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.
return <a role="link" />;
    }
    const renderer = ReactTestRenderer.create(<Link />);
    expect(renderer.toJSON()).toEqual({
      type: 'a',
      props: {role: 'link'},
      children: null,
    });
  });
  it('renders a top-level empty component', () => {
    function Empty() {