I was making a quick example of a dependent type that wasn't a Vect, and accidentally implemented extensible records. http://lpaste.net/104020
@aloiscochard @jonsterling It's a limited form of type inference. Probably best avoided in general, but handy here.
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@edwinbrady@jonsterling actually HList was the *exact* reason I was afraid of not having it... I'm very happy to see it's actually doable.Thanks. Twitter will use this to make your timeline better. UndoUndo
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