// @lib: es5,es2015.core,es2015.symbol,es2015.proxy,es2015.generator,es2015.iterable,es2015.reflect
// @target: es6
var s = Symbol();
var t = {};
var p = new Proxy(t, {});
Reflect.ownKeys({});
function* idGen() {
let i = 10;
while (i < 20) {
yield i + 2;
}