Existential operator (was: ||= is much needed?)

[Aymeric Vitte]

> Because it's rare to have a maybe-method called on a maybe-object,
Yes it's probably rare as I previously mentioned too, thinking about it 
I still can not find a single example of use, then maybe CS users can 
highlight this

Existence looks more important than callable, the CS's way like 
a?.b.c.d.e is interesting

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