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14 lines
281 B
Idris
14 lines
281 B
Idris
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isSingleton : Bool -> Type
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isSingleton True = Nat
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isSingleton False = List Nat
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mkSingle : (x : Bool) -> isSingleton x
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mkSingle True = 0
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mkSingle False = []
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sum : (single : Bool) -> isSingleton single -> Nat
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sum True x = x
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sum False [] = 0
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sum False (x :: xs) = x + sum False xs
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