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

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class Object

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  # Get object's meta (ghost, eigenclass, singleton) class

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  def metaclass

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    class << self

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      self

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    end

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  end

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  # If class_eval is called on an object, add those methods to its metaclass

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  def class_eval(*args, &block)

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    metaclass.class_eval(*args, &block)

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  end

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end

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