Program: 67501
Project: 67501
Buggy source:
/** 
 * @param be
 * @param be2
 * @return
 */
public static boolean isEqualExpression(IBaseExpression be,IBaseExpression be2){
  if (be == be2)   return true;
 else   if (be == null || be2 == null)   return false;
  if (be instanceof IScriptExpression && be2 instanceof IScriptExpression) {
    IScriptExpression se=(IScriptExpression)be;
    IScriptExpression se2=(IScriptExpression)be2;
    return isEqualExpression2(se,se2);
  }
 else   if (be instanceof IConditionalExpression && be2 instanceof IConditionalExpression) {
    IConditionalExpression ce=(IConditionalExpression)be;
    IConditionalExpression ce2=(IConditionalExpression)be2;
    return ce.getDataType() == ce2.getDataType() && ce.getOperator() == ce2.getOperator() && isEqualExpression(ce.getExpression(),ce2.getExpression()) && isEqualExpression(ce.getOperand1(),ce2.getOperand1()) && isEqualExpression(ce.getOperand2(),ce2.getOperand2());
  }
 else   if (be instanceof IExpressionCollection && be2 instanceof IExpressionCollection) {
    return be.getDataType() == be2.getDataType() && isEqualExpressionArray(((IExpressionCollection)be).getExpressions(),((IExpressionCollection)be2).getExpressions());
  }
  return false;
}

Fixed version (ground truth):
/** 
 * @param be
 * @param be2
 * @return
 */
public static boolean isEqualExpression(IBaseExpression be,IBaseExpression be2){
  if (be == be2)   return true;
 else   if (be == null || be2 == null)   return false;
  if (be instanceof IScriptExpression && be2 instanceof IScriptExpression) {
    IScriptExpression se=(IScriptExpression)be;
    IScriptExpression se2=(IScriptExpression)be2;
    return isEqualExpression2(se,se2);
  }
 else   if (be instanceof IConditionalExpression && be2 instanceof IConditionalExpression) {
    IConditionalExpression ce=(IConditionalExpression)be;
    IConditionalExpression ce2=(IConditionalExpression)be2;
    return ce.getDataType() == ce2.getDataType() && ce.getOperator() == ce2.getOperator() && isEqualExpression(ce.getExpression(),ce2.getExpression()) && isEqualExpression(ce.getOperand1(),ce2.getOperand1()) && isEqualExpression(ce.getOperand2(),ce2.getOperand2());
  }
 else   if (be instanceof IExpressionCollection && be2 instanceof IExpressionCollection) {
    return be.getDataType() == be2.getDataType() && isEqualExpressionArray(((IExpressionCollection)be).getExpressions(),((IExpressionCollection)be2).getExpressions());
  }
 else   if (be instanceof ICollectionConditionalExpression && be2 instanceof ICollectionConditionalExpression) {
    ICollectionConditionalExpression f1=(ICollectionConditionalExpression)be;
    ICollectionConditionalExpression f2=(ICollectionConditionalExpression)be2;
    if (be.getDataType() != be2.getDataType() || f1.getExpr().size() != f2.getExpr().size() || f1.getOperand().size() != f2.getOperand().size())     return false;
    if (!isEqualExpressionArray(f1.getExpr(),f2.getExpr()))     return false;
    Iterator iter1=f1.getOperand().iterator();
    Iterator iter2=f2.getOperand().iterator();
    while (iter1.hasNext()) {
      if (!isEqualExpressionArray((Collection)iter1.next(),(Collection)iter2.next()))       return false;
    }
    return true;
  }
  return false;
}