Nested arrow async functions

var a = async () => {
  return await (async () => {
    return await b();
  })();
};

It can’t parse this. It seems the syntax is OK.

[insidewhy]

I get the same unknown expression of type... error even when not using nested async functions, sometimes just having an arrow function in an async function is enough to give that same error from babel. It also doesn’t give you a line number, just the file. Pretty serious bug.

[rjdestigter]

I’m having this issue at the moment using: node: 6.9.3 npm: 4.1.1 webpack: 2 + babel-preset-env + stage-0

presets: [
      ['env', {
        targets: {
          browsers: [
            '>1%',
            'last 2 versions',
            'not ie <= 11',
          ],
        },
        modules: false,
        useBuiltIns: false,
        debug: true,
      }],
      'react',
      'stage-0',
    ],

But only on a windows machine. On a linux machine no problems compiling.

Edit: I had everything installed using npm install however yarn was also available and after running yarn the issue was resolved. I’m assuming an older version of one of the dependencies was still present.