hugs / ghc difference over '(..)' imports

[Simon Marlow]

> There is a difference between hugs and ghc in how they treat=20
> imports with the=20
> '(..)' notation. Here's my example:
>=20
> module CTree(
> 	--other stuff
> 	Const(..)
>    ) where
>=20
> import ATree (Const)
>=20
> --const has constructors CInt, CChar, CStr
>=20
> under hugs this module exports CInt, CChar, CStr
> but under ghc it does not. Under ghc it only exports the=20
> constructors if I=20
> import 'Const' like this:
>=20
> import ATree (Const(..))
>=20
> I don't know which is the right behaviour w.r.t. the H98=20
> standard, but it=20
> tripped me up.

GHC is correct here.  According to the Haskell 98 report C(..) exports C =
and all its constructors *that are currently in scope*.

Cheers,
	Simon