Program: 78508
Project: 78508
Buggy source:
public String getDisplayText(Object element){
  if (element instanceof Object[]) {
    if (element instanceof Operator[]) {
      if (element == OPERATORS_ASSIGNMENT) {
        return DISPLAY_TEXT_ASSIGNMENT;
      }
 else       if (element == OPERATORS_COMPARISON) {
        return DISPLAY_TEXT_COMPARISON;
      }
 else       if (element == OPERATORS_COMPUTATIONAL) {
        return DISPLAY_TEXT_COMPUTATIONAL;
      }
 else       if (element == OPERATORS_LOGICAL) {
        return DISPLAY_TEXT_LOGICAL;
      }
    }
 else     if (element instanceof ILocalizableInfo[]) {
      ILocalizableInfo info=((ILocalizableInfo[])element)[1];
      StringBuffer displayText=new StringBuffer(info.getName());
      if (info instanceof IMethodInfo) {
        IMethodInfo method=(IMethodInfo)info;
        displayText.append("String_Node_Str");
        boolean isFirst=true;
        IArgumentInfoList arguments=(IArgumentInfoList)method.argumentListIterator().next();
        for (Iterator iter=arguments.argumentsIterator(); iter.hasNext(); ) {
          IArgumentInfo argInfo=(IArgumentInfo)iter.next();
          if (!isFirst) {
            displayText.append("String_Node_Str");
          }
          isFirst=false;
          if (IArgumentInfo.OPTIONAL_ARGUMENT_NAME.equals(argInfo.getName())) {
            displayText.append(argInfo.getDisplayName());
          }
 else {
            displayText.append(argInfo.getType());
          }
        }
        displayText.append("String_Node_Str");
        String returnType=method.getReturnType();
        if (returnType == null) {
          returnType="String_Node_Str";
        }
        displayText.append(returnType);
      }
 else       if (info instanceof IMemberInfo) {
        displayText.append("String_Node_Str");
        displayText.append(((IMemberInfo)info).getDataType());
      }
      return displayText.toString();
    }
    return ALL;
  }
 else   if (element instanceof String) {
    return (String)element;
  }
 else   if (element instanceof Operator) {
    return ((Operator)element).symbol;
  }
 else   if (element instanceof DesignElementHandle) {
    return ((DesignElementHandle)element).getQualifiedName();
  }
 else   if (element instanceof DataSetItemModel) {
    return ((DataSetItemModel)element).getDisplayName();
  }
  return element.toString();
}

Fixed version (ground truth):
public String getDisplayText(Object element){
  if (element instanceof Object[]) {
    if (element instanceof Operator[]) {
      if (element == OPERATORS_ASSIGNMENT) {
        return DISPLAY_TEXT_ASSIGNMENT;
      }
 else       if (element == OPERATORS_COMPARISON) {
        return DISPLAY_TEXT_COMPARISON;
      }
 else       if (element == OPERATORS_COMPUTATIONAL) {
        return DISPLAY_TEXT_COMPUTATIONAL;
      }
 else       if (element == OPERATORS_LOGICAL) {
        return DISPLAY_TEXT_LOGICAL;
      }
    }
 else     if (element instanceof ILocalizableInfo[]) {
      ILocalizableInfo info=((ILocalizableInfo[])element)[1];
      StringBuffer displayText=new StringBuffer(info.getName());
      if (info instanceof IMethodInfo) {
        IMethodInfo method=(IMethodInfo)info;
        displayText.append("String_Node_Str");
        boolean isFirst=true;
        Iterator argumentListIter=method.argumentListIterator();
        IArgumentInfoList arguments=(IArgumentInfoList)argumentListIter.next();
        for (Iterator iter=arguments.argumentsIterator(); iter.hasNext(); ) {
          IArgumentInfo argInfo=(IArgumentInfo)iter.next();
          if (!isFirst) {
            displayText.append("String_Node_Str");
          }
          isFirst=false;
          displayText.append(argInfo.getDisplayName());
        }
        displayText.append("String_Node_Str");
        if (!argumentListIter.hasNext()) {
          displayText.append("String_Node_Str");
          String returnType=method.getReturnType();
          if (returnType == null) {
            returnType="String_Node_Str";
          }
          displayText.append(returnType);
        }
      }
 else       if (info instanceof IMemberInfo) {
        displayText.append("String_Node_Str");
        displayText.append(((IMemberInfo)info).getDataType());
      }
      return displayText.toString();
    }
    return ALL;
  }
 else   if (element instanceof String) {
    return (String)element;
  }
 else   if (element instanceof Operator) {
    return ((Operator)element).symbol;
  }
 else   if (element instanceof DesignElementHandle) {
    return ((DesignElementHandle)element).getQualifiedName();
  }
 else   if (element instanceof DataSetItemModel) {
    return ((DataSetItemModel)element).getDisplayName();
  }
  return element.toString();
}