We purge it [here](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L88-L89) but this code doesn’t run because of the [early exit](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L53-L57).

Need to fix this and add a test case to make sure we don’t regress on it.

return element;
    }
    var container = document.createElement('div');
    ReactDOM.render(<Foo />, container);
    expectNoWaste(() => {
      element = <div />;
      ReactDOM.render(<Foo />, container);
    });
  });
  it('should not count replacing a native with null as waste', function() {
    var element = <div />;
    function Foo() {
      return element;
    }
    var container = document.createElement('div');
    ReactDOM.render(<Foo />, container);
    expectNoWaste(() => {