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{-# LANGUAGE CPP, TypeApplications #-}
#include "MachDeps.h"
module Main where
import Control.Exception
import Numeric.Natural
ok :: Natural -> IO ()
ok n | fromEnum n == i = putStrLn "OK"
| otherwise = putStrLn errmsg
where
i = fromIntegral n
errmsg = ("fromEnum " ++) . shows n . (" == " ++) . shows i $ ": BAD"
bad :: Natural -> IO ()
bad n = do
r <- try @ErrorCall . evaluate $ fromEnum n
case r of
Left _ ->
putStrLn "Exception thrown as expected."
Right _ ->
putStrLn $
("fromEnum " ++) . shows n $ ": Exception not thrown when expected."
main :: IO ()
main = do
let sizem2 = WORD_SIZE_IN_BITS - 2 :: Int
sizem1 = WORD_SIZE_IN_BITS - 1 :: Int
size = WORD_SIZE_IN_BITS :: Int
sizep1 = WORD_SIZE_IN_BITS + 1 :: Int
mapM_ ok
[ 0
, 2 ^ sizem2
, 2 ^ sizem1 - 1
]
mapM_ bad
[ 2 ^ sizem1
, 2 ^ size - 1
, 2 ^ size
, 2 ^ size + 2 ^ sizem1
, 2 ^ sizep1 - 42
, 2 ^ sizep1
]
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