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diff --git a/src/Text/Pandoc/Lua/SharedInstances.hs b/src/Text/Pandoc/Lua/SharedInstances.hs
deleted file mode 100644
index e9e72c219..000000000
--- a/src/Text/Pandoc/Lua/SharedInstances.hs
+++ /dev/null
@@ -1,44 +0,0 @@
-{-
-Copyright © 2012-2017 John MacFarlane <jgm@berkeley.edu>
-            2017 Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
--}
-{-# LANGUAGE CPP                  #-}
-{-# LANGUAGE FlexibleInstances    #-}
-{-# LANGUAGE LambdaCase           #-}
-#if !MIN_VERSION_base(4,8,0)
-{-# LANGUAGE OverlappingInstances #-}
-#endif
-{-# OPTIONS_GHC -fno-warn-orphans #-}
-{- |
-   Module      : Text.Pandoc.Lua.SharedInstances
-   Copyright   : © 2012–2016 John MacFarlane,
-                 © 2017 Albert Krewinkel
-   License     : GNU GPL, version 2 or above
-
-   Maintainer  : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
-   Stability   : alpha
-
-Shared StackValue instances for pandoc and generic types.
--}
-module Text.Pandoc.Lua.SharedInstances () where
-
-import Foreign.Lua (ToLuaStack (push))
-
-instance (ToLuaStack a, ToLuaStack b) => ToLuaStack (Either a b) where
-  push = \case
-    Left x -> push x
-    Right x -> push x