Compilation error occurs for rules written in MVEL dialect and using the enhanced "for" (foreach) statement in executable model.

Issue

Building rules written in MVEL dialect and using the enhanced for (foreach) statement with executable rule model enabled causes an error.

When I build a maven project which contains rules using the enhanced for statement like (*1) with executable model enabled,

package com.example.reproducer

import java.util.ArrayList
import com.example.reproducer.Bus

dialect "mvel"

rule "bus1"
    when
        $buses : ArrayList() from collect ( Bus() )
    then
        for ( Bus : $buses ) {                  // ..... (*1)
            System.out.println("bus: " + bus);
        }
end

build error occurs at the enhanced for statement with the messages like below.

$ mvn clean compile -DgenerateModel=YES
...
[ERROR] Unable to build KieBaseModel:rules
CompilationProblemErrorResult: org.drools.mvelcompiler.MvelCompilerException: Type check of for (Bus bus : $buses) {
 System.out.println("bus: " + bus);
} failed.
...