nil_or.rb

class Object 
  def nil_or
    self
  end
  
  def not_nil?
    true
  end
end

class NilProxy
  undef :to_s
  undef :id
  
  def method_missing(*args)
    nil
  end
  def nil?
    true
  end
  def not_nil?
    false
  end
end

class NilClass
  def nil_or
    NilProxy.new
  end

  def not_nil?
    false
  end
end