Go and Rust – objects without class (2013)(lwn.net)

  * cheap field access from internal methods;
  * cheap dynamic dispatch of methods;
  * cheap downcasting;
  * thin pointers;
  * sharing of fields and methods between definitions;
  * safe, i.e., doesn't require a bunch of transmutes or other unsafe code to be usable;
  * syntactically lightweight or implicit upcasting;
  * calling functions through smartpointers, e.g. fn foo(JSRef<T>, ...);
  * static dispatch of methods.