Created
February 11, 2016 11:23
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Polymorphic recursion
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| import Prelude hiding (length) | |
| data Nested a = a :<: (Nested [a]) | Epsilon | |
| infixr 5 :<: | |
| nested = 1 :<: [2,3,4] :<: [[4,5],[7],[8,9]] :<: Epsilon | |
| length :: Nested a -> Int | |
| length Epsilon = 0 | |
| length (_ :<: xs) = 1 + length xs |
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