Register a Ruby 3.4 parser

To avoid failing when running as part of ruby-head test builds.

I did the same as previous years, just initialized 3.4 as a copy
of 3.3.

.gitignore

@@ -36,5 +36,6 @@ lib/parser/ruby30.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

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)
 

lib/parser/all.rb

@@ -14,3 +14,4 @@
 require 'parser/ruby31'
 require 'parser/ruby32'
 require 'parser/ruby33'
+require 'parser/ruby34'

lib/parser/current.rb

@@ -119,6 +119,15 @@ def warn_syntax_deviation(feature, version)
     require 'parser/ruby33'
     CurrentRuby = Ruby33
 
+  when /^3\.4\./
+    current_version = '3.4.0'
+    if RUBY_VERSION != current_version
+      warn_syntax_deviation 'parser/ruby34', current_version
+    end
+
+    require 'parser/ruby34'
+    CurrentRuby = Ruby34
+
   else # :nocov:
     # Keep this in sync with released Ruby.
     warn_syntax_deviation 'parser/ruby33', '3.3.x'