Destructuring assignments with objects break script

[Destructuring assignments](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment) with objects will insert a stray semicolon that breaks the script.

```javascript
({a} = {b: 1})
```

becomes

```javascript
({a};={b:1})
```

when it should become

```javascript
({a}={b:1})
```