>> Yeah, I should have been clearer about that. A list *node* is a union. A
>> tree *node* is a union.
>
>    What would the harm be if eg. list nodes were structs instead?

Perhaps I should elaborate further:

I'm not attempting to argue that unions are such a fundamental feature 
that every programming language should have them. I'm just pointing out 
that *in Haskell* they are extremely fundamental. Which, clearly, is a 
different statement.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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