Program: 161787
Project: 161787
Buggy source:
@Override protected RRElement toRRElement(GrammarToRRDiagram grammarToRRDiagram){
  List<RRElement> rrElementList=new ArrayList<RRElement>();
  for (int i=0; i < expressions.length; i++) {
    Expression expression=expressions[i];
    RRElement rrElement=expression.toRRElement(grammarToRRDiagram);
    if (i < expressions.length - 1 && expression instanceof RuleReference && expressions[i + 1] instanceof Repetition) {
      RuleReference ruleLink=(RuleReference)expression;
      Repetition repetition=(Repetition)expressions[i + 1];
      Expression repetitionExpression=repetition.getExpression();
      if (repetitionExpression instanceof Sequence) {
        Expression[] subExpressions=((Sequence)repetitionExpression).getExpressions();
        if (subExpressions.length == 2 && subExpressions[0] instanceof Literal && subExpressions[1] instanceof RuleReference && ((RuleReference)subExpressions[1]).getRuleName().equals(ruleLink.getRuleName())) {
          Integer maxRepetitionCount=repetition.getMaxRepetitionCount();
          if (maxRepetitionCount == null || maxRepetitionCount > 1) {
            rrElement=new RRLoop(ruleLink.toRRElement(grammarToRRDiagram),subExpressions[0].toRRElement(grammarToRRDiagram),repetition.getMinRepetitionCount(),(maxRepetitionCount == null ? null : maxRepetitionCount));
            i++;
          }
        }
      }
    }
    rrElementList.add(rrElement);
  }
  return new RRSequence(rrElementList.toArray(new RRElement[0]));
}

Fixed version (ground truth):
@Override protected RRElement toRRElement(GrammarToRRDiagram grammarToRRDiagram){
  List<RRElement> rrElementList=new ArrayList<RRElement>();
  for (int i=0; i < expressions.length; i++) {
    Expression expression=expressions[i];
    RRElement rrElement=expression.toRRElement(grammarToRRDiagram);
    if (i < expressions.length - 1 && expression instanceof RuleReference && expressions[i + 1] instanceof Repetition) {
      RuleReference ruleLink=(RuleReference)expression;
      Repetition repetition=(Repetition)expressions[i + 1];
      Expression repetitionExpression=repetition.getExpression();
      if (repetitionExpression instanceof RuleReference && ((RuleReference)repetitionExpression).getRuleName().equals(ruleLink.getRuleName())) {
        Integer maxRepetitionCount=repetition.getMaxRepetitionCount();
        if (maxRepetitionCount == null || maxRepetitionCount > 1) {
          rrElement=new RRLoop(ruleLink.toRRElement(grammarToRRDiagram),null,repetition.getMinRepetitionCount(),(maxRepetitionCount == null ? null : maxRepetitionCount));
          i++;
        }
      }
 else       if (repetitionExpression instanceof Sequence) {
        Expression[] subExpressions=((Sequence)repetitionExpression).getExpressions();
        if (subExpressions.length == 2 && subExpressions[0] instanceof Literal && subExpressions[1] instanceof RuleReference && ((RuleReference)subExpressions[1]).getRuleName().equals(ruleLink.getRuleName())) {
          Integer maxRepetitionCount=repetition.getMaxRepetitionCount();
          if (maxRepetitionCount == null || maxRepetitionCount > 1) {
            rrElement=new RRLoop(ruleLink.toRRElement(grammarToRRDiagram),subExpressions[0].toRRElement(grammarToRRDiagram),repetition.getMinRepetitionCount(),(maxRepetitionCount == null ? null : maxRepetitionCount));
            i++;
          }
        }
      }
    }
    rrElementList.add(rrElement);
  }
  return new RRSequence(rrElementList.toArray(new RRElement[0]));
}