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--- Agda-2.4.2.5/src/full/Agda/Utils/HashMap.hs~	2015-12-19 06:29:26.000000000 +0900
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+++ Agda-2.4.2.5/src/full/Agda/Utils/HashMap.hs	2016-10-06 14:19:19.071676894 +0900
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@@ -5,7 +5,7 @@
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   ) where
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 import Data.Hashable
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-import Data.HashMap.Strict as HashMap
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+import Data.HashMap.Strict as HashMap hiding (alter, mapMaybe)
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 import qualified Data.Maybe as Maybe
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 -- | Like 'Data.Map.Strict.mapMaybe'.