[Haskell-cafe] Std lib equivalent for liftM concat . sequence

[Miguel Mitrofanov]

Seems to be close to

sequence :: [ListT m a] -> ListT m a

Hmm?

On 16 May 2008, at 14:12, Alistair Bayley wrote:

> A couple of days ago I had need for:
>
>> concatM :: Monad m => [m [a]] -> m [a]
>> concatM = liftM concat . sequence
>
> but found no such thing in the std libs, except perhaps for msum (I
> don't want to add instances for MonadPlus. Should I have to?). Have I
> missed something trivial?
>
> Alistair
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