diff --git a/core/lib/Drupal/Component/Utility/String.php b/core/lib/Drupal/Component/Utility/String.php
index 3a8a2b3..60bf969 100644
--- a/core/lib/Drupal/Component/Utility/String.php
+++ b/core/lib/Drupal/Component/Utility/String.php
@@ -6,6 +6,7 @@
  */
 
 namespace Drupal\Component\Utility;
+use Drupal\Core\Url;
 
 /**
  * Provides helpers to operate on strings.
diff --git a/core/modules/simpletest/src/WebTestBase.php b/core/modules/simpletest/src/WebTestBase.php
index 014a795..854c529 100644
--- a/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -1692,6 +1692,9 @@ protected function drupalPostForm($path, $edit, $submit, array $options = array(
             $out = $new;
           }
 
+          if ($path instanceof Url) {
+            $path = $path->toString();
+          }
           $verbose = 'POST request to: ' . $path;
           $verbose .= '<hr />Ending URL: ' . $this->getUrl();
           if ($this->dumpHeaders) {
diff --git a/core/modules/views/src/Plugin/views/field/FieldPluginBase.php b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
index dddb382..e8b3595 100644
--- a/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
+++ b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
@@ -715,7 +715,7 @@ public function buildOptionsForm(&$form, FormStateInterface $form_state) {
         '#title' => $this->t('Text'),
         '#type' => 'textarea',
         '#default_value' => $this->options['alter']['text'],
-        '#description' => $this->t('The text to display for this field. You may include HTML or <a href="@url">Twig</a>. You may enter data from this view as per the "Replacement patterns" below.', array('@url' => CoreUrl::fromUri('http://twig.sensiolabs.org/documentation'))),
+        '#description' => $this->t('The text to display for this field. You may include HTML or <a href="@url">Twig</a>. You may enter data from this view as per the "Replacement patterns" below.', array('@url' => CoreUrl::fromUri('http://twig.sensiolabs.org/documentation')->toString())),
         '#states' => array(
           'visible' => array(
             ':input[name="options[alter][alter_text]"]' => array('checked' => TRUE),