392072 - Incorrect old value passed to watch-handler watching __proto__?

Status: RESOLVED DUPLICATE of bug 638054

(Core :: JavaScript Engine, defect)

Description

[Jeff Walden [:Waldo]]

js> var c = {};
js> c.watch("__proto__", function (p, o, n) {
  if (o !== Object.prototype)
    throw "Er, what???  " + o;
});
js> c.__proto__ = (function(){}).__proto__;
uncaught exception: Er, what???  undefined


I'm reasonably certain this is a bug, but I'm not 100% sure, hence the UNCO.  This definitely appears on trunk, and I think it's on branch as well, but I didn't run this exact test to check.

Comment 1

[André Bargull [:anba]]

watch() was removed in bug 638054.