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Example of overloading if-then-else in Haskell

View RebindableIf.hs
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{-# LANGUAGE RebindableSyntax #-}
 
import Prelude
 
data Height = Tall | Short
 
class IfThenElse b where
ifThenElse :: b -> a -> a -> a
 
instance IfThenElse Bool where
ifThenElse True t _ = t
ifThenElse False _ f = f
 
instance IfThenElse Height where
ifThenElse Tall t _ = t
ifThenElse Short _ f = f
 
main = do
putStrLn $ if Tall then "A" else "B"
putStrLn $ if False then "C" else "D"
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