UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

Steps to reproduce the problem:
Have code like this:

```
    const foo = {
        func: () => {
            console.log('in func');
            return [1, 2];
        }
    }

    console.log('before');
    let [a, b] = foo.func();
    console.log('after');
```

- Set a breakpoint on the `let [a, b]` line.
- Trigger the code, pause on the breakpoint
- Step in

What is the expected behavior?
It should pause before foo.func() has been invoked, and 'step in' should step into that function

What went wrong?
- When the breakpoint is hit, 'in func' has already been logged, indicating that the BP stopped after foo.func() ran, but before the destructuring assignment
- 'step in' - the instruction pointer goes to the next line

Did this work before? N/A 

Chrome version: 61.0.3163.100  Channel: n/a
OS Version: OS X 10.12.6
Flash Version: 

A dotted expression like foo.func is also necessary for this. Strangely, it doesn't repro if I just call a function like func().