(a => {}).length
typeof (() => {});
export default (() => {})();
(() => {})()``;
(() => {})``;
new (() => {});
if ((() => {}) ? 1 : 0) {}
let f = () => ({}())
let a = () => ({} instanceof a);
a = () => ({} && a);
a = () => ({}() && a);
a = () => ({} && a && b);
a = () => ({} + a);
a = () => ({}()() && a);
a = () => ({}.b && a);
a = () => ({}[b] && a);
a = () => ({}`` && a);
a = () => ({} = 0);
a = () => ({}, a);
a => a instanceof {};
a => ({}().b && 0)
a => ({}().c = 0)
x => ({}()())
x => ({}()``)
x => ({}().b);
a = b => c;
a = (b?) => c;
x => (y = z);
x => (y += z);
f(a => ({})) + 1;
(a => ({})) || 0;
a = b => c;
a = b => {
  return c
};