class Opal::Rewriters::InlineArgs::Initializer

def extract_args
  @args.args.each do |arg|
    if @type == :iter
      # block args are not required,
      # so we neeed to tell compiler that required args
      # must be initialized with nil-s
      @initialization << arg.updated(:initialize_iter_arg)
      if arg.children[0] == :_
        if @underscore_found
          # for proc { |_, _| _ }.call(1, 2) result must be 1
          # here we convert all underscore args starting from the 2nd
          # to a "fake" arg
          arg = s(:fake_arg)
        end
        @underscore_found = true
      end
    else
      # required inline def argument like 'def m(req)'
      # no initialization is required
    end
    @inline << arg
  end
end