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15 lines
348 B
Idris
15 lines
348 B
Idris
record Pack (a : Type) where
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constructor MkPack
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nested : a
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nat : Nat
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proj : List (Pack Bool) -> List (Bool, Nat)
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proj [] = []
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proj (x :: xs) = MkPair x.nested (nat x) :: proj xs
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ununpack : List (Pack (Pack a)) -> List a
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ununpack = map (.nested.nested)
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deepNats : List (Pack (Pack a)) -> List Nat
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deepNats = map ((.nat) . (.nested))
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