(vc-register): Clean error message if no visited file.

1 files changed, 2 insertions, 0 deletions

diff --git a/lisp/vc.el b/lisp/vc.el
index 54f71fb0d93..c68973505e8 100644
--- a/lisp/vc.el
+++ b/lisp/vc.el
@@ -640,6 +640,8 @@ merge in the changes into your working copy."
   "Register the current file into your version-control system."
   (interactive "P")
   (let ((master (vc-name buffer-file-name)))
+    (or buffer-file-name
+        (error "No visited file"))
     (and master (file-exists-p master)
          (error "This file is already registered"))
     (and master