模块 Singleton::SingletonInstanceMethods

# File lib/singleton.rb, line 109
def _dump(depth = -1)
  ''
end

# File lib/singleton.rb, line 99
def clone
  raise TypeError, "can't clone instance of singleton #{self.class}"
end

# File lib/singleton.rb, line 104
def dup
  raise TypeError, "can't dup instance of singleton #{self.class}"
end