:2:10: error: • Exception when trying to run compile-time code: Prelude.undefined CallStack (from HasCallStack): undefined, called at :2:10 in interactive:Ghci1 Code: undefined • In the Template Haskell splice $$undefined In the first argument of ‘print’, namely ‘($$undefined :: String)’ In the first argument of ‘GHC.GHCi.ghciStepIO :: IO a -> IO a’, namely ‘(print ($$undefined :: String))’