Terrific, thanks for the explanation Tillmann! Ranjit.

On Monday, March 2, 2015 at 3:46:59 PM UTC-8, Tillmann Rendel wrote:
>
> Hi, 
>
> Ranjit Jhala wrote: 
> > To be precise: I get the below error when my code is: 
> > 
> > main ::IO () 
> > main = do tgt <-readFile "dist/PANDOC" 
> >           putStrLn $ "Pandoc TARGET: "++tgt 
> >           txFigHtml 
> > 
> > but everything works fine if I remove the first two lines (i.e. just use 
> > `txFigHtml`) ? 
>
> Your program is run as a filter by pandoc, so everything your program 
> prints to the the standard output stream (stdout) will get redirected to 
> pandoc. Including whatever `putStrLn $ "Pandoc TARGET: "++tgt` prints. 
> Pandoc doesn't know how to understand that information, of course, so 
> you get a (not really satisfying) error message. 
>
> To print some debugging information to the user, try the standard error 
> stream (stderr): 
>
> > import System.IO (hPutStrLn, stderr); 
> > ... 
> > hPutStrLn stderr $ "Pandoc TARGET: " ++ tgt 
>
>    Tillmann 
>

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