Forward-compatible MonadFail class
This package contains the Control.Monad.Fail module providing
the MonadFail class that became available in
base-4.9.0.0 for older base package versions.
This package turns into an empty package when used with GHC versions
which already provide the Control.Monad.Fail module to make way
for GHC's own Control.Monad.Fail module.