Hi,
When I look in the Haddock generated code at: http://www.haskell.org/ghc/docs/latest/html/libraries/base/ Control.Monad.html#t%3AMonadPlus, I don't seem to find any reference to the IO monad being an instance of the MonadPlus class.
But when I look at the source code in libraries/mtl/Control/Monad/Error.hs it clearly is. Why is this happening?
Cheers,
Sean
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