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040000 tree c8dc87eb8d64353f19cd50dd1874286444d9a96f	futures.promise
040000 tree 500bd6603ee3cca3071b3bf361ca823676ec6b9f	futures.shared_future
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040000 tree 7ca46d1f97ef42161748120799685e1e4d8caa99	futures.unique_future