cannot-modify-frozen-class.rb

mathie@Tullibardine ~ (master) $ irb
>> class Foo
>>   def bar
>>     "bar"
>>   end
>> end
=> nil
>> Foo.new.bar
=> "bar"
>> class Foo
>>   def baz
>>     "baz"
>>   end
>> end
=> nil
>> Foo.new.baz
=> "baz"
>> Foo.freeze
=> Foo
>> class Foo
>>   def cheese
>>     "cheese"
>>   end
>> end
TypeError: can't modify frozen class
	from (irb):15
>>