Condition and Filter do not have to return boolean in JASS

[tdauth]

JASS Filter and Condition functions do not have to return boolean or lead to exception:

call TriggerRegisterEnterRegion(CreateTrigger(), r, Filter(function s__Indexer_onEnter))

function s__Indexer_onEnter takes nothing returns nothing
    call s__Indexer_index(GetFilterUnit())
endfunction


    function s__UnitEventEx__UnitEventEx_UnitEventEx__UnitEventExCore___onEnter takes nothing returns nothing
        local unit u= GetFilterUnit()
        local integer id= (GetUnitUserData((u))) // INLINED!!
        local integer cargo_id= (GetUnitUserData((UnitEventEx__CargoUnit[id]))) // INLINED!!

            // onEnter occurs AFTER onIndex

        // The unit was dead, but has re-entered the map. Used to detect when a Meat Wagon unloads a corpse.
        if id > 0 then
            if not IsUnitLoaded(u) and UnitEventEx__CargoUnit[id] != null then
                call s__UnitEventEx__UnitEventEx_UnitEventEx__UnitEventExCore___unload(u)
            endif
        endif

        set u=null
    endfunction


call TriggerRegisterEnterRegion(CreateTrigger(), s__WorldBounds_worldRegion, Condition(function s__UnitEventEx__UnitEventEx_UnitEventEx__UnitEventExCore___onEnter))

This code leads to this exception:

Caused by: java.lang.IllegalStateException: Unable to convert com.etheller.interpreter.ast.value.DummyJassValue@51f0ac09 to boolean
	at com.etheller.interpreter.ast.value.visitor.BooleanJassValueVisitor.accept(BooleanJassValueVisitor.java:60)
	at com.etheller.interpreter.ast.value.visitor.BooleanJassValueVisitor.accept(BooleanJassValueVisitor.java:16)
	at com.etheller.interpreter.ast.value.DummyJassValue.visit(DummyJassValue.java:8)
	at com.etheller.warsmash.parsers.jass.triggers.BoolExprCondition.evaluate(BoolExprCondition.java:22)
	at com.etheller.interpreter.ast.scope.GlobalScope.queueTrigger(GlobalScope.java:698)
	at com.etheller.warsmash.viewer5.handlers.w3x.simulation.region.CRegionTriggerEnter.fire(CRegionTriggerEnter.java:26)
	at com.etheller.warsmash.viewer5.handlers.w3x.simulation.region.CRegionManager.onUnitEnterRegion(CRegionManager.java:192)
	at com.etheller.warsmash.viewer5.handlers.w3x.simulation.CUnit$RegionCheckerImpl.call(CUnit.java:4427)
	at com.etheller.warsmash.viewer5.handlers.w3x.simulation.region.CRegionManager$RegionChecker.onIntersect(CRegionManager.java:78)
	at com.etheller.warsmash.viewer5.handlers.w3x.simulation.region.CRegionManager$RegionChecker.onIntersect(CRegionManager.java:62)

but works in Warcraft III. I had to change the return types of s__Indexer_onEnter and s__UnitEventEx__UnitEventEx_UnitEventEx__UnitEventExCore___onEnter to boolean and return false to fix it for Warsmash.

Warsmash should accept return type nothing in this case to emulate Warcraft's behavior.