Issue #20238 has been updated by kddnewton (Kevin Newton). Sorry the previous link was incorrect. The correct PR is here: https://github.com/ruby/ruby/pull/10005. The comments aren't in the C file, they're in the Ruby file. The C file is relatively minimal as it is — it parses the file and if it's valid it serializes to JSON and dumps to stdout, otherwise it builds the error message, prints to stderr, and exits. The Ruby file performs the tree walk in pretty much the same way that the Ripper one did. ---------------------------------------- Misc #20238: Use prism for mk_builtin_loader.rb https://bugs.ruby-lang.org/issues/20238#change-106852 * Author: kddnewton (Kevin Newton) * Status: Open * Priority: Normal ---------------------------------------- I would like to propose that we use prism for mk_builtin_loader.rb. Right now the Ruby syntax that you can use in builtin classes is restricted to the base Ruby version (2.7). This means you can't use a lot of the nicer syntax that Ruby has shipped in the last couple of years. If we switch to using prism to parse the builtin files instead of using ripper, then we can always use the latest version of Ruby syntax. A pull request for this is here: https://github.com/kddnewton/ruby/pull/65. The approach for the PR is taken from how RJIT bindgen works. -- https://bugs.ruby-lang.org/