**Do you want to request a *feature* or report a *bug*?**
BUG

**What is the current behavior?**
App doesn't render in IE11 and below.

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template: https://jsfiddle.net/reactjs/69z2wepo/).**
- Build React app with Webpack
- Launch IE11 or below (not an emulator)
- You will see a blank screen or half-compiled React app with the following error:
![24f8f6e8-afde-11e6-9a6f-a3cc6355f55c](https://cloud.githubusercontent.com/assets/1647596/20527736/7b9075a8-b097-11e6-8ccb-d205b1908f31.png)

**What is the expected behavior?**
- To render as it does in Chrome, Firefox, etc.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
We've temporarily shrink-wrapped our dependencies so that we can continue to serve our app. We're starting to believe that it's coming from a dependency that `react`, `apollo`  or `webpack` may be relying on...

Shrink-wrapped versions of our dependencies (left is the new one that's broken and the right one is the old one that continues to work across all browsers) https://www.diffchecker.com/SyaJUcsk
},
    };
    if (shouldConstruct(Component)) {
      inst = new Component(element.props, publicContext, updater);
    } else {
      inst = Component(element.props, publicContext, updater);
      if (inst == null || inst.render == null) {
        child = inst;
        validateRenderResult(child, Component);
        continue;
      }
    }
    inst.props = element.props;
    inst.context = publicContext;
    inst.updater = updater;
    var initialState = inst.state;
    if (initialState === undefined) {
      inst.state = initialState = null;
    }
    if (inst.componentWillMount) {
      inst.componentWillMount();
      if (queue.length) {
        var oldQueue = queue;
        var oldReplace = replace;
        queue = null;
        replace = false;
        if (oldReplace && oldQueue.length === 1) {
          inst.state = oldQueue[0];
        } else {
          var nextState = oldReplace ? oldQueue[0] : inst.state;