gistfile1.txt

>> class << Object.new.freeze
>>   puts "ohai"
>>   end
RuntimeError: can't modify frozen object
	from kernel/delta/rubinius.rb:130:in `add_method'
	from kernel/delta/rubinius.rb:190:in `attach_method'
	from (irb):32
	from kernel/common/block_environment.rb:75:in `call_on_instance'
	from kernel/common/eval.rb:72:in `eval'
	from kernel/common/kernel19.rb:44:in `loop'
	from kernel/common/throw_catch19.rb:8:in `catch'
	from kernel/common/throw_catch.rb:10:in `register'
	from kernel/common/throw_catch19.rb:7:in `catch'
	from kernel/common/throw_catch19.rb:8:in `catch'
	from kernel/common/throw_catch.rb:10:in `register'
	from kernel/common/throw_catch19.rb:7:in `catch'
	from kernel/delta/codeloader.rb:67:in `load_script'
	from kernel/delta/codeloader.rb:109:in `load_script'
	from kernel/loader.rb:632:in `script'
	from kernel/loader.rb:836:in `main'