new qualified operators

[Simon Marlow]

On 15/07/2010 13:46, Christian Maeder wrote:
> Hi,
>
> seeing
> http://www.haskell.org/ghc/docs/6.12.2/html/users_guide/syntax-extns.html#new-qualified-operators
>
> Could you add:
>
>    "Spaces are not allowed in new qualified operators!"
>
> For
>
> {-# LANGUAGE NewQualifiedOperators #-}
>
> f1 = (+)
> f2 = ( +)
> f3 = (+ )
> f4 = Prelude.(+)
> f5 = Prelude.( +)
> f6 = Prelude.(+ )
>
> f1 - f4 are ok, but f5 and f6 are rejected by ghc-6.12.3 with:
>
>    Not in scope: data constructor `Prelude'

Yes, it's really a bug, but it was difficult to make this consistent 
while retaining support for the old syntax.  I expect that we'll 
deprecate this extension anyway, since the Haskell 2010 committee 
rejected it as a proposal.

Cheers,
	Simon