1216640 - Incorrect operation order in Object.create, Object.defineProperties

Status: RESOLVED DUPLICATE of bug 928083

(Core :: JavaScript: Standard Library, defect)

Description

[André Bargull [:anba]]

Test case for Object.create:
---
Object.create(null, {
  __proto__: {
    get q() {
      print("get q called");
      return {value: 2, writable: true, enumerable: true, configurable: true};
    }
  },
  get p() {
    delete this.q;
    return {value: 1, writable: true, enumerable: true, configurable: true};
  },
  q: null
});
---

Test case for Object.defineProperties:
---
Object.defineProperties({}, {
  __proto__: {
    get q() {
      print("get q called");
      return {value: 2, writable: true, enumerable: true, configurable: true};
    }
  },
  get p() {
    delete this.q;
    return {value: 1, writable: true, enumerable: true, configurable: true};
  },
  q: null
});
---


Expected: "get q called" is not printed
Actual: "get q called" is printed

This is a ES2015 [1] change, the current SM implementation still follows ES5.1.

[1] https://bugs.ecmascript.org/show_bug.cgi?id=2053