Empty Datatypes in GHC 5?

[Ashley Yakeley]

I just joined this list after finally obtaining an i386 machine primarily 
for the purpose of running GHC (I ssh/ftp to it from my Mac).

A quick question: is there an option to allow empty datatypes in GHC 
5.00? I couldn't see one in the manual. They are useful for type 
parameterisation, for instance:

 data Zero;
 data Succ n;

Unfortunately this is contrary to the Haskell Report. Nevertheless, Hugs 
allows it. But GHC, apparently, does not.

-- 
Ashley Yakeley, Seattle WA