<script src="../include.js"></script>
<script id="__NEXT_DATA__"></script>
<script>
    test(() => {
        "use strict";
        println(`window.__NEXT_DATA__ = ${window.__NEXT_DATA__}`);
        window.__NEXT_DATA__ = undefined;
        println(`window.__NEXT_DATA__ = ${window.__NEXT_DATA__}`);

        println(`window[0] = ${window[0]}`);

        // FIXME: Other browsers just swallow this error, but we throw an exception.
        try {
            window[0] = 42;
        } catch (e) {
            println(`e = ${e}`);
        }
        println(`window[0] = ${window[0]}`);
        window.__proto__[0] = 42;
        println(`window[0] = ${window[0]}`);
    });
</script>