FailureT-15321.1: Control/Monad/Failure/Class.hs

module Control.Monad.Failure.Class where

class Monad m => MonadFailure f m where {
  fail :: f -> m a;
};

class MonadFailure f m => MonadSalvage f m where {
  save :: (f -> m a) -> m a -> m a;
};