**Do you want to request a _feature_ or report a _bug_?**
Enhancement

**What is the current behavior?**
Element type checker is not as informative as the other ones.

**What is the expected behavior?**
It would be nice to provide the actual type of the prop passed similarly to other type checkers. I.e., instead of 

> Invalid prop `Prop` supplied to `Component`, expected a single ReactElement.

say

> Invalid prop `Prop` of type `type` supplied to `Component`, expected a single ReactElement.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
Seeing this on 15.2.1 but I think it's also applicable to previous versions.

I know the general intention is to move away from prop types, but if there isn't a specific reason for the current behavior I can look into making this more pretty.

var instance = <Component label={<div />} />;
      instance = ReactTestUtils.renderIntoDocument(instance);
      expect(console.error.calls.count()).toBe(0);
    });
    it('should warn when passing no label and isRequired is set', () => {
      spyOn(console, 'error');
      var instance = <Component />;
      instance = ReactTestUtils.renderIntoDocument(instance);
      expect(console.error.calls.count()).toBe(1);
    });
    it('should be implicitly optional and not warn without values', function() {
      typeCheckPass(PropTypes.element, null);
      typeCheckPass(PropTypes.element, undefined);
    });
    it('should warn for missing required values', function() {
      typeCheckFail(PropTypes.element.isRequired, null, requiredMessage);
      typeCheckFail(PropTypes.element.isRequired, undefined, requiredMessage);
    });
    it('should warn if called manually in development', function() {
      spyOn(console, 'error');
      expectWarningInDevelopment(PropTypes.element, [<div />, <div />]);
      expectWarningInDevelopment(PropTypes.element, <div />);
      expectWarningInDevelopment(PropTypes.element, 123);
      expectWarningInDevelopment(PropTypes.element, 'foo');
      expectWarningInDevelopment(PropTypes.element, false);
      expectWarningInDevelopment(PropTypes.element.isRequired, null);
      expectWarningInDevelopment(PropTypes.element.isRequired, undefined);
    });
  });
  describe('Instance Types', function() {