activesupport/lib/active_support/core_ext/object/metaclass.rb


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require 'active_support/deprecation'

class Object
  # Get object's meta (ghost, eigenclass, singleton) class.
  #
  # Deprecated in favor of Object#singleton_class.
  def metaclass
    class << self
      self
    end
  end

  deprecate :metaclass => :singleton_class
end