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{-# LANGUAGE ConstraintKinds #-} | |
{-# LANGUAGE DeriveTraversable #-} | |
{-# LANGUAGE FlexibleContexts #-} | |
{-# LANGUAGE LambdaCase #-} | |
{-# LANGUAGE RankNTypes #-} | |
{-# LANGUAGE ScopedTypeVariables #-} | |
{-# LANGUAGE TypeFamilies #-} | |
import Control.Monad | |
import Control.Monad.Except |