78386 - [xpcdom] JS Components give errors at registration

Status: VERIFIED FIXED

(Core :: JavaScript Engine, defect)

Description

[Peter Van der Beken [:peterv]]

When I am starting up a debug xpcdom branch build on Mac for the first time (so
it registers components), I get the following errors on the console:

JS Component Loader: ERROR
q:moz:jst:source:mozilla:dist:viewer_debug:Components:chatzilla-service.js:1
                     TypeError: redeclaration of var nsISupports
JS Component Loader: ERROR
q:moz:jst:source:mozilla:dist:viewer_debug:Components:nsSidebar.js:1
                     TypeError: redeclaration of var nsISupports
JS Component Loader: ERROR
q:moz:jst:source:mozilla:dist:viewer_debug:Components:vxVixenService.js:1
                     TypeError: redeclaration of var nsISupports

All of these components have one thing in common, they have a line that says:
"const nsISupports = Components.interfaces.nsISupports;". Removing this line
fixes the errors, and then the components register normally. Note that only
nsISupports gives this error, other interfaces are ok. Not sure what is going on
here, but I am not seeing this on a trunk build. Is anyone seeing this on other
platforms?

Comment 1

[John Bandhauer]

Shoot. I know what this is. This is the 'tearoff-disambiguator-thingy' on the 
wrapped global object.

I see it on Windows too (now that I look) I can fix this. Thanks.

Comment 2

[John Bandhauer]

fix checked in to xpcdom branch. Thanks.

Comment 3

[Phil Schwartau]

Peter, is this working properly for you now? If so, could you mark
this bug Verified? Thanks - 

Comment 4

[Peter Van der Beken [:peterv]]

Verified.