Hi Manlio
2009/1/15 Manlio Perillo
Note that it seems you have sent this message only to me; I'm sending the reply to both you and the mailing list.
Yes, sorry, I always forget forwading to the mailing list. :(
By the way, here is a strange (for me) problem I hit, and made me think about this extension.
Suppose a file foo.hs defines:
import Control.Monad import System.Posix.Files as PF
isDirectory :: FilePath -> IO Bool isDirectory path = PF.isDirectory `liftM` PF.getFileStatus path
If I try to load the file from ghci I get:
Prelude> :l foo.hs [1 of 1] Compiling Main ( foo.hs, interpreted ) Ok, modules loaded: Main. *Main> isDirectory "/var"
<interactive>:1:0: Ambiguous occurrence `isDirectory' It could refer to either `Main.isDirectory', defined at foo.hs:6:0 or `PF.isDirectory', imported from System.Posix.Files at foo.hs:2:0-30
That's exactly the problem of "function call hi-jacking". [1] In Haskell it's solved using qualified imports. Cheers, Artyom Shalkhakov. [1] http://digitalmars.com/d/2.0/hijack.html