Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/views/templates/views-view-field.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation for a single field in a view.
+ *
+ * It is not actually used in default views, as this is registered as a theme
+ * function which has better performance. For single overrides, the template is
+ * perfectly okay.
+ *
+ * Available variables:
+ * - view: The view that the field belongs to.
+ * - field: The field handler that can process the input.
+ * - row: The raw result of the database query that generated this field.
+ * - output: The processed output that will normally be used.
+ *
+ * When fetching output from the row this construct should be used:
+ * data = row[field.field_alias]
+ *
+ * The above will guarantee that you'll always get the correct data, regardless
+ * of any changes in the aliasing that might happen if the view is modified.
+ *
+ * @see template_preprocess_views_view_field()
+ *
+ * @ingroup themeable
+ */
+#}
+{{ output }}