devel/ruby-parser: update to 3.18.0

3.18.0 (2021-10-27)

Holy crap… 58 commits! 2.7 and 3.0 are feature complete.  Strings &
heredocs have been rewritten.

o 9 major enhancements:

  * !!! Rewrote lexer (and friends) for strings, heredocs, and %*[]
    constructs.
  * Massive overhaul on line numbers.
  * Freeze input! Finally!!! No more modifying the input string for heredocs.
  * Overhauled RPStringScanner. Removed OLD compatibility methods!
  * Removed Sexp methods: value, to_sym, add, add_all, node_type, values.
      - value moved to sexp_processor.
  * Removed String#grep monkey-patch.
  * Removed String#lineno monkey-patch.
  * Removed string_to_pos, charpos, etc hacks for ancient ruby versions.
  * Removed unread_many… NO! NO EDITING THE INPUT STRING!

o 31 minor enhancements:

  * 2.7/3.0: many more pattern edge cases
  * 2.7: Added `mlhs = rhs rescue expr`
  * 2.7: refactored destructured args (`|(k,v)|`) and unfactored(?!)
    case_body/args.
  * 3.0: excessed_comma
  * 3.0: finished most everything: endless methods, patterns, etc.
  * 3.0: refactored / added new pattern changes
  * Added RubyLexer#in_heredoc? (ie, is there old_ss ?)
  * Added RubyLexer#old_ss and old_lineno and removed much of SSStack(ish).
  * Added Symbol#end_with? when necessary
  * Added TALLY and DEBUG options for ss.getch and ss.scan
  * Added ignore_body_comments to make parser productions more clear.
  * Added support for no_kwarg (eg `def f(**nil)`).
  * Added support for no_kwarg in blocks (eg `f { |**nil| }`).
  * Augmented generated parser files to have frozen_string_literal comments
    and fixed tests.
  * Broke out 3.0 parser into its own to ease development.
  * Bumped dependencies on sexp_processor and oedipus_lex.
  * Clean generated 3.x files.
  * Extracted all string scanner methods to their own module.
  * Fixed some precedence decls.
  * Implemented most of pattern matching for 2.7+.
  * Improve lex_state= to report location in verbose debug mode.
  * Made it easier to debug with a particular version of ruby via rake.
  * Make sure ripper uses the same version of ruby we specified.
  * Moved all string/heredoc/etc code to ruby_lexer_strings.rb
  * Remove warning from newer bisons.
  * Sprinkled in some frozen_string_literal, but mostly helped by oedipus
    bump.
  * Switch to comparing against ruby binary since ripper is buggy.
  * bugs task should try both bug*.rb and bad*.rb.
  * endless methods
  * f_any_kwrest refactoring.
  * refactored defn/defs

o 15 bug fixes:

  * Cleaned a bunch of old hacks. Initializing RubyLexer w/ Parser is
    cleaner now.
  * Corrected some lex_state errors in process_token_keyword.
  * Fixed ancient ruby2 change (use #lines) in ruby_parse_extract_error.
  * Fixed bug where else without rescue only raises on 2.6+
  * Fixed caller for getch and scan when DEBUG=1
  * Fixed comments in the middle of message cascades.
  * Fixed differences w/ symbol productions against ruby 2.7.
  * Fixed dsym to use string_contents production.
  * Fixed error in bdot2/3 in some edge cases. Fixed p_alt line.
  * Fixed heredoc dedenting in the presence of empty lines. (mvz)
  * Fixed some leading whitespace / comment processing
  * Fixed up how class/module/defn/defs comments were collected.
  * Overhauled ripper.rb to deal with buggy ripper w/ yydebug.
  * Removed dsym from literal.
  * Removed tUBANG lexeme but kept it distinct as a method name
    (eg: `def!@`).

(taca)