[Hugs-users] Network.CGI missing in Hugs

[Claus Reinke]

>- The existing module used undecidable instances, a Haskell extension  
>which is supported by GHC but not by Hugs. 

??

as far as i recall, Hugs was the first Haskell implementation to bite the
bullet and accept undecidable instances as a design option (although its
predecessor apparently also had the undecidability feature).

http://cvs.haskell.org/Hugs/pages/users_guide/class-extensions.html

are you thinking of interactions with other extensions, perhaps?

claus