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13 lines
397 B
Idris
13 lines
397 B
Idris
twice : Char -> Char -> Char -> Char -> Nat -> (Nat, Nat)
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twice w x y z Z = (Z, Z)
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twice m n o p (S x)
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= case twice m n o p x of
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(a, b) => (S a, S b)
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bothS : Int -> String -> (Nat, Nat) -> (Nat, Nat)
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bothS test dummy = \(c, d) => (S c, S d)
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pf : (x : Nat) -> twice 'a' 'b' 'c' 'd' (S x)
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= bothS 99 "red balloons" (twice 'a' 'b' 'c' 'd' x)
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pf k = Refl -- Refl
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