Is a multipattern collect supported?

I have a rule which finds all 2 topics and all the students they share
if there is at least 1 such student:

rule "calculateTopicConflict"
     when
         $leftTopic : Topic($id : id);
         $rightTopic : Topic(id > $id);
         $studentSet : HashSet( size > 0 )
             from collect(
                 $student : Student(),
                 $leftTopic.studentList contains $student,
                 $rightTopic.studentList contains $student
             );
     then
         insertLogical(new TopicConflict($leftTopic , $rightTopic ,
$studentSet));
end


This won't compile:
Caused by: org.drools.rule.InvalidRulePackage: [29,36]: unknown:29:36
mismatched token: [@370,1504:1504=',',<11>,29:36]; expecting type
RIGHT_PAREN[30,39]: unknown:30:39 mismatched token:
[@376,1545:1552='contains',<49>,30:39]; expecting type
LEFT_PAREN[30,48]: unknown:30:48 Unexpected token '$student'
        at org.drools.rule.Package.checkValidity(Package.java:424)


Is a multipattern collect supported?

Thanks for your help :)

--
With kind regards,
Geoffrey De Smet

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