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13 lines
212 B
Idris
13 lines
212 B
Idris
data Natty : Nat -> Type where
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Z : Natty Z
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S : Natty n -> Natty (S n)
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view : (n: Nat) -> Natty n
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view Z = Z
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view (S n) = S (view n)
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id : Nat -> Nat
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id n with (view n)
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id _ | Z = Z
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id _ | S n = id _ | n
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