# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 2019-12-12 23:48:48
# Node ID 287556e71f8530e2081784ca37e1cfd47f318113
# Parent  774cee0e95c6c738897e6ed1603b9062beb92840

export: use cmdutil.check_at_most_one_arg()

Differential Revision: https://phab.mercurial-scm.org/D7636

diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -2610,8 +2610,7 @@ def export(ui, repo, *changesets, **opts
     bookmark = opts.get(b'bookmark')
     changesets += tuple(opts.get(b'rev', []))
 
-    if bookmark and changesets:
-        raise error.Abort(_(b"-r and -B are mutually exclusive"))
+    cmdutil.check_at_most_one_arg(opts, b'rev', b'bookmark')
 
     if bookmark:
         if bookmark not in repo._bookmarks: