[dwattttt]

> Why would a stack frame want to move ownership to its callee, when by the nature of LIFO the callee stack will always be destroyed first, so there is no danger in hanging to it until callee returns.

It definitely takes some getting used to, but there's absolutely times when you could want something to move ownership into a called function, and extending it would be wrong.

An example would be if it represents something you can only do once, e.g. deleting a file. Once you've done it, you don't want to be able to do it again.