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-- This module should run fine with an empty argument list
-- But it won't if the strictness analyser thinks that 'len' is use
-- strictly, which was the case in GHC 6.0
-- See the io_hack_reqd in GHC.Core.Opt.DmdAnal
module Main where
import System.Environment
import System.Exit
main = do
args <- getArgs
let len = read (head args) :: Int
(if null args && useLazily len
then putStrLn "ok" >> exitWith ExitSuccess
else return () )
print len
useLazily :: Int -> Bool
useLazily len = ([len,3,4] !! 1) == 3
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