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-rw-r--r--lisp/vc/vc-rcs.el4
1 files changed, 2 insertions, 2 deletions
diff --git a/lisp/vc/vc-rcs.el b/lisp/vc/vc-rcs.el
index 940d967d68b..c9e4d409924 100644
--- a/lisp/vc/vc-rcs.el
+++ b/lisp/vc/vc-rcs.el
@@ -565,10 +565,10 @@ files beneath it."
(vc-rcs-print-log-cleanup))
(when limit 'limit-unsupported))
-(defun vc-rcs-diff (files &optional oldvers newvers buffer)
+(defun vc-rcs-diff (files &optional async oldvers newvers buffer)
"Get a difference report using RCS between two sets of files."
(apply #'vc-do-command (or buffer "*vc-diff*")
- 1 ;; Always go synchronous, the repo is local
+ (if async 'async 1)
"rcsdiff" (vc-expand-dirs files)
(append (list "-q"
(and oldvers (concat "-r" oldvers))