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{-# OPTIONS_GHC -XTypeFamilies #-}
-- Trac #3346
module Foo where
class EP a where
type Result a
from :: a -> Result a
to :: Result a -> a
{-# RULES "rule1" forall x. to (from x) = x #-}
{-# RULES "rule2" forall x. from (to x) = x #-}
foo :: EP a => a -> a
-- This is typed in a way rather similarly to RULE rule1
foo x = to (from x)
bar x = from (to x)
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