function hasAsyncIteratorSymbolSupport() { // eslint-disable-line id-length
	return (
		typeof Symbol === 'function' &&
		typeof Symbol( 'foo' ) === 'symbol' &&
		hasOwnProp( Symbol, 'asyncIterator' ) &&
		typeof Symbol.asyncIterator === 'symbol'
	);
}
Tests for native `Symbol.asyncIterator` support.

@returns {boolean} boolean indicating if an environment has `Symbol.asyncIterator` support

@example
var bool = hasAsyncIteratorSymbolSupport();
// returns <boolean>