Writing a compiler: Global variables

I'm writing a programming language that resembles Ruby, called Natalie.

https://github.com/seven1m/natalie

In this video, we add global variables. In Ruby and Natalie, globals start with a dollar sign ($) and are visible everywhere. Things like $LOAD_PATH and regexp match groups ($1, $2, etc.) use globals. ... https://www.youtube.com/watch?v=uPorkbdwsZA