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-rw-r--r--src/Haddock/InterfaceFile.hs5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/Haddock/InterfaceFile.hs b/src/Haddock/InterfaceFile.hs
index 78ab892b..1f6b489d 100644
--- a/src/Haddock/InterfaceFile.hs
+++ b/src/Haddock/InterfaceFile.hs
@@ -79,6 +79,9 @@ binaryInterfaceVersion = 22
#error Unknown GHC version
#endif
+binaryInterfaceVersionCompatibility :: [Word16]
+binaryInterfaceVersionCompatibility = [21, 22]
+
initBinMemSize :: Int
initBinMemSize = 1024*1024
@@ -187,7 +190,7 @@ readInterfaceFile (get_name_cache, set_name_cache) filename = do
case () of
_ | magic /= binaryInterfaceMagic -> return . Left $
"Magic number mismatch: couldn't load interface file: " ++ filename
- | version /= binaryInterfaceVersion -> return . Left $
+ | version `notElem` binaryInterfaceVersionCompatibility -> return . Left $
"Interface file is of wrong version: " ++ filename
| otherwise -> with_name_cache $ \update_nc -> do