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-rw-r--r--lisp/vc/vc-src.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/vc/vc-src.el b/lisp/vc/vc-src.el
index b780161d5dd..49c799c44e1 100644
--- a/lisp/vc/vc-src.el
+++ b/lisp/vc/vc-src.el
@@ -295,7 +295,7 @@ If LIMIT is non-nil, show no more than this many entries."
(when limit (list "-l" (format "%s" limit)))
vc-src-log-switches)))))
-(defun vc-src-diff (files &optional oldvers newvers buffer)
+(defun vc-src-diff (files &optional _async oldvers newvers buffer)
"Get a difference report using src between two revisions of FILES."
(let* ((firstfile (car files))
(working (and firstfile (vc-working-revision firstfile))))