Warn on all tools when shadowed

lib/GHCup/Stack.hs

@@ -50,6 +50,7 @@ import           System.FilePath
 import           System.IO.Error
 
 import qualified Data.Text                     as T
+import Text.PrettyPrint.HughesPJClass (prettyShow)
 
 
 
@@ -229,6 +230,10 @@ setStack ver = do
 
   lift $ createLink targetFile stackbin
 
+  liftIO (isShadowed stackbin) >>= \case
+    Nothing -> pure ()
+    Just pa -> lift $ logWarn $ T.pack $ prettyShow (ToolShadowed Cabal pa stackbin ver)
+
   pure ()