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(.require
[library
[lux (.except)
["_" test (.only Test)]
[abstract
[monad (.only do)]]
[math
["[0]" random (.only Random)]]]]
[\\library
["[0]" / (.only)
["/[1]" // (.only)
["[1][0]" check]]]])
(type Super
(Ex (_ sub) [Text sub]))
(type Sub
(Super Bit))
(def .public test
Test
(<| (_.covering /._)
(all _.and
(_.coverage [/.Co]
(and (//check.subsumes? (type_literal (/.Co Super)) (type_literal (/.Co Sub)))
(not (//check.subsumes? (type_literal (/.Co Sub)) (type_literal (/.Co Super))))))
(_.coverage [/.Contra]
(and (//check.subsumes? (type_literal (/.Contra Sub)) (type_literal (/.Contra Super)))
(not (//check.subsumes? (type_literal (/.Contra Super)) (type_literal (/.Contra Sub))))))
(_.coverage [/.In]
(and (//check.subsumes? (type_literal (/.In Super)) (type_literal (/.In Super)))
(//check.subsumes? (type_literal (/.In Sub)) (type_literal (/.In Sub)))
(not (//check.subsumes? (type_literal (/.In Sub)) (type_literal (/.In Super))))
(not (//check.subsumes? (type_literal (/.In Super)) (type_literal (/.In Sub))))))
)))
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