On 2002.02.18 11:11:08 +0000 Simon Marlow wrote:

...

There is a difference between hugs and ghc in how they treat imports with the '(..)' notation. Here's my example:

module CTree( --other stuff Const(..) ) where

import ATree (Const)

--const has constructors CInt, CChar, CStr

under hugs this module exports CInt, CChar, CStr but under ghc it does not. Under ghc it only exports the constructors if I import 'Const' like this:

import ATree (Const(..))

I don't know which is the right behaviour w.r.t. the H98 standard, but it 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*.

I just tested this with the hugs December 2001 version and it still exhibits this behaviour. Hopefully this can be added to some 'bug list' somewhere. Duncan