Control.Monad proposal: Add whenJust

Henning Thielemann lemming at
Fri May 17 13:30:32 CEST 2013

On Thu, 16 May 2013, amindfv at wrote:

> I +1 edwardk's suggestion of updating the prelude, but couldn't "classy 
> prelude"-style drop-ins allow the same?

I would prefer using "classy prelude" packages, too.

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