Ruby

Consider the following code:

 module M def original ; puts __callee__ ; end alias_method :aliased, :original end class A include M end A.new.original #⇒ original A.new.aliased #⇒ aliased 

The above code runs perfectly fine in Ruby 2.1 and returns the actual method name, as it is supposed to be done by Kernel#__callee__.

Surprisingly enough, the code above does not work as expected in Ruby 2.3.1:

 A.new.original #⇒ original A.new.aliased #⇒ original 

The same happens for alias as well.