563001 - JM: Browser fails Mochitest content/base/test/test_NodeIterator_mutations_3.html

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[David Mandelin [:dmandelin]]

The wrong value is read from a global variable.

Comment 1

[David Mandelin [:dmandelin]]

I have more info but still not sure what's going on. The test case has code like this:

  var content = expr;
  ... content ...

Fx supports a property |window.content|. The DEFVAR here does a lookup on |content|, which creates a new property on the global. For some reason, we get:

  in TM: prop created on window as enumerate "content": slot 73
  in JM: prop created on window.__proto__ as enumerate shared getter "content":
              slot -1

So in JM the assignment would shadow a readonly and thus has no effect. It's weird that there would be any difference because they are both just calling lookup() in DEFVAR.

Comment 2

[David Mandelin [:dmandelin]]

Works now. Probably got fixed with David's recent update to globals.