Merge branch '4.1'

* 4.1:
  [DI] dont fail on missing classes when resource tracking is disabled
  [Validator] Added the missing constraints instance checks

Author: nicolas-grekas

Constraints/BicValidator.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
 use Symfony\Component\Validator\Exception\LogicException;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
 use Symfony\Component\Validator\Exception\UnexpectedValueException;
 
 /**
@@ -29,6 +30,10 @@ class BicValidator extends ConstraintValidator
      */
     public function validate($value, Constraint $constraint)
     {
+        if (!$constraint instanceof Bic) {
+            throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Bic');
+        }
+
         if (null === $value || '' === $value) {
             return;
         }

Constraints/CountValidator.php

@@ -25,6 +25,10 @@ class CountValidator extends ConstraintValidator
      */
     public function validate($value, Constraint $constraint)
     {
+        if (!$constraint instanceof Count) {
+            throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Count');
+        }
+
         if (null === $value) {
             return;
         }

Constraints/UuidValidator.php

@@ -67,14 +67,14 @@ class UuidValidator extends ConstraintValidator
      */
     public function validate($value, Constraint $constraint)
     {
-        if (null === $value || '' === $value) {
-            return;
-        }
-
         if (!$constraint instanceof Uuid) {
             throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Uuid');
         }
 
+        if (null === $value || '' === $value) {
+            return;
+        }
+
         if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedValueException($value, 'string');
         }