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(.module:
[library
[lux "*"
["_" test {"+" [Test]}]
[abstract
[monad {"+" [do]}]]
[control
["[0]" io {"+" [IO]}]
[concurrency
["[0]" async]]]
[math
["[0]" random]
[number
["n" nat]]]]]
[\\library
["[0]" /]])
(/.capability: (Can_Shift a)
(can_shift [a Nat] [a Nat]))
(/.capability: Can_IO
(can_io [] (IO Nat)))
(def: .public test
Test
(<| (_.covering /._)
(do random.monad
[shift random.nat
base random.nat
.let [expected (n.+ shift base)]
pass_through (random.ascii 1)]
(_.for [/.Capability]
($_ _.and
(_.cover [/.capability: /.use]
(let [capability (..can_shift (function (_ [no_op raw])
[no_op (n.+ shift raw)]))
[untouched actual] (/.use capability [pass_through base])]
(and (same? pass_through untouched)
(n.= expected actual))))
(in (let [capability (..can_io (function (_ _) (io.io expected)))]
(do async.monad
[actual (/.use (/.async capability) [])]
(_.cover' [/.async]
(n.= expected actual)))))
)))))
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