Replace parts of _G not working.

So, I'm working on a program that turn shell.run() into something else, and _G.lol into shell.run()

The code I have is:

_G.lol = _G.shell.run
_G.shell.run = function()
   print("Testing Testing 1 2 3")
end

So… what's the problem? This should work fine.

It doesn't work for some reason.

Wait, Fixed it.

Also, you can remove every single _G in that program.

A big part of the reason this wouldn't have worked is because the shell "API" isn't a real API, and therefore is not found in _G. It's an interface exposed to programs running under and individual shell instance.