drools example does not compile in Eclipse.

drools example does not compile in Eclipse. How to reproduce:
1. download drools distribution from https://hudson.qa.jboss.com/hudson/view/Drools%20jBPM/job/drools-5.2.x/3/
2. generate eclipse project using the pom provided: mvn eclipse:eclipse
3. Import project into Eclipse
4. There are several errors in Eclipse

Description Resource Path Location Type
[ERR 102] Line 738:55 mismatched input '||' in rule "end_visit" waltzdb.drl /drools-examples/src/main/resources/org/drools/benchmark/waltzdb line 738 Drools Error

Description Resource Path Location Type
Line 754:0 unexpected exception at input 'rule'. Exception: java.util.EmptyStackException. Stack trace:
java.util.EmptyStackException
at java.util.Stack.peek(Unknown Source)
at java.util.Stack.pop(Unknown Source)
at org.drools.lang.ParserHelper.popParaphrases(ParserHelper.java:409)
at org.drools.lang.ParserHelper.end(ParserHelper.java:723)
at org.drools.lang.DRLParser.rule(DRLParser.java:915)
at org.drools.lang.DRLParser.statement(DRLParser.java:248)
at org.drools.lang.DRLParser.compilationUnit(DRLParser.java:143)
at org.drools.compiler.DrlParser.compile(DrlParser.java:225)
at org.drools.compiler.DrlParser.parse(DrlParser.java:64)
at org.drools.eclipse.DroolsEclipsePlugin.generateParsedResource(DroolsEclipsePlugin.java:414)
at org.drools.eclipse.DroolsEclipsePlugin.generateParsedResource(DroolsEclipsePlugin.java:359)
at org.drools.eclipse.DroolsEclipsePlugin.parseResource(DroolsEclipsePlugin.java:272)
at org.drools.eclipse.builder.DroolsBuilder.parseDRLFile(DroolsBuilder.java:278)
at org.drools.eclipse.builder.DroolsBuilder.parseResource(DroolsBuilder.java:189)
at org.drools.eclipse.builder.DroolsBuilder$DroolsBuildVisitor.visit(DroolsBuilder.java:147)
at org.eclipse.core.internal.resources.Resource$2.visit(Resource.java:112)
at org.eclipse.core.internal.resources.Resource$1.visitElement(Resource.java:64)
at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(ElementTreeIterator.java:82)
at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(ElementTreeIterator.java:86)
at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(ElementTreeIterator.java:86)
at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(ElementTreeIterator.java:86)
at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(ElementTreeIterator.java:86)
at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(ElementTreeIterator.java:86)
at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(ElementTreeIterator.java:86)
at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(ElementTreeIterator.java:86)
at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(ElementTreeIterator.java:86)
at org.eclipse.core.internal.watson.ElementTreeIterator.iterate(ElementTreeIterator.java:127)
at org.eclipse.core.internal.resources.Resource.accept(Resource.java:74)
at org.eclipse.core.internal.resources.Resource.accept(Resource.java:110)
at org.eclipse.core.internal.resources.Resource.accept(Resource.java:94)
at org.drools.eclipse.builder.DroolsBuilder.fullBuild(DroolsBuilder.java:131)
at org.drools.eclipse.builder.DroolsBuilder.build(DroolsBuilder.java:93)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:629)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:172)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:203)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:255)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:258)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:311)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:343)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:242)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
waltzdb.drl /drools-examples/src/main/resources/org/drools/benchmark/waltzdb line 0 Drools Error