verify: iworld: check: deadlock: ok
verify: iworld: check: unreachable: ok
verify: iworld: check: livelock: ok
verify: iworld: check: deterministic: ok
verify: variant_out: check: deterministic: ok
verify: variant_out: check: illegal: ok
verify: variant_out: check: deadlock: fail
error: invariant violation in model variant_out
model: variant_out
h.hello
w.hello
w.return
h.return
w.cruel
<invariant>
verify: variant_out: check: unreachable: skip
verify: variant_out: check: livelock: ok
verify: variant_out: check: compliance: skip
