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22 lines
406 B
Idris
22 lines
406 B
Idris
module CoverBug
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import Data.So
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public export
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data FastNat : Type where
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MkFastNat : (val : Integer) -> {auto 0 prf : So True} -> FastNat
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prv1 : Integer -> (x : Integer ** So $ True)
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prv1 x =
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case choose True of
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Left prf => (x ** Oh)
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Right noprf => absurd noprf
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fromInteger : Integer -> FastNat
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fromInteger v =
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let (v ** p) = prv1 $ v
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in MkFastNat v
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doit : FastNat -> FastNat
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doit 0 = 0
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