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