1 files changed, 8 insertions, 0 deletions

diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index 31d21fd8720..de749e1d0c8 100644
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -3148,6 +3148,7 @@ That command is designed for interactive use only" fn))
 
 ;; more complicated compiler macros
 
+(byte-defop-compiler char-before)
 (byte-defop-compiler list)
 (byte-defop-compiler concat)
 (byte-defop-compiler fset)
@@ -3159,6 +3160,13 @@ That command is designed for interactive use only" fn))
 (byte-defop-compiler19 (/ byte-quo) byte-compile-quo)
 (byte-defop-compiler19 nconc)
 
+(defun byte-compile-char-before (form)
+  (cond ((= 2 (length form))
+         (byte-compile-form `(char-after (1- ,(nth 1 form)))))
+        ((= 1 (length form))
+         (byte-compile-form '(char-after (1- (point)))))
+        (t (byte-compile-subr-wrong-args form "0-1"))))
+
 (defun byte-compile-list (form)
   (let ((count (length (cdr form))))
     (cond ((= count 0)