Re: [Haskell-cafe] Constraints at construction

On Thu, Oct 9, 2008 at 3:05 PM, Mitchell, Neil wrote:

Hi Iain,

The wiki page has quite a nice article: http://www.haskell.org/haskellwiki/Smart_constructors

Smart constructors are nice but if your module doesn't also export the regular constructor then you can't pattern match against it. It would be cool if there was a way to export constructors from a module, but only for use in pattern matching and not constructing new values. Peace, Bit