Record initialization and destructuring syntax

[woolsweater (Josh Caswell)]

@Max_Desiatov

let [x, notZ, newY: y] = s

The fact that Swift uses square brackets for both dictionaries and arrays makes me subconsciously parse that as almost an array at first, so maybe that's not the best idea.

I don't think it's that far off. Its semantics resemble a capture list, where we also use square brackets, but = instead of a colon.