here is an app https://gist.github.com/gre/52e28f74eda0beccc17e880efe18c250
There is intentionally a bug in this app: the App component returns `<Demo setVariables={v=>this.setState(..)} variables={..} />` and `Demo` calls `setVariables` in componentDidMount and componentWillReceiveProps (it shouldn't, this is bad user code). What this issue raises is a regression behaviour in React 16 compared to 15.


in React 15 : it renders but you directly get a `Uncaught RangeError: Maximum call stack size exceeded`.
in React 16 : nothing renders, the app never loads and the browser is spinning forever! I think React is stuck in an infinite recursion.

I presume this is because fiber is by nature async. The fact things never ends makes it very hard to investigate and isolate the source of the problem in a large codebase.
should there be some sort of maximum call stack in Fiber ?

> Context: When we migrated our app to latest React Native recently, we had a weird freezing case: the app was completely unresponsive (no button works) but you could still do native actions like scroll a ScrollView. however, even the RN devtool menu action was not working (like the inspector) – probably because it involves JS and React was just stuck in this recursion loop.
In our case, the issue was because calling `relay.setVariables` in lifecycle but with a wrong logic. for some reason our code used to work in the past but now creates this recursion loop.
state = {tabKey: 'hello'};
      render() {
        var child = this.props.children;
        return (
          <Box ref="box">
            <div
              ref="switcherDiv"
              style={{
                display: this.state.tabKey === child.key ? '' : 'none',
              }}>
              {child}
            </div>
          </Box>
        );
      }
    }
    Object.assign(Switcher.prototype, UpdateLoggingMixin);
    class App extends React.Component {
      render() {
        return (
          <Switcher ref="switcher">
            <Child key="hello" ref="child" />
          </Switcher>
        );
      }
    }
    Object.assign(App.prototype, UpdateLoggingMixin);
    var root = <App />;
    root = ReactTestUtils.renderIntoDocument(root);
    function expectUpdates(desiredWillUpdates, desiredDidUpdates) {