Program: 166673
Project: 166673
Buggy source:
public boolean derivedTask(final Task task,final boolean revised,final boolean single,final boolean overlapAllowed,final boolean addToMemory){
  if ((task.sentence.isGoal() || task.sentence.isQuest()) && (task.sentence.term instanceof Implication || task.sentence.term instanceof Equivalence)) {
    return false;
  }
  if (!task.budget.aboveThreshold()) {
    memory.removeTask(task,"String_Node_Str");
    return false;
  }
  if (task.sentence != null && task.sentence.truth != null) {
    final float conf=task.sentence.truth.getConfidence();
    if (conf < Parameters.TRUTH_EPSILON) {
      memory.removeTask(task,"String_Node_Str");
      return false;
    }
  }
  if (task.sentence.term instanceof Operation) {
    final Operation op=(Operation)task.sentence.term;
    if (op.getSubject() instanceof Variable || op.getPredicate() instanceof Variable) {
      memory.removeTask(task,"String_Node_Str");
      return false;
    }
  }
  final Stamp stamp=task.sentence.stamp;
  if (!overlapAllowed) {
    final int stampLength=stamp.baseLength;
    for (int i=0; i < stampLength; i++) {
      final long baseI=stamp.evidentialBase[i];
      for (int j=0; j < stampLength; j++) {
        if ((!single && this.evidentalOverlap) || ((i != j) && (baseI == stamp.evidentialBase[j]))) {
          memory.removeTask(task,"String_Node_Str");
          return false;
        }
      }
    }
  }
  task.setElemOfSequenceBuffer(false);
  if (!revised) {
    task.getBudget().setDurability(task.getBudget().getDurability() * Parameters.DERIVATION_DURABILITY_LEAK);
    task.getBudget().setPriority(task.getBudget().getPriority() * Parameters.DERIVATION_PRIORITY_LEAK);
  }
  memory.event.emit(Events.TaskDerive.class,task,revised,single);
  if (addToMemory) {
    addTask(task,"String_Node_Str");
  }
  return true;
}

Fixed version (ground truth):
public boolean derivedTask(final Task task,final boolean revised,final boolean single,final boolean overlapAllowed,final boolean addToMemory){
  if ((task.sentence.isGoal() || task.sentence.isQuest()) && (task.sentence.term instanceof Implication || task.sentence.term instanceof Equivalence)) {
    return false;
  }
  if (!task.budget.aboveThreshold()) {
    memory.removeTask(task,"String_Node_Str");
    return false;
  }
  if (task.sentence != null && task.sentence.truth != null) {
    final float conf=task.sentence.truth.getConfidence();
    if (conf < Parameters.TRUTH_EPSILON) {
      memory.removeTask(task,"String_Node_Str");
      return false;
    }
  }
  if (task.sentence.term instanceof Operation) {
    final Operation op=(Operation)task.sentence.term;
    if (op.getSubject() instanceof Variable || op.getPredicate() instanceof Variable) {
      memory.removeTask(task,"String_Node_Str");
      return false;
    }
  }
  if (task.sentence.term.cloneDeep() == null) {
    memory.removeTask(task,"String_Node_Str");
    return false;
  }
  final Stamp stamp=task.sentence.stamp;
  if (!overlapAllowed) {
    final int stampLength=stamp.baseLength;
    for (int i=0; i < stampLength; i++) {
      final long baseI=stamp.evidentialBase[i];
      for (int j=0; j < stampLength; j++) {
        if ((!single && this.evidentalOverlap) || ((i != j) && (baseI == stamp.evidentialBase[j]))) {
          memory.removeTask(task,"String_Node_Str");
          return false;
        }
      }
    }
  }
  task.setElemOfSequenceBuffer(false);
  if (!revised) {
    task.getBudget().setDurability(task.getBudget().getDurability() * Parameters.DERIVATION_DURABILITY_LEAK);
    task.getBudget().setPriority(task.getBudget().getPriority() * Parameters.DERIVATION_PRIORITY_LEAK);
  }
  memory.event.emit(Events.TaskDerive.class,task,revised,single);
  if (addToMemory) {
    addTask(task,"String_Node_Str");
  }
  return true;
}