Type of Control.Monad.Writer.listens
Tom Pledger
Tom.Pledger@peace.com
Tue, 6 May 2003 08:47:33 +1200
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