UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Steps to reproduce the problem:
1. Open the console
2. Run the following code:
```
var foo = function(bar) {
    return {
        baz: function() {
            [1, 2, 3, 4, 5].forEach(function() {
                debugger;
            });
        }
    }
};
var x = foo('hello');
x.baz();
```
3. When the debugger hits, attempt to get the value of bar.

What is the expected behavior?
The console should yield `hello`.

What went wrong?
Uncaught ReferenceError: bar is not defined
    at eval (eval at <anonymous> (:5:17), <anonymous>:1:1)
    at <anonymous>:5:17
    at Array.forEach (<anonymous>)
    at Object.baz (<anonymous>:4:29)
    at <anonymous>:11:3

Did this work before? N/A 

Chrome version: 59.0.3071.115  Channel: stable
OS Version: OS X 10.12.5
Flash Version: 

If you reference bar anywhere inside of that function before the debugger, all works as expected.