CONTEXT: [env_single_windows] valid environment with single windows mounted
RETCODE=2
STDOUT:
=======

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STDERR:
=======
usage: bt-dualboot [-h] [--version] [-l] [--list-win-mounts] [--bot]
                   [--dry-run] [--win MOUNT] [--sync MAC [MAC ...]]
                   [--sync-all] [-n] [-b [path]]
bt-dualboot: error: `--sync-all` can't be used alongside with `--sync MAC`

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