import bool
import or

(true | false) => c

expect c

---

import bool
import or

(true | true) => c

expect c

---

import bool
import or

(true | true) => c

expect c

---

import bool
import or

(false | false) => c

don't expect c

---

proc {
  unless bla:
    blubb
  unless blubb:
    test
}

expect blubb
don't expect test