Failing `Turtle` `Shell` without throwing an error

Question

I have a program that is supossed to parse the output lines of a program, and produce some output data structure that contains some information extracted from those lines. For doing this I'm using turtle:

import Turtle
import qualified Control.Foldl as F
import           Control.Monad.Except

-- Just for illustration purposes
newtype Result a = Result [a]
type Error = String

collectOutput :: (MonadIO m, MonadError Error m) => Text -> m Result
collectOutput cmd = Result <$> fold (runCmd cmd) F.list
-- Yes, I know turtle does also streaming, but I need to return all the results at the same time. Sorry...

runCmd ::Text -> Shell Result
runCmd cmd = do
    line <- inproc cmd [] empty
    tryParseOutput

Now the problem comes when trying to define tryParseOutput. I would like to abort the command (spawned with inproc cmd [] empty) as soon as an error occurs. For doing this, the the only way I see is by using the die function, which will throw an IOError:

tryParseOutput line =
    case parseOutput line of
        Left parseErr -> die $ show parseErr
        Right res     -> return res 

But now this means that I need to modify collectOutput to handle IOExceptions:

collectOutput :: (MonadIO m, MonadError Error m) => Text -> m Result
collectOutput cmd = do
    mRes <- liftIO $ collectOutputIO cmd
    case mRes of
        Left err -> throwError err
        Right res -> return res

collectOutputIO :: Text -> IO (Either Error Result)
collectOutputIO cmd = 
    (Right . Result <$> fold (runCmd cmd) F.list) `catch` handler
    where 
        handler :: IOException -> Either Error Result
        handler ex = show ex

While this works, I don't like the fact that I'm throwing an IO exception for a parsing error, and there is some exception catching and case analysis involved. So I was wondering whether this could be solved in a more elegant manner (maybe more turtle idiomatic), or I should forget about using MonadError and accept IOError as a fact of life of turtle shell scripts?