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diff --git a/app/CMark/Extra.hs b/app/CMark/Extra.hs
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+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+module CMark.Extra where
+
+import CMark
+import Data.Binary (Binary)
+
+-- TODO Generic-derived Binary instances might be slow
+--
+-- https://github.com/kolmodin/binary/issues/200
+--
+-- @backlog
+instance Binary Node
+
+instance Binary PosInfo
+
+instance Binary NodeType
+
+instance Binary ListAttributes
+
+instance Binary ListType
+
+instance Binary DelimType