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diff --git a/src/Text/Pandoc/Lua/Orphans.hs b/src/Text/Pandoc/Lua/Orphans.hs
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+{-# OPTIONS_GHC -fno-warn-orphans #-}
+{-# LANGUAGE FlexibleInstances    #-}
+{- |
+   Module      : Text.Pandoc.Lua.Orphans
+   Copyright   : © 2012-2021 John MacFarlane
+                 © 2017-2021 Albert Krewinkel
+   License     : GNU GPL, version 2 or above
+
+   Maintainer  : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
+   Stability   : alpha
+
+Orphan instances for Lua's Pushable and Peekable type classes.
+-}
+module Text.Pandoc.Lua.Orphans () where
+
+import Data.Version (Version)
+import HsLua
+import HsLua.Module.Version (peekVersionFuzzy)
+import Text.Pandoc.Definition
+import Text.Pandoc.Lua.Marshal.AST
+import Text.Pandoc.Lua.Marshal.CommonState ()
+import Text.Pandoc.Lua.Marshal.Context ()
+import Text.Pandoc.Lua.Marshal.PandocError()
+import Text.Pandoc.Lua.Marshal.ReaderOptions ()
+import Text.Pandoc.Lua.Marshal.Sources (pushSources)
+import Text.Pandoc.Lua.ErrorConversion ()
+import Text.Pandoc.Sources (Sources)
+
+instance Pushable Pandoc where
+  push = pushPandoc
+
+instance Pushable Meta where
+  push = pushMeta
+
+instance Pushable MetaValue where
+  push = pushMetaValue
+
+instance Pushable Block where
+  push = pushBlock
+
+instance {-# OVERLAPPING #-} Pushable [Block] where
+  push = pushBlocks
+
+instance Pushable Alignment where
+  push = pushString . show
+
+instance Pushable CitationMode where
+  push = pushCitationMode
+
+instance Pushable Format where
+  push = pushFormat
+
+instance Pushable ListNumberDelim where
+  push = pushString . show
+
+instance Pushable ListNumberStyle where
+  push = pushString . show
+
+instance Pushable MathType where
+  push = pushMathType
+
+instance Pushable QuoteType where
+  push = pushQuoteType
+
+instance Pushable Cell where
+  push = pushCell
+
+instance Peekable Cell where
+  peek = forcePeek . peekCell
+
+instance Pushable Inline where
+  push = pushInline
+
+instance {-# OVERLAPPING #-} Pushable [Inline] where
+  push = pushInlines
+
+instance Pushable Citation where
+  push = pushCitation
+
+instance Pushable Row where
+  push = pushRow
+
+instance Pushable TableBody where
+  push = pushTableBody
+
+instance Pushable TableFoot where
+  push = pushTableFoot
+
+instance Pushable TableHead where
+  push = pushTableHead
+
+-- These instances exist only for testing. It's a hack to avoid making
+-- the marshalling modules public.
+instance Peekable Inline where
+  peek = forcePeek . peekInline
+
+instance Peekable Block where
+  peek = forcePeek . peekBlock
+
+instance Peekable Meta where
+  peek = forcePeek . peekMeta
+
+instance Peekable Pandoc where
+  peek = forcePeek . peekPandoc
+
+instance Peekable Row where
+  peek = forcePeek . peekRow
+
+instance Peekable Version where
+  peek = forcePeek . peekVersionFuzzy
+
+instance {-# OVERLAPPING #-} Peekable Attr where
+  peek = forcePeek . peekAttr
+
+instance Pushable Sources where
+  push = pushSources