Alternative nameof implementation that doesn't need source code

[alexmojaki]

I recently implemented my own version of nameof just for fun after a discussion on python-ideas. I don't know if you'd want to actually use it in your library, but I thought you'd find it interesting. One cool feature is that it only uses bytecode, not source code, so it even works in the standard Python shell!

[pwwang]

Apart from being working with standard Python shell, is there anything better than the current implementation? More stable, for example?
If so, would you like to do a PR (to make sure all the current tests pass)?