Bug 160992 – Wrong error message for a program that calls a function with arguments that do a getByVal off of undefined

• Component: JavaScriptCore
• Status: RESOLVED DUPLICATE

[Saam Barati]

We print the wrong error message in this program:
```
function foo() {
    let additions = [
        [10, 20],
        //[{}, Symbol()]
        [{}, {}]
    ];
    let addedAdditions = [];
    let allItems = [];

    let map = new Map;
    map.set('foo', 'bar');
    map.set(20, {});
    //let item;
    for (let item of map) {
        if (item[0] === 20) {
            map.delete(20);
            map.set(30, 40);
        }
        print(JSON.stringify(item));
        let addition = additions.pop();
        addedAdditions.push(addition);
        allItems.push(item);
        print(addition);

        map.set(addition[0], addition[1]);

    }

}
foo();
```
We print:
Exception: TypeError: undefined is not an object (evaluating 'map.set')

even though it's "addition[0]" where the undefined load is happening.

[Joseph Pecoraro]

This is fixed by bug 163426!

*** This bug has been marked as a duplicate of bug 163426 ***