**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
} else if (element.type === REACT_FRAGMENT_TYPE) {
      return 'React.Fragment';
    } else {
      return element.type.displayName || element.type.name || 'Unknown';
    }
  };
  var getStackAddendum = function(): string {
    var stack = '';
    if (currentlyValidatingElement) {
      var name = getDisplayName(currentlyValidatingElement);
      var owner = currentlyValidatingElement._owner;
      stack += describeComponentFrame(
        name,
        currentlyValidatingElement._source,
        owner && getComponentName(owner),
      );
    }
    stack += ReactDebugCurrentFrame.getStackAddendum() || '';
    return stack;
  };
  var REACT_FRAGMENT_TYPE =
    (typeof Symbol === 'function' &&
      Symbol.for &&
      Symbol.for('react.fragment')) ||
    0xeacb;
  var VALID_FRAGMENT_PROPS = new Map([['children', true], ['key', true]]);
}
var ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator;
var FAUX_ITERATOR_SYMBOL = '@@iterator'; 
function getDeclarationErrorAddendum() {