babel/packages/babel-plugin-proposal-async-do-expressions/test/fixtures/async-do-expressions/hoist-variables-assigned-in-async-context/exec.js

const x = async do { await Promise.resolve(); var y = 21; y + y }

expect(y).toBe(undefined);
x.then((resolved) => {
  expect(y).toBe(21);
  expect(resolved).toBe(42);
}).catch(err => { throw err });