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+haskell-MonadCatchIO-mtl (Monad-transformer version of haskell-mtl)
+
+Provides a monad-transformer version of the Control.Exception.catch
+function. For this, it defines the MonadCatchIO class, a subset of
+MonadIO. It defines proper instances for most monad transformers in
+the mtl library.
+
+This requires haskell-mtl.