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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.devel
Subject: Re: New package emacs-parser-generator
Date: Wed, 01 Dec 2021 08:45:26 -0500
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> Ok where can I read about this function?

You can try and start with
https://tree-sitter.github.io/tree-sitter/#underlying-research


        Stefan