reattach method

gistfile1.txt

irb(main):001:0> receiver = Object.new
=> #<Object:0x007fc4a1939320>
irb(main):002:0> original = receiver.method(:to_s)
=> #<Method: Object(Kernel)#to_s>
irb(main):003:0> original == receiver.method(:to_s)
=> true
irb(main):004:0> receiver.define_singleton_method(:to_s, original)
=> :to_s
irb(main):005:0> original == receiver.method(:to_s)
=> false
irb(main):006:0>