class Squares
  class << self
    def []=(k, v)
      puts "Squares[#{k.inspect}] = #{v.inspect}"
    end
 
    def [](k)
      puts "Squares[#{k.inspect}]"
      k
    end
  end
end
 
Attribute = Struct.new(:result) do
  def value=(v)
    puts "Attribute{#{result.inspect}}#value = #{v.inspect}"
  end
 
  def value
    puts "Attribute{#{result.inspect}}#value"
    result
  end
end
 
# Array accessor
Squares[true] ||= nil
Squares[false] ||= nil
 
# Getter+setter methods
Attribute.new(true).value  ||= nil
Attribute.new(false).value ||= nil
 

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