I discovered some weird syntaxes while programming ES8 parser.

ES8_weird_syntaxes.js

let yield = 3.14;
//  ^^^^^
// Hey! yield is not reserved keyword?

let await = yield;
//  ^^^^^   ^^^^^
// Okay, even await isn't reserved keyword too?

// Let's do something crazy...
let {} = {}; // WTF ???
let [] = []; // How is that valid syntax?

{
let async_fn = async () => {};
async function await () {
            // ^^^^^ Async function's name can be await. WTF??? 😲
    return await async_fn();
}

function * yield () {
        // ^^^^^ Generator function's name can be yield. Really???
    yield yield yield yield yield; // You are kidding me! 😁
}
}

// Let's do even more crazier...
let o = {
    while () {}, if () {}, function () {}, let () {}, const () {},
    3.14 () {},
    null () {},
    undefined () {}, // Ok, I gave up!!!
}