Log Message:
devel/ruby-parser: update to 3.21.0

3.21.0 (2024-01-15)

18 minor enhancements:

* (internal) Added simple RubyLexer#comment.
* (internal) Removed RubyLexer#comments and #ignore_body_comments.
* (internal) Removed RubyParser#comments.
* (internal) Renamed files from lib/ruby##_parser.* to lib/ruby_parser##.*
* (internal) Renamed lib/ruby3_parser.yy to lib/ruby_parser3.yy
* (internal) Renamed lib/ruby_parser.yy to lib/ruby_parser2.yy
* Added tentative 3.2 support. (torrocus)
* Made `rake compare` a multitask (28s -> 10s!!).
* Made `rake compare` depend on `generate` (from clean: 28s -> 18s).
* No longer package versioned .y files.
* Overhaul of parser/lexer comment processing.
* Parser productions for k_class/k_module/k_def carry their comment with
  them.
* Restructured build tasks to utilize Hoe's .yy support! 8.5s -> 1.2s!!!
* RubyParser new_(class|module|defn|defs) handle comment processing via
  sexp.
* RubyParser new_(class|module|defn|defs) handle normalizing production
  sexps.
* RubyParser#next_token clears out lexer's comment when applicable.
* Simplified parser productions for defn_head, defs_head. No more
  normalizing.
* Updated `rake compare` steps for lrama in ruby 3.3+.

6 bug fixes:

* Cleaned out cruft from `rake compare` code.
* Fixed compare/normalize.rb for lrama differences.
* Made `parser` task depend on `isolate` task to pick up racc generator.
* Made racc a runtime dependency (was dev only) now that ruby 3.3 doesn't
  ship with the racc runtime. (wildmaples)
* Updated README.rdoc updating instructions to match current filenames.
* Updated compare versions and added 3.3.