src/third_party/mozjs-45/js/src/tests/ecma_6/Proxy/global-receiver.js

// The global object can be the receiver passed to the get and set traps of a Proxy.
var global = this;
var proto = Object.getPrototypeOf(global);
var gets = 0, sets = 0;

try {
    Object.setPrototypeOf(global, new Proxy(proto, {
        has(t, id) {
            return id === "bareword" || Reflect.has(t, id);
        },
        get(t, id, r) {
            gets++;
            assertEq(r, global);
            return Reflect.get(t, id, r);
        },
        set(t, id, v, r) {
            sets++;
            assertEq(r, global);
            return Reflect.set(t, id, v, r);
        }
    }));
} catch (e) {
    global.bareword = undefined;
    gets = 1;
    sets = 1;
}

assertEq(bareword, undefined);
assertEq(gets, 1);

bareword = 12;
assertEq(sets, 1);
assertEq(global.bareword, 12);

reportCompare(0, 0);