ruby--ruby/spec/ruby/core/struct/fixtures/classes.rb

module StructClasses

  class Apple < Struct; end

  Ruby = Struct.new(:version, :platform)

  Car = Struct.new(:make, :model, :year)

  class Honda < Car
    def initialize(*args)
      self.make = "Honda"
      super(*args)
    end
  end

  class SubclassX < Struct
  end

  class SubclassX
    attr_reader :key
    def initialize(*)
      @key = :value
      super
    end
  end
end