What about: runIOT :: Monad m => IOT m a -> IO (m a) Keean. Udo Stenzel wrote:

Henning Sato von Rosen schrieb am 18.12.04 18:31:11:

...

For each basic monad there seems to be a corresponding transformer, e.g. 'StateT' for 'State' and so on.

To be useful every transformer has a "run" method of some kind. For a hypothetical IO transformer it would look like

runIOT :: Monad m => IOT m a -> m a

...which is basically the same as unsafePerformIO and defeats the purpose of having an IO Monad at all. If you want to retain the IO-type in the result, then you don't need IOT at all, layering any transformer on top of IO is exactly what's needed.

Udo.

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