Issue #20238 has been updated by kddnewton (Kevin Newton).
Using prism gem it can be newer than the source code (prism gem for ruby 3.5 syntax to build ruby 3.4, for example)
You can pass `Prism.parse(code, version: "3.3.0")` and it will parse as if it were 3.3.0. I'm fine supporting older Ruby versions for this purpose.
Another idea is making small C tool using prism.
I like this idea if we can't use the vendored prism. ---------------------------------------- Misc #20238: Use prism for mk_builtin_loader.rb https://bugs.ruby-lang.org/issues/20238#change-106729 * 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/