blob: 20f4225907c12bbaa6fe56328f86c011ec377822 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
|
{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, KindSignatures,
GADTs, FlexibleInstances, FlexibleContexts #-}
module T5591b where
class Monad m => Effect p e r m | p e m -> r where
fin :: p e m -> e -> m r
data ErrorEff :: * -> (* -> *) -> * where
CatchError :: (e -> m a) -> ErrorEff ((e -> m a) -> m a) m
instance Monad m => Effect ErrorEff ((e -> m a) -> m a) a m where
fin (CatchError h) = \f -> f h
|
