Proposal: Add Chris Done's "om" combinator to Control.Monad

[Bryan O'Sullivan]

On Thu, Jul 25, 2013 at 9:37 PM, John Wiegley <johnw at fpcomplete.com> wrote:

> It's just that I tend to write the following a LOT:
>
>     x <- someMonadicFunction
>     when x $ do
>

Sure, this is a common pattern. But the name is terrible, and it's not
clear to me that the functionality is a useful generalization. Why not
advocate for whenM instead?

whenM :: Monad m => m Bool -> m () -> m ()
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