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The `Pretty' type

This is the pretty-printer that is currently used in GHC: 
type Pretty

ppShow          :: Int{-width-} -> Pretty -> [Char]

pp'SP           :: Pretty -- "comma space"
ppComma         :: Pretty -- ,
ppEquals        :: Pretty -- =
ppLbrack        :: Pretty -- [
ppLparen        :: Pretty -- (
ppNil           :: Pretty -- nothing
ppRparen        :: Pretty -- )
ppRbrack        :: Pretty -- ]
ppSP            :: Pretty -- space
ppSemi          :: Pretty -- ;

ppChar          :: Char -> Pretty
ppDouble        :: Double -> Pretty
ppFloat         :: Float -> Pretty
ppInt           :: Int -> Pretty
ppInteger       :: Integer -> Pretty
ppRational      :: Rational -> Pretty
ppStr           :: [Char] -> Pretty

ppAbove         :: Pretty -> Pretty -> Pretty
ppAboves        :: [Pretty] -> Pretty
ppBeside        :: Pretty -> Pretty -> Pretty
ppBesides       :: [Pretty] -> Pretty
ppCat           :: [Pretty] -> Pretty
ppHang          :: Pretty -> Int -> Pretty -> Pretty
ppInterleave    :: Pretty -> [Pretty] -> Pretty -- spacing between
ppIntersperse   :: Pretty -> [Pretty] -> Pretty -- no spacing between
ppNest          :: Int -> Pretty -> Pretty
ppSep           :: [Pretty] -> Pretty
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