variations on class module relationships

class_module.rb

module Mojule
  def self.something
    puts "something!"
  end

  def something_else
    puts "something else!"
  end

  def still_something_else
    puts "still something else!"
  end

  module_function :still_something_else
end

class Klass
  include Mojule
end

class Klass2
  extend Mojule
end

  Mojule.something
# Mojule.something_else
# => class_module_method.rb:18:in `<main>': undefined method `something_else' for Mojule:Module (NoMethodError)
  Mojule.still_something_else
  Mojule::something
# Mojule::something_else
# => class_module_method.rb:23:in `<main>': undefined method `something_else' for Mojule:Module (NoMethodError)
  Mojule::still_something_else

# Klass.something
# => class_module_method.rb:30:in `<main>': undefined method `something' for Klass:Class (NoMethodError)
# Klass.something_else
# => class_module_method.rb:32:in `<main>': undefined method `something_else' for Klass:Class (NoMethodError)
# Klass.still_something_else
# => class_module_method.rb:34:in `<main>': undefined method `still_something_else' for Klass:Class (NoMethodError)
# Klass.new.something
# => class_module_method.rb:37:in `<main>': undefined method `something' for #<Klass:0x00000000a2c970> (NoMethodError)
  Klass.new.something_else
# Klass.new.still_something_else
# => class_module_method.rb:41:in `<main>': private method `still_something_else' called for #<Klass:0x00000002592930> (NoMethodError)

# Klass2.something
# => class_module_method.rb:45:in `<main>': undefined method `something' for Klass2:Class (NoMethodEr
  Klass2.something_else
# Klass2.still_something_else
# => class_module_method.rb:48:in `<main>': private method `still_something_else' called for Klass2:Class (NoMethodError)
# Klass2.new.something
# => class_module_method.rb:50:in `<main>': undefined method `something' for #<Klass2:0x000000027409a8> (NoMethodError)
# Klass2.new.something_else
# => class_module_method.rb:52:in `<main>': undefined method `something_else' for #<Klass2:0x00000001341a60> (NoMethodError)
# Klass2.new.still_something_else
# => class_module_method.rb:54:in `<main>': undefined method `still_something_else' for #<Klass2:0x00000001268a30> (NoMethodError)