typechecker-improvements: add forgotten import
@@ -13,7 +13,7 @@ import Elektra.Errors
import Control.Monad (mapM_, forM_, join)
import Control.Logger.Simple
import Data.Bool (bool)
-import Data.List (intercalate, isPrefixOf)
+import Data.List (intercalate, isPrefixOf, nub)
import Data.Maybe (fromMaybe, listToMaybe)
import Foreign.Ptr
import System.IO.Temp (writeTempFile)
