They should be highlighted the same way nonexistant variables are highlighted.
[code]local a = 1
local b = 2
return a[/code]
“b” should have a blue squiggle.
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personally, I love this new feature, and I usually like plain IDEs, I agree with this assessment, lets have more stuff to encourage good coding practices 
I recently had to clean up 2kloc, and it went like a breeze, I was done in 30 minutes due to this new feature, it’s basically like a accidental global initialization finder <3