Control.Monad proposal: Add whenJust

[Petr Pudlák]

2013/5/10 Evan Laforge <qdunkan at gmail.com>

> I know about forM_, but I don't use it because it sounds too much like a
> loop.
>

I'd say `forM_` is more like "for each" for a collection (rather than
C-style "for" loop), which makes perfect sense for Maybe. So I prefer
`forM_` instead of adding a new function.

Petr
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