OptionParser#define_by_keywords

# File tmp/rubies/ruby-3.2.0/lib/optparse/kwargs.rb, line 10
def define_by_keywords(options, meth, **opts)
  meth.parameters.each do |type, name|
    case type
    when :key, :keyreq
      op, cl = *(type == :key ? %w"[ ]" : ["", ""])
      define("--#{name}=#{op}#{name.upcase}#{cl}", *opts[name]) do |o|
        options[name] = o
      end
    end
  end
  options
end