commit c47a905bc22c7a6044a5094619d3e0a2ba6e737d
Author: Erik Stielstra <info@erikstielstra.nl>
Date:   Sun Feb 18 14:04:21 2018 +0100

    2935189-10.patch

diff --git a/core/lib/Drupal/Component/Gettext/PoStreamReader.php b/core/lib/Drupal/Component/Gettext/PoStreamReader.php
index 4f404edf93..8d33cbbdda 100644
--- a/core/lib/Drupal/Component/Gettext/PoStreamReader.php
+++ b/core/lib/Drupal/Component/Gettext/PoStreamReader.php
@@ -227,7 +227,7 @@ private function readHeader() {
    * indicated by MSGSTR or MSGSTR_ARR followed immediately by an MSGID or
    * MSGCTXT (when items closely follow each other).
    *
-   * @return false|null
+   * @return false|void
    *   FALSE if an error was logged, NULL otherwise. The errors are considered
    *   non-blocking, so reading can continue, while the errors are collected
    *   for later presentation.