Re: [Haskell-cafe] Fighting the monad stack, MonadIO

On Thu, Apr 10, 2008 at 2:50 PM, Adam Smyczek wrote:

For a small webapi binding I try to implement a session like monad by building a stack including BrowserAction from Network.Browser module as following:

newtype RBAction a = RBAction { exec :: ErrorT String (StateT RBState BrowserAction) a } deriving (Functor, Monad, MonadState RBState)

I would like the RBAction to implement MonadIO as well, but fight with the liftIO function for hours now, without success. Any idea how the implementation of liftIO could look like?

I suspect BrowserAction does not implement MonadIO (lest you could just put MonadIO in the deriving clause). So, that depends on how BrowserAction is implemented. What package is Network.Browser in? Luke