[Haskell] Annoying naming clashes

[Ben.Yu at combined.com]

> Don't export your data constructors because you then expose the
> internals of your module, which is bad for abstraction; export function
> names which serve as the data constructors instead.

Actually this is another thing that I'm wondering about.

it is nice to use 'maybe', 'either' functions. However, with data types
with more than 2 constructors, using such function tends to be tedious than
pattern match, where, you can pick specific constructors of interest.

And in order to use pattern match, I have to expose my constructors.




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