[Haskell-cafe] parse error on input `&'

[siso dagbovie]

Hi,

I've defined the following datatype with haskell

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

But I am having the error message: " parse error on input `&'  ".
I am wondering what it is wrong with my definition. How can I fix this?
Thanks in advance.


Kind regards


      
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