Please forgive me if this appears more like a rant than a feature request, but I have searched and can't find any explanation for why some error messages are displayed without any `displayName` from the component responsible - and this is driving me insane.

_Every_ component in my project has an explicit `displayName` specified.  I do this for debugging.

I am rendering a bunch of immutable props.  I changed one of the prop types from a `List` to a `Map` and I see:

> Warning: Using Maps as children is not yet fully supported. It is an experimental feature that might be removed. Convert it to a sequence / iterable of keyed ReactElements instead.

Obviously I missed something, which could be easily fixed if I knew _where_ it was - even just the component's name.

This message is not only frustrating, but it's taunting "I know where the problem is but I won't tell you!"-feel makes it infuriating.  Looking at the stacktrace behind it is useless as well because it's, as usual, a never-ending list of React function calls with no mention of any of my source files.

I have spent countless time hunting down errors like this that would have taken only moments if I knew the name of the component responsible.  It would be _infinitely more helpful_ if the `displayName` field appeared in more debug output.

'experimental feature that might be removed. Convert it to a sequence ' +
      '/ iterable of keyed ReactElements instead.'
    );
  });
  it('should not enumerate enumerable numbers (#4776)', function() {
    
    Number.prototype['@@iterator'] = function() {
      throw new Error('number iterator called');
    };
    
    try {
      var instance = (
        <div>
          {5}
          {12}
          {13}
        </div>
      );
      var traverseFn = jasmine.createSpy();
      traverseAllChildren(instance.props.children, traverseFn, null);
      expect(traverseFn.calls.count()).toBe(3);
      expect(traverseFn).toHaveBeenCalledWith(
        null,
        5,
        '.0'
      );
      expect(traverseFn).toHaveBeenCalledWith(
        null,
        12,
        '.1'