Gem::Deprecate#rubygems_deprecate_command

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/deprecate.rb, line 151
def rubygems_deprecate_command(version = nil)
  class_eval do
    define_method "deprecated?" do
      true
    end

    define_method "deprecation_warning" do
      version ||= Gem::Deprecate.next_rubygems_major_version
      msg = [
        "#{command} command is deprecated",
        ". It will be removed in Rubygems #{version}.\n",
      ]

      alert_warning msg.join.to_s unless Gem::Deprecate.skip
    end
  end
end