[swift-evolution] [Review] SE-0161: Smart KeyPaths: Better Key-Value Coding for Swift

[Joe Groff]

> On Apr 3, 2017, at 7:24 AM, Ricardo Parada via swift-evolution <swift-evolution at swift.org> wrote:
> 
> By the way, does anybody know why the proposed syntax require a leading period for the key path?
> 
> #keyPath(Family, .pets.first)

Grammatically, it's a series of postfix expression components, including property accesses `.foo`, subscripts `[bar]`, and optional operators `?` and `!`. The grammar is more uniform requiring the dot.

-Joe

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