gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/B_LP_NL_O_P_S_SE_SL_Traverser.java [41:86]:
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        this.nestedLoops = new Stack<>();
        this.loopNames = new ReferenceMap<>(AbstractReferenceMap.ReferenceStrength.HARD,
                AbstractReferenceMap.ReferenceStrength.WEAK);
    }

    /////////////////

    @Override
    public int loops() {
        return this.nestedLoops.peek().count();
    }

    @Override
    public int loops(final String loopName) {
        if (loopName == null)
            return loops();
        else if (this.loopNames.containsKey(loopName))
            return ((LabelledCounter) this.loopNames.get(loopName)).count();
        else
            throw new IllegalArgumentException("Loop name not defined: " + loopName);
    }

    @Override
    public void initialiseLoops(final String stepLabel, final String loopName) {
        if (this.nestedLoops.empty() || !this.nestedLoops.peek().hasLabel(stepLabel)) {
            final LabelledCounter lc = new LabelledCounter(stepLabel, (short) 0);
            this.nestedLoops.push(lc);
            if (loopName != null)
                this.loopNames.put(loopName, lc);
        }
    }

    @Override
    public void incrLoops() {
        this.nestedLoops.peek().increment();
    }

    @Override
    public void resetLoops() {
        this.nestedLoops.pop();
    }

    /////////////////

    @Override
    public <R> Admin<R> split(final R r, final Step<T, R> step) {
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/NL_O_OB_S_SE_SL_Traverser.java [42:87]:
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        this.nestedLoops = new Stack<>();
        this.loopNames = new ReferenceMap<>(AbstractReferenceMap.ReferenceStrength.HARD,
                AbstractReferenceMap.ReferenceStrength.WEAK);
    }

    /////////////////

    @Override
    public int loops() {
        return this.nestedLoops.peek().count();
    }

    @Override
    public int loops(final String loopName) {
        if (loopName == null)
            return loops();
        else if (this.loopNames.containsKey(loopName))
            return ((LabelledCounter) this.loopNames.get(loopName)).count();
        else
            throw new IllegalArgumentException("Loop name not defined: " + loopName);
    }

    @Override
    public void initialiseLoops(final String stepLabel, final String loopName) {
        if (this.nestedLoops.empty() || !this.nestedLoops.peek().hasLabel(stepLabel)) {
            final LabelledCounter lc = new LabelledCounter(stepLabel, (short) 0);
            this.nestedLoops.push(lc);
            if (loopName != null)
                this.loopNames.put(loopName, lc);
        }
    }

    @Override
    public void incrLoops() {
        this.nestedLoops.peek().increment();
    }

    @Override
    public void resetLoops() {
        this.nestedLoops.pop();
    }

    /////////////////

    @Override
    public <R> Admin<R> split(final R r, final Step<T, R> step) {
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