yuicompressor complains findAndModify syntax

[rdong]

The piece of js code is as follows:
.....
a.findAndModify(
{a: a},
[],
{$set: {a: a, b: b, updated_at: new Date()}},
{ new: true, upsert: true }, // line 173
function(err, doc) {
if(err) {
util.logError(logger, "error!", err);
return;
}
}
);
}
.....

got errors when doing compress:
[ERROR] 173:12:invalid property id

[ERROR] 174:26:missing ; before statement

[ERROR] 175:16:missing ; before statement

[ERROR] 176:14:syntax error

[ERROR] 183:5:'try' without 'catch' or 'finally'

[ERROR] 184:9:unlabelled break must be inside loop or switch

[ERROR] 185:7:syntax error

[ERROR] 186:9:missing ; before statement

[ERROR] 209:9:unlabelled break must be inside loop or switch

[ERROR] 211:2:syntax error

[ERROR] 212:8:syntax error

[ERROR] 213:2:syntax error

[ERROR] 1:0:Compilation produced 12 syntax errors.
org.mozilla.javascript.EvaluatorException: Compilation produced 12 syntax errors.
at com.yahoo.platform.yui.compressor.YUICompressor$1.runtimeError(YUICompressor.java:154)
at org.mozilla.javascript.Parser.parse(Parser.java:392)
at org.mozilla.javascript.Parser.parse(Parser.java:337)
at com.yahoo.platform.yui.compressor.JavaScriptCompressor.parse(JavaScriptCompressor.java:312)
at com.yahoo.platform.yui.compressor.JavaScriptCompressor.(JavaScriptCompressor.java:533)
at com.yahoo.platform.yui.compressor.YUICompressor.main(YUICompressor.java:131)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.yahoo.platform.yui.compressor.Bootstrap.main(Bootstrap.java:21)

Please help estimate whether it's a program bug or a wrong usage.
Thanks

[panchenko]

Rhino does not like "new" here, should be the same as #47

[tml]

Agreed, this is javascript keywords again.

[rdong]

thanks for the comments, quote the new keyword solves the problem