Yes, thanks for pointing out that "valid" should not be thrown out too easily. And it happens that I made and mistake and the snippet is actually valid, a patte

Yes, thanks for pointing out that "valid" should not be thrown out too easily. And it happens that I made and mistake and the snippet is actually valid, a pattern shared with a small set of others exceptions, exactly as you point out ! Thanks for pointing out key aspects of the story, I had a loose knowledge about it.