[Haskell-cafe] Re: A GHC error message puzzle

[Simon Marlow]

On 12/08/10 15:09, Yitzchak Gale wrote:
> The file "error_puzzle.hs" begins like this:
>
> main = do
>    inp<- readFile "input"
>    writeFile "output" $ process inp
>
> process :: String ->  String
>
> When compiled with GHC 6.12.3 and run, it
> gives the following result:
>
> $ ./error_puzzle
> error_puzzle: output: hClose: illegal operation (handle is finalized)

process xs = blackhole where blackhole = tail blackhole

Cheers,
	Simon