Re: [Haskell-cafe] What unsafeInterleaveIO is unsafe

On Sun, 15 Mar 2009, Claus Reinke wrote:

import Data.IORef import Control.Exception

main = do r <- newIORef 0 let v = undefined handle (\(ErrorCall _)->print "hi">>return 42) $ case f v of 0 -> return 0 n -> return (n - 1) y <- readIORef r print y

I don't see what this has to do with strictness. It's just the hacky "exception handling" which allows to "catch" programming errors.