Hi, please reconsider implementation of feature request #6721 planned for Ruby 2.5.0 . Instead of introducing new method `Object#yield_self`, just reuse existing `Object#itself` by taking an optional block argument. Find it much clearer and more logical solution, not superfluous polluting of API space. `Object#itself` just returns target object, optional block would return alternative value with target object passed as block argument. Prototyped sol. in Ruby: ~~~ruby ~~~ class Object def itself block_given? ? yield(self) : self end end ~~~ Not aware of any case, where it would break backward compatibility.