代码如下：

const p = Promise.resolve();
(() => {
    const implicit_promise = new Promise(resolve => {
        const promise = new Promise(res => res(p));
        promise.then(() => {
            console.log('after:await');
            resolve();
        });
    });
    return implicit_promise;

})();

p.then(() => {
    console.log('tick:a');
}).then(() => {
    console.log('tick:b');
}).then(() => {
    console.log('tick:c');
})

  这段代码在node 11和浏览器中的输出顺序为：

    tick:a
    tick:b
    after:await
    tick:c

不应该先输出after:await么？