View difference between Paste ID: vDqTFvxj and LAsfKj2S

     /**
      * @Callback()
      */
     public function validatePostalCode(ExecutionContextInterface $context)
     {
         $constraint = new ZipCode([
             'country' => $this->country,
         ]);
         $violations = $context->getValidator()->validate($this->postalCode, $constraint);
 
         foreach ($violations as $violation) {
             /* @var $violation ConstraintViolationInterface */
             $builder = $context->buildViolation($violation->getMessage(), $violation->getParameters());
             $builder->atPath('postalCode')
                 ->setCode($violation->getCode())
                 ->setInvalidValue($violation->getInvalidValue());
 
             // getPlural is only in ConstraintViolation prior to 3.0
             if (method_exists($violation, 'getPlural')) {
                 $builder->setPlural($violation->getPlural());
             }
 
             // getCause is only in ConstraintViolation, not in ConstraintViolationInterface even in v3.0
             if (method_exists($violation, 'getCause')) {
                 $builder->setCause($violation->getCause());
             }
 
             $builder->addViolation();
         }
     }