verify: deadlock_optional_out_only: check: deadlock: fail
error: deadlock in model deadlock_optional_out_only
model: deadlock_optional_out_only
<deadlock>
verify: deadlock_optional_out_only: check: unreachable: skip
verify: deadlock_optional_out_only: check: livelock: ok
verify: deadlock_optional_out_only: check: deterministic: ok
