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14 lines
382 B
Idris
14 lines
382 B
Idris
-- Reduction of https://gist.github.com/AlgebraicWolf/0d921915d7aca032e35831c73c8d04f4
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-- See Discord discussion for further context:
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-- https://discord.com/channels/827106007712661524/954409815088721920/1108129142756606102
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data X : Nat -> Type where
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IZ : X Z
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IS : (0 n : _) -> X n -> X (S n)
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g : (m : Nat) -> X m -> Nat
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g (S m@(S m')) (IS .(S m') k) = g (S m') k
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g _ _ = 0
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