[swift-evolution] Proposal Draft: Optional Upgrading Assignment.

[Paul Ossenbruggen]

Ok if it conflicts then that is a good reason to not do this. 

Sent from my iPhone

> On Feb 4, 2016, at 9:35 AM, Chris Lattner <clattner at apple.com> wrote:
> 
> 
> ## Proposal
> 
> I
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