verify: ihello: check: deadlock: ok
verify: ihello: check: unreachable: ok
verify: ihello: check: livelock: ok
verify: ihello: check: deterministic: ok
verify: iworld: check: deadlock: ok
verify: iworld: check: unreachable: ok
verify: iworld: check: livelock: ok
verify: iworld: check: deterministic: ok
verify: illegal_optional: check: deterministic: ok
verify: illegal_optional: check: illegal: fail
error: illegal action performed in model illegal_optional
model: illegal_optional
h.hello
w.hello
w.return
h.return
w.cruel
w.hello
<illegal>
verify: illegal_optional: check: deadlock: ok
verify: illegal_optional: check: unreachable: skip
verify: illegal_optional: check: livelock: ok
verify: illegal_optional: check: compliance: skip
