Re: [Haskell-cafe] Not in scope

siso dagbovie wrote:

Hi,

I've defined the datatype:

data Graph a b = Empty | Context a b :& Graph a b

and the function

isEmpty :: Graph a b -> Bool isEmpty Empty = True isEmpty _ = False

and when I do a test run with the graph, ( [ ],2,'c',[("down",3)]) :& Empty

Haskell is bringing the message " Not in scope: data constructor `:&' " Why is that so?

This works for me. Are the definitions in the same file? Otherwise, you will need to import your definition. All the best, -- Jochem Berndsen | jochem@functor.nl GPG: 0xE6FABFAB