[Haskell-beginners] Exporting constructors

[Daniel Fischer]

On Thursday 24 March 2011 13:17:16, Patrick LeBoutillier wrote:
> Hi all,
> 
> Is it possible to export constructors from a module in a way that they
> can be used for pattern matching but not for creating types?
> 
> Patrick

No, that's impossible (as far as I know). If a constructor is exported, 
it's available for construction as well as for pattern matching.