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bug#15778: 24.3; cperl-mode causes emacs to lock up


From: Nathan Trapuzzano
Subject: bug#15778: 24.3; cperl-mode causes emacs to lock up
Date: Sun, 03 Nov 2013 17:50:41 -0500
User-agent: Gnus/5.130007 (Ma Gnus v0.7) Emacs/24.3.50 (gnu/linux)

Stephen Berman <address@hidden> writes:

> Ah, then it works, i.e. C-k kills the line and Emacs doesn't infloop.

I thought so.

Can someone apply the patch to trunk?  It's attached here again.

>From 0b73932e90496e0477eddce6ba7e87d2137cb730 Mon Sep 17 00:00:00 2001
From: Nathan Trapuzzano <address@hidden>
Date: Sun, 3 Nov 2013 08:44:36 -0500
Subject: [PATCH] * progmodes/cperl-mode.el
 (cperl-font-lock-fontify-region-function): Don't infloop when expanding
 region over `multiline' syntax-type that begins a line. (Bug#15778)

---
 lisp/ChangeLog               | 7 +++++++
 lisp/progmodes/cperl-mode.el | 5 +++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 6a91465..b047b57 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2013-11-03  Nathan Trapuzzano  <address@hidden>
+
+       * progmodes/cperl-mode.el
+       (cperl-font-lock-fontify-region-function): Don't infloop when
+       expanding region over `multiline' syntax-type that begins a line.
+       (Bug#15778)
+
 2013-11-02  Glenn Morris  <address@hidden>
 
        * Makefile.in (EMACS): Use a relative filename.
diff --git a/lisp/progmodes/cperl-mode.el b/lisp/progmodes/cperl-mode.el
index 8a7d1e7..36b05c8 100644
--- a/lisp/progmodes/cperl-mode.el
+++ b/lisp/progmodes/cperl-mode.el
@@ -8900,8 +8900,9 @@ do extra unwind via `cperl-unwind-to-safe'."
                  (beginning-of-line)
                  (eq (get-text-property (setq beg (point)) 'syntax-type)
                      'multiline)))
-      (if (setq beg (cperl-beginning-of-property beg 'syntax-type))
-         (goto-char beg)))
+      (let ((new-beg (cperl-beginning-of-property beg 'syntax-type)))
+       (setq beg (if (= new-beg beg) nil new-beg))
+       (goto-char new-beg)))
     (setq beg (point))
     (goto-char end)
     (while (and end
-- 
1.8.4.2


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