Error in 5.2.0.M2 accumulate function. Works in 5.0 and 5.2.0.M1

When loading the rule below the exception below occurs. The rule works and test passes in 5.0.1 and in 5.2.0.M1. A self contained unit test has been emailed to the development team.

*********************Rule************************************
package accumsTest

import java.util.Map;
import java.util.ArrayList;

dialect "mvel"

rule "Accum test rule"
salience 155
when

$episode: Map()
$commonVisits : ArrayList() from accumulate( Map( $selectedCv : this["KEY"] != null) from $episode
init(ArrayList selIns = new ArrayList(),
action(selIns.addAll($selectedCv),
result(selIns)
)

then
System.out.println("HIT");
retract($episode);
end

***************************Exception*******************************

[15,21]: [ERR 102] Line 15:21 mismatched input 'init' in rule "Accum test rule"
java.lang.IllegalArgumentException: Could not parse knowledge.
at com.recondotech.droolsTest.AccumTest.readKnowledgeBase(AccumTest.java:40)
at com.recondotech.droolsTest.AccumTest.testUpdate(AccumTest.java:21)
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:592)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)