diff --git a/lib/GHCup.hs b/lib/GHCup.hs
index e043bfb..ca02662 100644
--- a/lib/GHCup.hs
+++ b/lib/GHCup.hs
@@ -5,6 +5,7 @@
 {-# LANGUAGE FlexibleInstances     #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE OverloadedStrings     #-}
+{-# LANGUAGE QuasiQuotes           #-}
 {-# LANGUAGE TemplateHaskell       #-}
 
 {-|
@@ -1252,7 +1253,7 @@ setHLS ver shls = do
     -- not for legacy
     SetHLS_XYZ -> liftE $ rmMinorHLSSymlinks ver
     -- legacy and new
-    SetHLSOnly -> liftE $ rmPlainHLS
+    SetHLSOnly -> liftE rmPlainHLS
 
   case shls of
     -- not for legacy
@@ -1267,7 +1268,6 @@ setHLS ver shls = do
                      else fname <> "~" <> T.unpack (prettyVer ver) <> exeExt
         lift $ createLink destL (binDir </> target)
 
-      pure ()
     -- legacy and new
     SetHLSOnly -> do
       -- set haskell-language-server-<ghcver> symlinks
@@ -1287,8 +1287,6 @@ setHLS ver shls = do
 
       lift warnAboutHlsCompatibility
 
-      pure ()
-
 
 unsetHLS :: ( MonadMask m
             , MonadReader env m
@@ -2846,7 +2844,7 @@ rmHLSNoGHC = do
   hlses <- fmap rights getInstalledHLSs
   forM_ hlses $ \hls -> do
     hlsGHCs <- fmap mkTVer <$> hlsGHCVersions' hls
-    let candidates = filter (`notElem` ghcs) $ hlsGHCs
+    let candidates = filter (`notElem` ghcs) hlsGHCs
     if (length hlsGHCs - length candidates) <= 0
     then rmHLSVer hls
     else
diff --git a/lib/GHCup/Utils.hs b/lib/GHCup/Utils.hs
index a51d5c1..a05dbfb 100644
--- a/lib/GHCup/Utils.hs
+++ b/lib/GHCup/Utils.hs
@@ -251,7 +251,7 @@ rmPlainHLS = do
   Dirs {..}  <- lift getDirs
 
   -- delete 'haskell-language-server-8.10.7'
-  hlsBins <- fmap (filter (\f -> not ("haskell-language-server-wrapper" `isPrefixOf` f) && not ('~' `elem` f)))
+  hlsBins <- fmap (filter (\f -> not ("haskell-language-server-wrapper" `isPrefixOf` f) && ('~' `notElem` f)))
     $ liftIO $ handleIO (\_ -> pure []) $ findFiles
       binDir
       (makeRegexOpts compExtended execBlank ([s|^haskell-language-server-.*$|] :: ByteString))
@@ -518,7 +518,7 @@ hlsInstalled ver = do
 isLegacyHLS :: (MonadIO m, MonadReader env m, HasDirs env, MonadCatch m) => Version -> m Bool
 isLegacyHLS ver = do
   bdir <- ghcupHLSDir ver
-  not <$> (liftIO $ doesDirectoryExist bdir)
+  not <$> liftIO (doesDirectoryExist bdir)
 
 
 -- Return the currently set hls version, if any.
@@ -620,8 +620,8 @@ hlsInternalServerScripts :: (MonadReader env m, HasDirs env, MonadIO m, MonadThr
 hlsInternalServerScripts ver mghcVer = do
   dir <- ghcupHLSDir ver
   let bdir = dir </> "bin"
-  (fmap (bdir </>) . filter (\f -> maybe True (\gv -> ("-" <> T.unpack (prettyVer gv)) `isSuffixOf` f) mghcVer))
-    <$> (liftIO $ listDirectory bdir)
+  fmap (bdir </>) . filter (\f -> maybe True (\gv -> ("-" <> T.unpack (prettyVer gv)) `isSuffixOf` f) mghcVer)
+    <$> liftIO (listDirectory bdir)
 
 -- | Get all binaries for a hls version from the ~/.ghcup/hls/<ver>/lib/haskell-language-server-<ver>/bin directory, if any.
 -- Returns the full path.
@@ -633,8 +633,8 @@ hlsInternalServerBinaries ver mghcVer = do
   dir <- ghcupHLSDir ver
   let regex = makeRegexOpts compExtended execBlank ([s|^haskell-language-server-.*$|] :: ByteString)
   (Just bdir) <- fmap headMay $ liftIO $ expandFilePath [Left (dir </> "lib"), Right regex, Left "bin"]
-  (fmap (bdir </>) . filter (\f -> maybe True (\gv -> ("-" <> T.unpack (prettyVer gv)) `isSuffixOf` f) mghcVer))
-    <$> (liftIO $ listDirectory bdir)
+  fmap (bdir </>) . filter (\f -> maybe True (\gv -> ("-" <> T.unpack (prettyVer gv)) `isSuffixOf` f) mghcVer)
+    <$> liftIO (listDirectory bdir)
 
 -- | Get all libraries for a hls version from the ~/.ghcup/hls/<ver>/lib/haskell-language-server-<ver>/lib/<ghc-ver>/
 -- directory, if any.
@@ -647,7 +647,7 @@ hlsInternalServerLibs ver ghcVer = do
   dir <- ghcupHLSDir ver
   let regex = makeRegexOpts compExtended execBlank ([s|^haskell-language-server-.*$|] :: ByteString)
   (Just bdir) <- fmap headMay $ liftIO $ expandFilePath [Left (dir </> "lib"), Right regex, Left ("lib" </> T.unpack (prettyVer ghcVer))]
-  (fmap (bdir </>)) <$> (liftIO $ listDirectory bdir)
+  fmap (bdir </>) <$> liftIO (listDirectory bdir)
 
 
 -- | Get the wrapper binary for an hls version, if any.