[Haskell-cafe] another instance of MonadError

[Corentin Dupont]

Hello,
IO is an instance of MonadError IOException...
However I also need to make it an instance of MonadError String...
Is it possible?
I'm trying to instanciate this class:

class (Typeable n, Monad n, Applicative n, MonadError String n) => EvMgt n
where ...

instance EvMgt IO where...

Any idea?
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