commit 8918472e14041b1033ddf0eca6a57efb2ba1f59c
Author: Joel Pittet <joel@pittet.ca>
Date:   Mon Mar 31 18:47:15 2014 -0700

    convert field__node__title

diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 3276d3d..f435e1e 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2438,17 +2438,24 @@ function template_preprocess_field(&$variables, $hook) {
   $variables['title_attributes'] = isset($variables['title_attributes']) ? new Attribute($variables['title_attributes']) : clone($default_attributes);
   $variables['content_attributes'] = isset($variables['content_attributes']) ? new Attribute($variables['content_attributes']) : clone($default_attributes);
 
-  // Modules (e.g., rdf.module) can add field item attributes (to
-  // $item->_attributes) within hook_entity_prepare_view(). Some field
-  // formatters move those attributes into some nested formatter-specific
-  // element in order have them rendered on the desired HTML element (e.g., on
-  // the <a> element of a field item being rendered as a link). Other field
-  // formatters leave them within $element['#items'][$delta]['_attributes'] to
-  // be rendered on the item wrappers provided by field.html.twig.
+  // We want other preprocess functions and the theme implementation to have
+  // fast access to the field item render arrays. The item render array keys
+  // (deltas) should always be numerically indexed starting from 0, and looping
+  // on those keys is faster than calling element_children() or looping on all
+  // keys within $element, since that requires traversal of all element
+  // properties.
   $variables['items'] = array();
   $delta = 0;
   while (!empty($element[$delta])) {
     $variables['items'][$delta]['value'] = $element[$delta];
+
+    // Modules (e.g., rdf.module) can add field item attributes (to
+    // $item->_attributes) within hook_entity_prepare_view(). Some field
+    // formatters move those attributes into some nested formatter-specific
+    // element in order have them rendered on the desired HTML element (e.g., on
+    // the <a> element of a field item being rendered as a link). Other field
+    // formatters leave them within $element['#items'][$delta]['_attributes'] to
+    // be rendered on the item wrappers provided by field.html.twig.
     $variables['items'][$delta]['attributes'] = !empty($element['#items'][$delta]->_attributes) ? new Attribute($element['#items'][$delta]->_attributes) : clone($default_attributes);
     $delta++;
   }
diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index a5f0b00..b80b1d3 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -705,23 +705,6 @@ function template_preprocess_node(&$variables) {
 }
 
 /**
- * Returns HTML for the node title field.
- *
- * This is an override of theme_field() for the node title field. See that
- * function for documentation about its details and overrides.
- *
- * @param array $variables
- *   An associative array. See theme_field() for details.
- *
- * @see theme_field()
- *
- * @ingroup themeable
- */
-function theme_field__node__title($variables) {
-  return '<span' . $variables['attributes'] . '>' . drupal_render($variables['items']) . '</span>';
-}
-
-/**
  * Implements hook_permission().
  */
 function node_permission() {
diff --git a/core/modules/node/templates/field--node--title.html.twig b/core/modules/node/templates/field--node--title.html.twig
new file mode 100644
index 0000000..e0dda0f
--- /dev/null
+++ b/core/modules/node/templates/field--node--title.html.twig
@@ -0,0 +1,37 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a field.
+ *
+ * To override output, copy the "field.html.twig" from the templates directory
+ * to your theme's directory and customize it, just like customizing other
+ * Drupal templates such as page.html.twig or node.html.twig.
+ *
+ * For example, for a field named 'body' displayed on the 'article' content
+ * type, any of the following templates will override this default
+ * implementation. The first of these templates that exists is used:
+ * - field--body--article.html.twig
+ * - field--article.html.twig
+ * - field--body.html.twig
+ * - field.html.twig
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the containing element.
+ * - label_hidden: Whether to show the field label or not.
+ * - title_attributes: HTML attributes for the title.
+ * - label: The label for the field.
+ * - content_attributes: HTML attributes for the content.
+ * - items: List of all the field items. Each item contains:
+ *   - attributes: List of HTML attributes for each item.
+ *   - value: The field item's value.
+ *
+ * @see template_preprocess_field()
+ *
+ * @ingroup themeable
+ */
+#}
+<span{{ attributes }}>
+  {%- for item in items -%}
+    {{ item.value }}
+  {%- endfor -%}
+</span>