Control.Monad proposal: Add whenJust

[kudah]

Importing "properly" is no small problem. Look at nikki&robots
source code for example, some modules there have 200 imports. Even if
you use an Import module to shorten your import list, some things still
want to be imported qualified. Then you're left with the choice of
either using something like classy-prelude, or pulling in a preprocessor
to manage your imports.

On Sun, 12 May 2013 02:58:29 +0200 (CEST) Henning Thielemann
<lemming at henning-thielemann.de> wrote:

> 
> On Sat, 11 May 2013, Simon Hengel wrote:
> 
> > On Sat, May 11, 2013 at 06:15:53PM +0100, Ben Millwood wrote:
> >>
> >> Maybe what we really need to do is work out why Data.Foldable is so
> >> maligned, and sort out the import conflicts so it's easier to use.
> >
> > Yes, sorting out the import conflicts would be awesome.
> 
> There are no import conflicts if you import properly ...
> 
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