In RS:ClassDefinitionEvaluation of https://arai-a.github.io/ecma262-compare/?pr=2417, we invoke PrivateMethodOrAccessorAdd on each element of staticPrivateMethod, but staticPrivateMethod is not defined in previous steps.

I am wondering for a static private accessor:

class C { static accessor #p }

at which step is the private name #p registered to C.[[PrivateElements]]? I feel like it should be handled in PrivateMethodOrAccessorAdd just like getter/setter, and its BackingStorageKey will be registered in InitializeFieldOrAccessor separately.

This can be observed from a half-constructed class:

try {
  var halfConstructed;
  class C {
  static test() {
    #x in C; //true or false?
    }
  static accessor #x;
  static accessor #y = (() => {
    halfConstructed = C;
    throw new Error;
  })();
  }
} catch {
  halfConstructed.test()
}