verify: I: check: deadlock: ok
verify: I: check: unreachable: ok
verify: I: check: livelock: ok
verify: I: check: deterministic: ok
verify: J: check: deadlock: ok
verify: J: check: unreachable: ok
verify: J: check: livelock: ok
verify: J: check: deterministic: ok
verify: illegal_external_requires_twice: check: deterministic: ok
verify: illegal_external_requires_twice: check: illegal: fail
error: illegal action performed in model illegal_external_requires_twice
model: illegal_external_requires_twice
p.e
q.e
q.return
r.e
r.return
p.return
q.a
<illegal>
verify: illegal_external_requires_twice: check: deadlock: ok
verify: illegal_external_requires_twice: check: unreachable: skip
verify: illegal_external_requires_twice: check: livelock: ok
verify: illegal_external_requires_twice: check: compliance: skip
