#! Aaaaaaaaaaa this is JS!!!
// https://github.com/tc39/proposal-hashbang
// This file is mixing all new syntaxes in the proposal in one file without considering syntax conflict or correct runtime semantics
// Enjoy!!! 
// Created at Nov 23, 2018

for await(const x of (new A // https://github.com/tc39/proposal-pipeline-operator
|> do { // https://github.com/tc39/proposal-do-expressions
    case(?) { // https://github.com/tc39/proposal-pattern-matching
        when {val}: class {
            #[?]: ?; // https://github.com/tc39/proposal-private-fields
            fn(...n) {
                // https://github.com/tc39/proposal-nullish-coalescing
                // https://github.com/tc39/proposal-slice-notation
                return this.#[?] ??= n[2:3]
            }
        }
        when _: ?
    }
}
|> ::?.fn // https://github.com/tc39/proposal-bind-operator
|> ?.map do(x) { x -> x + 1}
// https://github.com/tc39/proposal-record-tuple
// https://github.com/tc39/proposal-numeric-separator
// https://github.com/tc39/proposal-extended-numeric-literals
|> (? ?? ? ?? {# a: 1_2_3 #} ?? {| b:2_px |})
|> (async _ =>* { return ? })()) { // https://github.com/tc39/proposal-generator-arrow-functions
}