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