Looks like your other comment hit the max reply depth so this will need to finish up, but in any case I don't agree with your reading of the vice versa.
It may be that the aliasing rules are also required to fully justify my conclusion (ie. a Base can't have its stored value accessed via a pointer-to-derived due to the aliasing rules). But I have a very high degree of confidence in the conclusion itself. I think that you will find that your compiler implements the behavior I have described.
There isn't actually a depth limit (or if there is we haven't hit it yet :). HackerNews just hides the "reply" link for 5 minutes or so to cool down flamewars.
You can work around this by clicking on the link for the post itself (ie. "3 minutes ago") which allows you to reply immediately.