Update to Drupal 8.0.0-beta15. For more information, see: https://www.drupal.org/node/2563023

core/lib/Drupal/Component/Assertion/Handle.php

@@ -0,0 +1,75 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\Component\Assertion\Handle.
+ *
+ * For PHP 5 this contains \AssertionError as well.
+ */
+
+namespace {
+
+if (!class_exists('AssertionError', FALSE)) {
+
+  /**
+   * Emulates PHP 7 AssertionError as closely as possible.
+   *
+   * We force this class to exist at the root namespace for PHP 5.
+   * This class exists natively in PHP 7. Note that in PHP 7 it extends from
+   * Error, not Exception, but that isn't possible for PHP 5 - all exceptions
+   * must extend from exception.
+   */
+  class AssertionError extends Exception {
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($message = '', $code = 0, Exception $previous = NULL, $file = '', $line = 0) {
+      parent::__construct($message, $code, $previous);
+      // Preserve the filename and line number of the assertion failure.
+      $this->file = $file;
+      $this->line = $line;
+    }
+
+  }
+}
+
+}
+
+namespace Drupal\Component\Assertion {
+
+/**
+ * Handler for runtime assertion failures.
+ *
+ * This class allows PHP 5.x to throw exceptions on runtime assertion fails
+ * in the same manner as PHP 7, and sets the ASSERT_EXCEPTION flag to TRUE
+ * for the PHP 7 runtime.
+ *
+ * @ingroup php_assert
+ */
+class Handle {
+
+  /**
+   * Registers uniform assertion handling.
+   */
+  public static function register() {
+    // Since we're using exceptions, turn error warnings off.
+    assert_options(ASSERT_WARNING, FALSE);
+
+    if (version_compare(PHP_VERSION, '7.0.0-dev') < 0) {
+      // PHP 5 - create a handler to throw the exception directly.
+      assert_options(ASSERT_CALLBACK, function($file, $line, $code, $message) {
+        if (empty($message)) {
+          $message = $code;
+        }
+        throw new \AssertionError($message, 0, NULL, $file, $line);
+      });
+    }
+    else {
+      // PHP 7 - just turn exception throwing on.
+      assert_options(ASSERT_EXCEPTION, TRUE);
+    }
+  }
+
+}
+
+}