Date: 2017-06-20T16:43:05Z

I test it with version emacs 25.1. It works. Thanks.

Original Redmine Comment
Author Name: Victor Lau
Original Date: 2017-06-20T16:55:44Z

Your Patch work with my aging company default version 22.3.1
:)
Please commit your changes. Thanks again!

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2017-06-20T17:01:30Z

Committed to git as 2017-06-20-42e1d15-vpo.

Original Redmine Comment
Author Name: Kaushal Modi
Original Date: 2017-06-20T18:33:43Z

@victor While you are updating emacs, please update to emacs 25.2 as that's a bug fix release following 25.1.