The Report quite deliberately does not allow you to write
the type constructors for built-in syntax in import or export lists.
The idea is that the types
[Int]
and [] Int
always mean "list of Int" regardless of what module fiddling
you have done. So [] is not an ordinary type constru
20 Sep 2001 12:37:36 -0600, Alastair David Reid <[EMAIL PROTECTED]> pisze:
>> Ah, I forgot that you can't export a constructor on its own.
>
> You can't?
>
> I probably knew this once but looking at it now, it seems kinda
> surprising. Haskell's module system is supposed to be just namespace
Thu, 20 Sep 2001 13:32:54 +0100, Simon Marlow <[EMAIL PROTECTED]> pisze:
> (:) is allowed in an export list; it is just a normal operator.
Not quite, it's a reservedop. "Notice that a colon by itself, ":",
is reserved solely for use as the Haskell list constructor; this
makes its treatment unifo
It's hard to distinguish a constructor from a class in an
export list.
S
| -Original Message-
| From: Alastair David Reid [mailto:[EMAIL PROTECTED]]
| Sent: 20 September 2001 19:38
| To: Simon Marlow
| Cc: Ian Lynagh; [EMAIL PROTECTED]; [EMAIL PROTECTED]
| Subject: Re: Prelud
> Ah, I forgot that you can't export a constructor on its own.
You can't?
I probably knew this once but looking at it now, it seems kinda
surprising. Haskell's module system is supposed to be just namespace
control --nothing more-- so why is it preventing me from doing something
which is per
Ian Lynagh writes:
> On Thu, Sep 20, 2001 at 01:32:54PM +0100, Simon Marlow wrote:
> > (:) is allowed in an export list; it is just a normal operator.
>
> An export is
>
> export -> qvar
>| qtycon [(..) | ( qcname1 , ... , qcnamen )] (n>=0)
>| qtycls [(..) | ( qvar1 , ... , q
On Thu, Sep 20, 2001 at 01:32:54PM +0100, Simon Marlow wrote:
>
> > As far as I can tell, the report doesn't allow (:) or []((:),
> > []) in the
> > export list, yet the hugs prelude has the first and the GHC
> > prelude has
> > the second. Have I missed something that allows them or is
> > th
> As far as I can tell, the report doesn't allow (:) or []((:),
> []) in the
> export list, yet the hugs prelude has the first and the GHC
> prelude has
> the second. Have I missed something that allows them or is
> this a bug in
> the preludes or the report?
(:) is allowed in an export list;
