Use Text.find and isJust instead of Text.elem

Text.elem is too new even for GHC 8.10

Author: akshaymankar

plugins/hls-pragmas-plugin/src/Ide/Plugin/Pragmas.hs

@@ -19,7 +19,7 @@ import           Control.Lens                       hiding (List)
 import           Control.Monad.IO.Class             (MonadIO (liftIO))
 import qualified Data.HashMap.Strict                as H
 import           Data.List.Extra                    (nubOrdOn)
-import           Data.Maybe                         (catMaybes)
+import           Data.Maybe                         (catMaybes, isJust)
 import qualified Data.Text                          as T
 import           Development.IDE
 import           Development.IDE.GHC.Compat
@@ -203,7 +203,7 @@ completion _ide _ complParams = do
                       , Fuzzy.test word matcher
                       , (appearWhere == NewLine && line == word)
                         || (appearWhere == CanInline && line /= word)
-                        || (T.elem ' ' matcher && appearWhere == NewLine && Fuzzy.test line matcher)
+                        || (isJust (T.find (== ' ') matcher) && appearWhere == NewLine && Fuzzy.test line matcher)
                       ]
                     where
                         line = T.toLower $ VFS.fullLine pfix