Comment by jbackus

Yeah. Been years since I even played with it, but even in 2016 I remember Ripper being completely unusable, failing to parse plenty of normal Ruby syntax. The Parser gem also maintains a separate parser for every Ruby version, so you can a program using Ruby 2.5 but tell it to parse code according to Ruby 2.2 syntax. It's also just way better built, tested, and has other nice features like tools for rewriting ASTs.