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-rw-r--r--src/Haddock/InterfaceFile.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Haddock/InterfaceFile.hs b/src/Haddock/InterfaceFile.hs
index 924829d7..7e4f6c10 100644
--- a/src/Haddock/InterfaceFile.hs
+++ b/src/Haddock/InterfaceFile.hs
@@ -456,7 +456,7 @@ instance Binary a => Binary (Header a) where
return (Header l t)
{-* Generated by DrIFT : Look, but Don't Touch. *-}
-instance (Binary id) => Binary (Doc id) where
+instance (Binary mod, Binary id) => Binary (DocH mod id) where
put_ bh DocEmpty = do
putByte bh 0
put_ bh (DocAppend aa ab) = do