diff options
Diffstat (limited to 'lisp/vc/diff.el')
| -rw-r--r-- | lisp/vc/diff.el | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lisp/vc/diff.el b/lisp/vc/diff.el index 469888078c4..b7f17bf3c73 100644 --- a/lisp/vc/diff.el +++ b/lisp/vc/diff.el @@ -258,6 +258,8 @@ This requires the external program `diff' to be in your `exec-path'." (interactive "bBuffer: ") (let ((buf (get-buffer (or buffer (current-buffer))))) (with-current-buffer (or (buffer-base-buffer buf) buf) + (unless buffer-file-name + (error "Buffer is not visiting a file")) (diff buffer-file-name (current-buffer) nil 'noasync)))) ;;;###autoload |