Symfony\Component\Validator\ConstraintViolationList::set PHP Method

    public function set($offset, ConstraintViolation $violation)
    {
        $this->violations[$offset] = $violation;
    }

 /**
  * {@inheritdoc}
  */
 public function set($offset, ConstraintViolationInterface $violation)
 {
     parent::set($offset, $violation);
     $this->violationOffsetsByField = NULL;
     $this->entityViolationOffsets = NULL;
 }