chore(debug): fix traceStack calls

yesod-core/src/Yesod/Core/Internal/Run.hs

@@ -208,10 +208,7 @@ runHandler rhe@RunHandlerEnv {..} handler yreq = withInternalState $ \resState -
 safeEh :: (Loc -> LogSource -> LogLevel -> LogStr -> IO ())
        -> ErrorResponse
        -> YesodApp
-safeEh log' er req = do
-    traceStack "safeEh debug trace, log':" log'
-    traceStack "safeEh debug trace, er:" er
-    traceStack "safeEh debug trace, req:" req
+safeEh log' er req = traceStack "safeEh debug trace, log':" log' $ traceStack "safeEh debug trace, er:" er $ traceStack "safeEh debug trace, req:" req $ do
     liftIO $ log' $(qLocation >>= liftLoc) "yesod-core" LevelError
            $ toLogStr $ "Error handler errored out: " ++ show er
     return $ YRPlain