Sign-indexed Peano numbers
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| Language | Haskell |
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| Owner | rightfold |
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| Modified | |
| Visibility | Public |
{-# LANGUAGE DataKinds, GADTs, KindSignatures #-}
data Sign = Zero | Pos
data Nat :: Sign -> * where
Z :: Nat Zero
S :: Nat a -> Nat Pos
divide :: Nat a -> Nat Pos -> Nat a
divide = error "exercise for the reader"
main :: IO ()
main = return ()
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