Issue #19851 has been reported by thyresias (Thierry Lambert). ---------------------------------------- Bug #19851: Ripper returns and extra block argument for :params with :args_forward https://bugs.ruby-lang.org/issues/19851 * 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: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- ```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 `:&`. -- https://bugs.ruby-lang.org/