[Haskell-cafe] How to define instance for type synonym with parameter.

Vasyl Pasternak vasyl.pasternak at gmail.com
Tue Mar 16 17:03:51 EDT 2010

> Aren't ErrorT and ReaderT instances of Applicative already? (At least in
> 'transformers' package?)

what difference between 'mtl' and 'transformers' packages ? 'mtl' goes
with Haskell Platform as standard package, so what is the benefit of
'transformers' library ?


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