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

core/modules/link/templates/link-formatter-link-separate.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation of a link with separate title and URL elements.
+ *
+ * Available variables:
+ * - link: The link that has already been formatted by l().
+ * - title: (optional) A descriptive or alternate title for the link, which may
+ *   be different than the actual link text.
+ *
+ * @see template_preprocess()
+ * @see template_preprocess_link_formatter_link_separate()
+ *
+ * @ingroup themeable
+ */
+#}
+{% spaceless %}
+  {{ title }}
+  {{ link }}
+{% endspaceless %}