[pianoben]

The article mentions that they are building a compatibility layer around YARP that tools can use to transform its new tree format into the legacy Ripper format. They don't call out Rubocop specifically but I can't think of another OSS tool that so prominently uses the parser APIs.

[kddeisz]

rubocop uses rubocop-ast uses parser, so it will eventually make its way down to rubocop once we finish the compat layer for the parser gem.