[Haskell-cafe] Newtype derivation understanding problem
k-bx at k-bx.com
Thu Jul 31 10:55:32 UTC 2014
Excuse me if the question is silly.
Thought this MonadCatchIO will be removed in next version of snap, current
version has it and I can't understand this derivation: 
L.Lensed seems like just a newtype wrapper around a function , and there
is no instance of MonadCatchIO for a function.
How is it derived?
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