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ekmett / contravariant

Haskell 98 contravariant functors
http://hackage.haskell.org/package/contravariant
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Contravariant instances for Alt, monad transformers #14

Closed RyanGlScott closed 9 years ago

RyanGlScott commented 9 years ago

This pull request adds Contravariant instances for Alt (introduced in base-4.8.0.0) and the monad transformer types from transformers.