File: TH_repGuard.hs

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{-# LANGUAGE TemplateHaskell #-}
module Main
where

import Language.Haskell.TH
import System.IO

$(
  do ds <- [d|
        foo :: Int -> Int
        foo x
         | x == 5 = 6
        foo x = 7
      |]
     runIO $ do { putStrLn (pprint ds); hFlush stdout }
     return ds
 )

$(
  do ds <- [d|
        bar :: Maybe Int -> Int
        bar x
         | Just y <- x = y
        bar _ = 9
      |]
     runIO $ do { putStrLn (pprint ds) ; hFlush stdout }
     return ds
 )

main :: IO ()
main = do putStrLn $ show $ foo 5
          putStrLn $ show $ foo 8
          putStrLn $ show $ bar (Just 2)
          putStrLn $ show $ bar Nothing