[Haskell-beginners] [m [a]] -> m [a]

[Daniel Fischer]

On Wednesday 17 August 2011, 13:20:55, Guy wrote:
> Is there a function which can do this, where m is not mplus?
> 
> I would like all the lists to be joined inside the monad with ++.

sequence gives you m [[a]], then an fmap concat (or liftM concat, since 
fmap requires an additional Functor constraint) flattens the resulting list 
to m [a].