Computed properties in destructuring patterns are not recognized

[weswigham]

We compile this:

let foo = "bar";
let {[foo]: bar} = {bar: "bar"};

to this:

var foo = "bar";
var _a = [foo], bar;
{
    bar: "bar";
}
;

(and error on the syntax)
whereas babel compiles it cleanly to this:

"use strict";

var foo = "bar";
var _bar = { bar: "bar" };
var bar = _bar[foo];

Babel's output functions as expected, ours does not.

There's a section on this on the MDN article on destructuring.

[DanielRosenwasser]

This is indeed an ES6 feature; follow from http://rbuckton.github.io/grammarkdown/es6.html#ObjectBindingPattern