The point of a language feature is to have support in the syntax and in the compiler for it. Going down that lane, you could say that C has always had object-or

The point of a language feature is to have support in the syntax and in the compiler for it. Going down that lane, you could say that C has always had object-oriented polymorphism, because you can manually insert pointers to tables of functions in your data structures, and call it just verbose syntax for the virtual methods featured in C++.