resolve all current build warnings with the supported GHC versions

If I'm lucky.

hledger-lib/Hledger/Read/Common.hs

@@ -108,15 +108,12 @@ import Data.List.NonEmpty (NonEmpty(..))
 import Data.List.Split (wordsBy)
 import Data.Maybe
 import qualified Data.Map as M
-#if !(MIN_VERSION_base(4,11,0))
-import Data.Monoid
-#endif
 import Data.Text (Text)
 import qualified Data.Text as T
 import Data.Time.Calendar
 import Data.Time.LocalTime
 import System.Time (getClockTime)
-import Text.Megaparsec.Compat hiding (skipManyTill)
+import Text.Megaparsec.Compat
 import Control.Applicative.Combinators (skipManyTill)
 
 import Hledger.Data

hledger-lib/Text/Megaparsec/Compat.hs

@@ -18,10 +18,10 @@ where
 
 import qualified Data.Set as S
 import Data.Text
-import Text.Megaparsec
 
 #if MIN_VERSION_megaparsec(6,0,0)
 
+import Text.Megaparsec hiding (skipManyTill)
 import Text.Megaparsec.Char
 import Data.List.NonEmpty (fromList)
 import Data.Void (Void)
@@ -48,6 +48,7 @@ mptext = string
 
 #else
 
+import Text.Megaparsec
 import Text.Megaparsec.Prim (MonadParsec)
 
 -- | A basic parse error type.

hledger-ui/Hledger/UI/AccountsScreen.hs

@@ -33,7 +33,6 @@ import System.FilePath (takeFileName)
 
 import Hledger
 import Hledger.Cli hiding (progname,prognameandversion)
-import Hledger.Cli.Commands.Add (add)
 import Hledger.UI.UIOptions
 import Hledger.UI.UITypes
 import Hledger.UI.UIState

hledger/Hledger/Cli/Commands/Rewrite.hs

@@ -14,10 +14,8 @@ import Data.List (sortOn, foldl')
 import Data.String.Here
 import qualified Data.Text as T
 import Hledger
-import Hledger.Data.AutoTransaction (runModifierTransaction)
 import Hledger.Cli.CliOptions
 import Hledger.Cli.Commands.Print
---import Hledger.Cli hiding (outputflags)
 import System.Console.CmdArgs.Explicit
 import Text.Printf
 import Text.Megaparsec