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diff --git a/vendor/symfony/validator/Constraints/Collection.php b/vendor/symfony/validator/Constraints/Collection.php
new file mode 100644
index 000000000..ac1edd3b5
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+++ b/vendor/symfony/validator/Constraints/Collection.php
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+<?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\Exception\ConstraintDefinitionException;
+
+/**
+ * @Annotation
+ * @Target({"PROPERTY", "METHOD", "ANNOTATION"})
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class Collection extends Composite
+{
+    const MISSING_FIELD_ERROR = '2fa2158c-2a7f-484b-98aa-975522539ff8';
+    const NO_SUCH_FIELD_ERROR = '7703c766-b5d5-4cef-ace7-ae0dd82304e9';
+
+    protected static $errorNames = array(
+        self::MISSING_FIELD_ERROR => 'MISSING_FIELD_ERROR',
+        self::NO_SUCH_FIELD_ERROR => 'NO_SUCH_FIELD_ERROR',
+    );
+
+    public $fields = array();
+    public $allowExtraFields = false;
+    public $allowMissingFields = false;
+    public $extraFieldsMessage = 'This field was not expected.';
+    public $missingFieldsMessage = 'This field is missing.';
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($options = null)
+    {
+        // no known options set? $options is the fields array
+        if (is_array($options)
+            && !array_intersect(array_keys($options), array('groups', 'fields', 'allowExtraFields', 'allowMissingFields', 'extraFieldsMessage', 'missingFieldsMessage'))) {
+            $options = array('fields' => $options);
+        }
+
+        parent::__construct($options);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function initializeNestedConstraints()
+    {
+        parent::initializeNestedConstraints();
+
+        if (!is_array($this->fields)) {
+            throw new ConstraintDefinitionException(sprintf('The option "fields" is expected to be an array in constraint %s', __CLASS__));
+        }
+
+        foreach ($this->fields as $fieldName => $field) {
+            // the XmlFileLoader and YamlFileLoader pass the field Optional
+            // and Required constraint as an array with exactly one element
+            if (is_array($field) && count($field) == 1) {
+                $this->fields[$fieldName] = $field = $field[0];
+            }
+
+            if (!$field instanceof Optional && !$field instanceof Required) {
+                $this->fields[$fieldName] = $field = new Required($field);
+            }
+        }
+    }
+
+    public function getRequiredOptions()
+    {
+        return array('fields');
+    }
+
+    protected function getCompositeOption()
+    {
+        return 'fields';
+    }
+}