RFC: Adding a Hashable type class and HashMap/HashSet data types to HP

[Bryan O'Sullivan]

On Fri, Nov 26, 2010 at 5:59 PM, Thomas Schilling
<nominolo at googlemail.com>wrote:

> This is what I had in mind: https://gist.github.com/717475


Cute. Of course (<>) suggests that you use a Monoid instance instead and
drop the special operator :-)
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