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-rw-r--r--haddock-api/src/Haddock/InterfaceFile.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/haddock-api/src/Haddock/InterfaceFile.hs b/haddock-api/src/Haddock/InterfaceFile.hs
index 30bd2b9a..8e01a38d 100644
--- a/haddock-api/src/Haddock/InterfaceFile.hs
+++ b/haddock-api/src/Haddock/InterfaceFile.hs
@@ -434,7 +434,7 @@ instance Binary Example where
result <- get bh
return (Example expression result)
-instance Binary Hyperlink where
+instance Binary a => Binary (Hyperlink a) where
put_ bh (Hyperlink url label) = do
put_ bh url
put_ bh label