When writing a haskell script, get syntax error near unexpected token

Question

When I write a simple script and pass it to runhaskell, it works fine, but not when I add a shebang and try executing it directly. The script is this:

#!/usr/local/bin/runhaskell

import Data.List (intercalate)

main :: IO ()
main = putStrLn $ intercalate " " $ map show [1..10]

If I try $ runhaskell count.hs bash prints 1 2 3 4 5 6 7 8 9 10 as expected, but if I try ./count.hs I get the following error:

./count.hs: line 3: syntax error near unexpected token `('
./count.hs: line 3: `import Data.List (intercalate)'

Is this error originating in bash or runhaskell? And how do I fix it?

Is that the correct path to runhaskell? Because that does look like a shell error. Is runhaskell itself a script with a shebang? What system/OS is this? — Etan Reisner
– Etan Reisner, Commented Sep 17, 2014 at 1:52

Community · Accepted Answer · 2017-05-23 11:59:20Z

9

Try using:

#!/usr/bin/env runhaskell
...

Note: this is a feature/issue with OSX where shebang interpreters are required to be binaries. See Shebang pointing to script (also having shebang) is effectively ignored for more details.

edited May 23, 2017 at 11:59

CommunityBot

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answered Sep 17, 2014 at 1:42

ErikR

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4 Comments

Ramith Jayatilleka Over a year ago

Thanks, that worked. But why? I did which runhaskell to get the path, and running /usr/local/bin/runhaskell count.hs in bash worked fine. How come it didn't work in the shebang?

Rufflewind Over a year ago

Not sure, but your code works fine on both my Linux systems (Debian with GHC 7.4 & Arch with GHC 7.8).

Carl Over a year ago

@RamithJayatilleka I'm willing to bet it has something to do with runhaskell being a shell script that calls ghc with some arguments.

ErikR Over a year ago

Added info on OSX behavior.

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