--- /dev/null
+<?php
+
+/**
+ * @file
+ * Contains PHP5 version of the \AssertionError class.
+ */
+
+/**
+ * Emulates PHP 7 AssertionError as closely as possible.
+ *
+ * This class is declared in the global namespace. It will only be included by
+ * \Drupal\Component\Assertion\Handle for PHP5 since 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;
+ }
+
+}