Rakefile lacks the following change:

diff --git a/Rakefile b/Rakefile
index 778e61db..1afcf209 100644
--- a/Rakefile
+++ b/Rakefile
@@ -38,6 +38,7 @@ GENERATED_FILES = %w(lib/parser/lexer-F0.rb
                      lib/parser/ruby31.rb
                      lib/parser/ruby32.rb
                      lib/parser/ruby33.rb
+                     lib/parser/ruby34.rb
                      lib/parser/macruby.rb
                      lib/parser/rubymotion.rb)

Ref: #904

@koic good catch. I updated my PR.

Overall, this looks good. One point I forgot to mention is that the commit message title needs + prefix:
https://github.com/whitequark/parser/blob/master/CONTRIBUTING.md#contributing-to-parser

the commit message title needs + prefix:

Ah, thank you. I fixed that as well.

Thanks.

Honestly I was hoping for some hype around Prism to slowly deprecate parser for 3.4+ Rubies. Maintaining all grammars for all Rubies starting from 1.8 is getting more and more painful, any change to the shape of the internal state can require a change to 16 (well, now 17) .y files.

Also, branching 3.4 now means that we'll need to backport all changes starting from Ruby 3.3.1 both to ruby33.y and ruby34.y so previously I was trying to postpone adding a new version of parser as much as I could until somebody comes and explicitly asks to do that. This time it happened faster than ever before.

Do you need a release?

Honestly I was hoping for some hype around Prism to slowly deprecate parser for 3.4+ Rubies.

I highly suspect 3.4 will be the last one, but yeah, right now lots of tooling hasn't moved (and will probably take a while because prism doesn't support older rubies (yet?)

Do you need a release?

It would be nice, but no rush.

3.3.0.4 has been released

Much appreciated.