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dorchard/gist:8d726882bb3cdbb5bd44e8ffc14e0ff4

Created August 10, 2016 09:58
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type families for extra information on pretty printer
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gistfile1.txt
class Pretty t where
type ExtraInfo t
pprint :: FortranVersion -> t -> ExtraInfo t -> Doc
instance Pretty (Expression a) where
type ExtraInfo (Expression a) = ()
pprint v e () = ...
instance Pretty (Block a) where
type ExtraInfo (Block a) = Int -- indent level
pprint v e i = ...
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