private boolean mightStopAtVariable(@Nullable Variable var, int segmentNumber) {
    if (var == null) return false;
    if (var.isAlwaysStopAt()) return true;
    return var.getDefaultValueExpression().calculateQuickResult(getExpressionContextForSegment(segmentNumber)) == null;
  }
private boolean mightStopAtVariable(@Nullable Variable var, int segmentNumber)