Control.Monad proposal: Add whenJust

[Mark Lentczner]

On Thu, May 16, 2013 at 1:51 AM, Henning Thielemann <
lemming at henning-thielemann.de> wrote:

> 3. I switched to 'transformers' completely long ago. It does not re-export
> any monad helper functions.
>

This! I know it's off-topic but: I did the same. MTL has some nice
features... it wasn't worth the hell of it's re-exports.
Re-exporting is the devil's work, I say!

- Mark
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