832011 - Assertion with Components.lookupMethod(canvas, "itemProp")

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, defect)

Description

[Jesse Ruderman]

Attachment: testcase

Assertion failure: !aIID.Equals((::nsISupports::COMTypeInfo<int>::kIID)), at content/base/src/nsDOMTokenList.cpp:37

Maybe a regression from bug 830231?  Or yet another reason for bug 693733?

Note this only happens for
  Components.lookupMethod(canvas, "itemProp")
and not for
  Object.getOwnPropertyDescriptor(canvas.__proto__, "itemProp").set
  Object.getOwnPropertyDescriptor(canvas.__proto__, "itemProp").get

Comment 1

[Boris Zbarsky [:bzbarsky]]

nsDOMTokenList doesn't actually QI to nsISupports on trunk.

Definitely a regression from bug 830231.  NS_INTERFACE_TABLE1 does both the given interface and nsISupports.

Comment 2

[David Zbarsky (:dzbarsky)]

Attachment: Patch

Comment 3

[Boris Zbarsky [:bzbarsky]]

Comment on attachment 703590 [details] [diff] [review]
Patch

Please add a testcase!

r=me

Comment 4

[David Zbarsky (:dzbarsky)]

https://hg.mozilla.org/integration/mozilla-inbound/rev/46f8c89e1e53

Comment 5

[:Ms2ger (he/him; ⌚ UTC+1/+2)]

https://hg.mozilla.org/mozilla-central/rev/46f8c89e1e53