Just about every time I set up a new `Context.Provider`, I end up accidentally specifying a `values` prop rather than `value`.  While it's a minor error, generally I build the container in which the provider resides and commit it to the code base before I ever use it.  It's only later when I go to use it that I realize I did it again.  Since the `Context.Provider` seems pretty much useless without a `value` prop specified, I'd love it if there was a prop error if it is missing... especially if another prop is defined on the `Context.Provider` instead.
expect(ReactNoop.getChildren()).toEqual([
          span('static 1'),
          span('static 2'),
        ]);
        
        inst.setState({step: 1});
        expect(Scheduler).toFlushAndYield(['App', 'Consumer']);
        expect(ReactNoop.getChildren()).toEqual([
          span('static 1'),
          span('static 2'),
          span(1),
        ]);
        
        inst.setState({step: 2});
        expect(Scheduler).toFlushAndYield(['App', 'Consumer']);
        expect(ReactNoop.getChildren()).toEqual([
          span('static 1'),
          span('static 2'),
          span(2),
        ]);
      });
    });
  }
  describe('Context.Provider', () => {
    it('warns if calculateChangedBits returns larger than a 31-bit integer', () => {
      const Context = React.createContext(
        0,
        (a, b) => Math.pow(2, 32) - 1, 
      );
      function App(props) {