Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/validator/Constraints/Count.php

@@ -0,0 +1,56 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Exception\MissingOptionsException;
+
+/**
+ * @Annotation
+ * @Target({"PROPERTY", "METHOD", "ANNOTATION"})
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ *
+ * @api
+ */
+class Count extends Constraint
+{
+    const TOO_FEW_ERROR = 1;
+    const TOO_MANY_ERROR = 2;
+
+    protected static $errorNames = array(
+        self::TOO_FEW_ERROR => 'TOO_FEW_ERROR',
+        self::TOO_MANY_ERROR => 'TOO_MANY_ERROR',
+    );
+
+    public $minMessage = 'This collection should contain {{ limit }} element or more.|This collection should contain {{ limit }} elements or more.';
+    public $maxMessage = 'This collection should contain {{ limit }} element or less.|This collection should contain {{ limit }} elements or less.';
+    public $exactMessage = 'This collection should contain exactly {{ limit }} element.|This collection should contain exactly {{ limit }} elements.';
+    public $min;
+    public $max;
+
+    public function __construct($options = null)
+    {
+        if (null !== $options && !is_array($options)) {
+            $options = array(
+                'min' => $options,
+                'max' => $options,
+            );
+        }
+
+        parent::__construct($options);
+
+        if (null === $this->min && null === $this->max) {
+            throw new MissingOptionsException(sprintf('Either option "min" or "max" must be given for constraint %s', __CLASS__), array('min', 'max'));
+        }
+    }
+}