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shigemk2/empty.hs

Created April 1, 2015 11:33
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empty.hs
-- 結合性
infixr 5 :-:
data List a = Empty | a :-: (List a) deriving (Show, Read, Eq, Ord)
main = do
print $ 3 :-: 4 :-: 5 :-: Empty
let a = 3 :-: 4 :-: 5 :-: Empty
print $ 100 :-: a
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