Type of Control.Monad.Writer.listens

[Tom Pledger]

Hi.

Is this an appropriate place to report library bugs, or should I post
to the various <implementation>-bugs lists instead?

According to
http://www.haskell.org/ghc/docs/latest/html/base/Control.Monad.Writer.html

    listens :: (MonadWriter w m) => (w -> w) -> m a -> m (a, w)

but the inferred type is more general (and more useful)

    listens :: (MonadWriter w m) => (w -> b) -> m a -> m (a, b)

Regards,
Tom