From: "nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@...>
Date: 2023-08-25T16:10:32+00:00
Subject: [ruby-core:114542] [Ruby master Bug#19851] Ripper returns an extra block argument for :params with :args_forward

Issue #19851 has been updated by nobu (Nobuyoshi Nakada).

Backport changed from 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN to 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED

https://github.com/ruby/ruby/pull/8293

----------------------------------------
Bug #19851: Ripper returns an extra block argument for :params with :args_forward
https://bugs.ruby-lang.org/issues/19851#change-104344

* Author: thyresias (Thierry Lambert)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x64-mingw-ucrt]
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
```ruby
require 'ripper'

class BasicParser < Ripper
  EVENTS.each do |event|
    module_eval(<<~RUBY, __FILE__, __LINE__ + 1)
      def on_#{event}(*args)
        puts "#{event}(\#{args.inspect})"
        args.unshift :#{event}
        args
      end
    RUBY
  end
end

BasicParser.new('def m(...); end').parse
# stdout:
# kw(["def"])
# sp([" "])
# ident(["m"])
# lparen(["("])
# op(["..."])
# args_forward([])
# params([nil, nil, nil, nil, nil, [:args_forward], :&])
```
I would have expected the last `:params` argument to be `nil`, not `:&`.



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