903672 - whatever prints out "reference to undefined property {foo}" is missing a newline at the end

Status: RESOLVED DUPLICATE of bug 921680

(Core :: JavaScript Engine, defect)

Description

[Andrew McCreight [:mccr8]]

I get a lot of stuff like this is the output of a debug build:
reference to undefined property options.bytes++DOCSHELL 0x7fffd6842c00 == 7 [id = 7]

Comment 1

[Jesse Ruderman]

This wreaks havoc with any testing framework that tries to parse Firefox's output.

Comment 2

[Andrew McCreight [:mccr8]]

It looks like this is JSMSG_UNDEFINED_PROP, which is used in two places:
  http://mxr.mozilla.org/mozilla-central/search?string=JSMSG_UNDEFINED_PROP&filter=[Jj]SMSG_UNDEFINED_PROP

I couldn't figure out what actually might be printing this message.

Fixing the code causing this particular warning may be easier than tracking down what is failing to produce a newline...

Comment 3

[Jesse Ruderman]

I've seen this issue for at least two JS errors in different fiels.