I actually have a solution in mind for this.
Under the current proposal, a method containing super is "statically bound" to
a specific object that provides the [[Prototype]] base for the "super" property
lookup. This is normally done by defining the method in the context of an
object literal or class declaration. If you want to define a method containing
outside such a context you still need to provide the necessary binding.
What I have in mind is adding a reflection function for doing that:
let f= function () {return super.f()};
f(); //TypeError -- super unbound
let sup = {foo() {return "super hello"};
let sub = sup <| {};
Object.defineMethod(sub,"foo",f}; //adds f as property named "foo" of sub.
binds super for f
f(); // super hello
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