prettyPreAcc pp alvl wrap (Scanl' f e acc)
  = wrap 
  $ prettyArrOp "scanl'" [parens (prettyPreFun pp alvl f), prettyPreExp pp 0 alvl parens e,
                          pp alvl parens acc]
prettyPreAcc pp alvl wrap (Scanl' f e acc)
  = wrap 
  $ prettyArrOp "scanl'" [parens (prettyPreFun pp alvl f), prettyPreExp pp 0 alvl parens e,
                          pp alvl parens acc]
prettyPreAcc pp alvl wrap (Scanl' f e acc)
  = wrap 
  $ prettyArrOp "scanl'" [parens (prettyPreFun pp alvl f), prettyPreExp pp 0 alvl parens e,
                          pp alvl parens acc]