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{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
{-# LANGUAGE ImplicitParams, RankNTypes #-}
-- This program failed to typecheck in an early version of
-- GHC with impredicative polymorphism, but it was fixed by
-- doing pre-subsumption in the subsumption check.
-- Trac bug #821
module ShouldCompile where
type PPDoc = (?env :: Int) => Char
f :: Char -> PPDoc
f = succ
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