Re: [Haskell-cafe] odd problem with export list of System.IO

1 Mar 2009

      Johan Tibell ha scritto:
...
On Sun, Mar 1, 2009 at 3:07 PM, Manlio Perillo  wrote:
...
Hi.
Maybe I'm missing something, but I don't understand why the following
program:
module Main where
import System.IO (Handle, withFile, ReadMode)
You want to import IOMode(..), not ReadMode. The latter is a data
constructor of the IOMode type.
import System.IO (Handle, withFile, IOMode(ReadMode))

solved the problem, thanks.

However, why individual data constructors of the IOMode type are not 
exported?

Thanks  Manlio