(char-before): Use the byte-optimaization.

diff --git a/lisp/dgnushack.el b/lisp/dgnushack.el
index 4d36b57..8a34c44 100644 (file)
--- a/lisp/dgnushack.el
+++ b/lisp/dgnushack.el
@@ -216,10 +216,13 @@
 (condition-case nil
     (char-before)
   (wrong-number-of-arguments
-   (define-compiler-macro char-before (&whole form &optional pos)
-     (if (null pos)
+   ;; Optimize byte code for `char-before'.
+   (put 'char-before 'byte-optimizer 'byte-optimize-char-before)
+   (defun byte-optimize-char-before (form)
+     (if (null (cdr form))
         '(char-before (point))
-       form))))
+       form))
+   ))
 
 ;; `char-after' and `char-before' must be well-behaved before lpath.el
 ;; is loaded.  Because it requires `poe' via `path-util'.