Destructuring assignment

Given

struct Point { x: int, y: int }
fn returns_point(...) -> Point { ... }
fn returns_tuple(...) -> (int, int) { ... }

it would be nice to be able to do things like

let a; let b;
(a, b) = returns_tuple(...);
let c; let d;
Point { x: c, y: d } = returns_point(...);

and not just in lets, as we currently allow.

Perhaps even:

let my_point: Point;
(my_point.x, my_point.y) = returns_tuple(...);

(Most use cases would likely involve mut variables; but those examples would be longer.)

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