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From:
Robert Mosolgo
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How Ripper parses variables
https://rmosolgo.github.io/ruby/ripper/2018/05/21/how-ripper-parses-variables.html
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Ruby has a few different kinds of variables, and Ripper expresses them with a few different nodes. Here are the different variables in Ruby: a# Local variable (or method call on self)$a
