remove unneeded imports

src/Convert/Interface.hs

@@ -6,7 +6,6 @@
 
 module Convert.Interface (convert) where
 
-import Data.List (lookup)
 import Data.Maybe (fromJust, mapMaybe)
 import Control.Monad.Writer
 import qualified Data.Map.Strict as Map

src/Language/SystemVerilog/AST/ModuleItem.hs

@@ -17,8 +17,7 @@ module Language.SystemVerilog.AST.ModuleItem
     ) where
 
 import Data.List (intercalate)
-import Data.Maybe (maybe, fromJust, isJust)
-import Data.Either (either)
+import Data.Maybe (fromJust, isJust)
 import Text.Printf (printf)
 
 import Language.SystemVerilog.AST.ShowHelp

src/Language/SystemVerilog/Parser/Preprocess.hs

@@ -16,7 +16,7 @@ module Language.SystemVerilog.Parser.Preprocess
 import Control.Monad.Except
 import Control.Monad.State
 import Data.Char (ord)
-import Data.List (span, dropWhileEnd, splitAt, tails, isPrefixOf, findIndex)
+import Data.List (dropWhileEnd, tails, isPrefixOf, findIndex)
 import Data.Maybe (isJust, fromJust)
 import System.Directory (findFile)
 import System.FilePath (dropFileName)