ES6 Out: Captures of Super Fail in MS Edge - breaks async/await transpilation

[ChadKillingsworth]

The following code will infinitely loop and alert "Child foo" in MS Edge. All other browsers seem to handle this correctly.

class Base {
  foo() {
    alert('base foo');
  }
}

class Child extends Base {
  foo() {
    const parent = () => super.foo;
    alert('Child foo');
    parent().call(this);
  }
}

(new Child()).foo();

This breaks async / await transpilation with ES2015 out.

[brad4d]

added a comment on PR #3103
a more robust solution is needed

Note that compiling to ES5 is a workaround for this problem.

[ChadKillingsworth]

Chakra bug: chakra-core/ChakraCore#5784