Sourced from ruby_parser's changelog.

=== 3.22.0 / 2025-12-20

• 1 major enhancement:

  • Announced the EOL of ruby_parser! YAY!

• 6 minor enhancements:

  • 3.3: working down the grammar structural differences.
  • Added tentative 3.4 support.
  • Renamed assignable to old_assignable and added newer cleaner assignable
  • Restructured comparison rake tasks and normalization to deal with lrama changes.
  • Updated compare versions and added 3.4.
  • Updated grammars to fit most closely to ruby 3.2. Working it down the line.

• 11 bug fixes:

  • Always raise RubyParser::SyntaxError (wrap and raise).
  • Bumped ruby version to 3.2+.
  • Cleaned up user_variable productions to always return sexps.
  • Corrections and enhancements for gauntlet.md instructions.
  • Fixed rake compare's clean subtask to nuke the unpacked ruby dirs entirely.
  • Fixed superclass of V34.
  • Fixed up a couple errors created by using STRICT_SEXP=2. 3 will be neigh impossible.
  • I am nothing if not stubborn: fixed errors caused by STRICT_SEXP=3.
  • Minor fixes for 3.2+ grammars on "defined?" expressions.
  • Removed a lot of ancient compatibility checks and patches. (eg encodings)
  • This in turn cleaned up var_ref and a bunch of other productions.

=== 3.21.1 / 2024-07-09

• 1 bug fix:

  • Fix errors created when string literals are frozen.

=== 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.

... (truncated)

• 5cf23be prepped for release
• d6caa4e ! Announced the EOL of ruby_parser! YAY!
• 6238c30 - Minor fixes for 3.2+ grammars on "defined?" expressions.
• 53045ca - Corrections and enhancements for gauntlet.md instructions.
• 91130fa - Bumped ruby version to 3.2+.
• cda1fbd 3.3: Added newer productions: after_rescue, lex_ctxt, max_numparam, numparam
• d6f641c + Renamed assignable to old_assignable and added newer cleaner assignable
• cae0881 3.3/3.4: minor grammar structure fixes
• 05ca000 fixed unshipped bug: add guard as some syms are sexps
• ffe5206 Updated ruby versions to compare against.
• Additional commits viewable in compare view

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