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

vendor/doctrine/collections/lib/Doctrine/Common/Collections/Selectable.php

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+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\Common\Collections;
+
+/**
+ * Interface for collections that allow efficient filtering with an expression API.
+ *
+ * Goal of this interface is a backend independent method to fetch elements
+ * from a collections. {@link Expression} is crafted in a way that you can
+ * implement queries from both in-memory and database-backed collections.
+ *
+ * For database backed collections this allows very efficient access by
+ * utilizing the query APIs, for example SQL in the ORM. Applications using
+ * this API can implement efficient database access without having to ask the
+ * EntityManager or Repositories.
+ *
+ * @author Benjamin Eberlei <kontakt@beberlei.de>
+ * @since  2.3
+ */
+interface Selectable
+{
+    /**
+     * Selects all elements from a selectable that match the expression and
+     * returns a new collection containing these elements.
+     *
+     * @param Criteria $criteria
+     *
+     * @return Collection
+     */
+    public function matching(Criteria $criteria);
+}