It's a completely useless question - it's language trivia. It's like asking "what happens if you do X in database Y version Z and up". Who cares? It's something you figure out when you get there. There are tons of examples of something like this where it's language-dependent, so don't even bother memorizing this stuff.

I once passed an interview where it was all just Spring documentation questions. I had never built a Spring app in my life, I just "read the docs" five times.