Destructuring of objects within arrays can generate invalid JavaScript #4787
Description
The combination of object and array destructuring seems not to work correctly when using ... in the array destructuring part. For example
[...,{forename,surname}] = arr
generates
var forename, surname;
{forename, surname} = arr[arr.length - 1];
but should generate
var forename, surname;
({forename, surname} = arr[arr.length - 1]);
In CoffeeScript 1.9.1 the same code compiles to
var forename, ref, surname;
(ref = arr[arr.length - 1], forename = ref.forename, surname = ref.surname);
which is valid JavaScript.