* lisp/progmodes/cperl-mode.el (cperl-font-lock-fontify-region-function):

Don't infloop when expanding region over `multiline' syntax-type that
begins a line.

Fixes: debbugs:15778

1 files changed, 3 insertions, 2 deletions

diff --git a/lisp/progmodes/cperl-mode.el b/lisp/progmodes/cperl-mode.el
index 8a7d1e77bd2..36b05c89ea1 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