You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: attribute.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.3/lib/active_support/core_ext/class
    
    the code of the file until where you have to start completion: require 'active_support/core_ext/kernel/singleton_class'
require 'active_support/core_ext/module/remove_method'
require 'active_support/core_ext/array/extract_options'

class Class
  # Declare a class-level attribute whose value is inheritable by subclasses.
  # Subclasses can change their own value and it will not impact parent class.
  #
  #   class Base
  #     class_attribute :setting
  #   end
  #
  #   class Subclass < Base
  #   end
  #
  #   Base.setting = true
  #   Subclass.setting            # => true
  #   Subclass.setting = false
  #   Subclass.setting            # => false
  #   Base.setting                # => true
  #
  # In the above case as long as Subclass does not assign a value to setting
  # by performing <tt>Subclass.setting = _something_ </tt>, <tt>Subclass.setting</tt>
  # would read value assigned to parent clas
    
  def class_attribute(*attrs)
    options = attrs.extract_options!
    instance_reader = options.fetch(:instance_accessor, true) && options.fetch(:instance_reader, true)
    instance_writer = options.fetch(:instance_accessor, true) && options.fetch(:instance_writer, true)
    instance_predicate = options.fetch(:instance_predicate, true)

    attrs.each do |name|
      remove_possible_singleton_method(name)
      define_singleton_method(name) { nil }

      remove_possible_singleton_method("#{name}?")
      define_singleton_method("#{name}?") { !!public_send(name) } if instance_predicate

      ivar = "@#{name}"

      remove_possible_singleton_method("#{name}=")
      define_singleton_method("#{name}=") do |val|
        singleton_class.class_eval do
          remove_possible_method(name)
          define_method(name) { val }
        end

        if singleton_class?
          class_eval do
            remove_possible_method(name)
            define_method(name) do
              if instance_variable_defined? ivar
                instance_variable_get ivar
              else
                singleton_class.send name
              end
            end
          end
        end
        val
      end