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20 lines
293 B
Idris
20 lines
293 B
Idris
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data Wrap : Type -> Type where
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MkWrap : a -> Wrap a
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unwrap : Wrap a -> a
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unwrap (MkWrap v) = v
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data F : Type where
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MkF : Wrap (Not F) -> F
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yesF : Not F -> F
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yesF = MkF . MkWrap
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notF : Not F
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notF (MkF f) = unwrap f (yesF $ unwrap f)
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argh : Void
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argh = notF (yesF notF)
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