IHaskell.Eval.Evaluate: only catch exceptions for GHC >=9.0

src/IHaskell/Eval/Evaluate.hs

@@ -516,12 +516,19 @@ evaluate kernelState code output widgetHandler = do
 -- from inside the notebook environment.
 extractValue :: Typeable a => String -> Interpreter (Either String a)
 extractValue expr = do
+#if MIN_VERSION_ghc(9,0,0)
   compiled <- gcatch (Right <$> dynCompileExpr expr) (\exc -> return (Left (show exc)))
   case compiled of
     Left exc -> return (Left exc)
     Right dyn -> case fromDynamic dyn of
       Nothing     -> return (Left multipleIHaskells)
       Just result -> return (Right result)
+#else
+  compiled <- dynCompileExpr expr
+  case fromDynamic compiled of
+    Nothing     -> return (Left multipleIHaskells)
+    Just result -> return (Right result)
+#endif
 
   where
     multipleIHaskells =