Code Generator rule "alias" generates stack overflow/error.

[LesBarstow]

When a rule is simply equal to another rule, the generated rule returns itself instead of the other rule.

rule-a = ALPHA / DIGIT
rule-b = rule-a

// rule-a = ALPHA / DIGIT
func RuleA() operators.Operator {
    return operators.Alts(
        "rule-a",
        core.ALPHA(),
        core.DIGIT(),
    )
}
// rule-b = rule-a
func RuleB() operators.Operator {
    return RuleB()  // NOTE - ERROR HERE - should be RuleA
}