src/third_party/mozjs-45/js/src/jit-test/tests/proxy/testDirectProxySet2.js

/*
 * Call the trap with the handler as the this value, the target as the first
 * argument, the name of the property as the second argument, the value as the
 * third argument, and the receiver as the fourth argument
 */
var target = {};
for (var key of ['foo', Symbol.for('quux')]) {
    var handler = { };
    for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy]) {
        handler.set = function (target1, name, val, receiver) {
            assertEq(this, handler);
            assertEq(target1, target);
            assertEq(name, key);
            assertEq(val, 'baz');
            assertEq(receiver, p);
            called = true;
        }

        var called = false;
        p[key] = 'baz';
        assertEq(called, true);
    }
}