I imagine few shot learning would kick in for most new language features. A feature may be new to a particular language, but is it really new?
(https://gist.github.com/darius/b463c7089358fe138a6c29286fe2d... paste in painful-to-read format if anyone's really curious. In three parts: intro to language; I ask it to code symbolic differentiation; then a metacircular interpreter.)