[Haskell-cafe] parse error on input `&'
daniel.is.fischer at web.de
Sat Apr 25 13:36:50 EDT 2009
Am Samstag 25 April 2009 19:29:30 schrieb siso dagbovie:
> 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.
A constructor symbol has to start with a colon, so make it
data Graph a b = Empty | Context a b :& Graph a b
(or :&: if you prefer it more symmetric)
> Kind regards
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