On Mar 16, 2010, at 17:03 , Vasyl Pasternak wrote:
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 ?
mtl is being deprecated (not just yet but soon); transformers is more general and provides the ability to support type families as well as functional dependencies (many folks believe type families are the future of Haskell, because functional dependencies are often difficult to understand). -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH