Simon Peyton-Jones writes:

| This is where I find ghc's newtype deriving to be incredibly useful. ... Aha! I've always wondered whether anyone uses this feature, which I implemented at John Hughes's suggestion. I'd be interested to know if you are alone, or whether others do so too.

I think there were a few times where I would have used it, had I known about it. -- David Menendez | "In this house, we obey the laws http://www.eyrie.org/~zednenem | of thermodynamics!"