Writing output results in parse error

[bokesan]

Parsing the output from forked processes fails when you do output yourself, e.g.:

main = do putStrLn "Hello!"
          mainWith (do ...

will fail with

program: Prelude.read: no parse

I don't think that this necessarily needs to be fixed, but it certainly should be documented.

[chrisdone]

Perhaps a cheap solution is to write the output to a temp file, rather than communicate via pipe.

[chrisdone]

I put in a more descriptive error message for now.

[chrisdone]

I changed it to write to a temporary file instead in 0.0.4.