On Wed, Jul 13, 2011 at 10:31 AM, Bertram Felgenhauer
Antoine Latter wrote:
If you give the module a new name in the new package then the old module can re-export all of the symbols in the new module.
In GHC I don't think there is a way for two packages to export the same module and have them be recognized as the same thing, as far as I know.
Right, but you don't have to rename the module if you use the PackageImports extension. (Incidentally, this used by the haskell2010 ibrary, which is implemented in terms of base)
http://haskell.org/ghc/docs/latest/html/users_guide/syntax-extns.html#packag...
So the following should work, assuming 'original' is a package exporting the Foo.Bar module.
{-# LANGUAGE PackageImports #-} module Foo.Bar (module Original) where
import "original" Foo.Bar as Original
Best regards,
Bertram
The downside to this approach is that anyone trying to use the module in GHCi (or use the module in a non-Cabal setting) will need to manually hide one of the packages. Does anyone know if there is a way to make Cabal auto-hide a package after install without too much trickery? That might be more than you want to do. Antoine
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe