Ticket #27278: 27278.6.diff

src/wp-includes/theme.php

@@ -1379 +1379 @@
  * The init hook may be too late for some features.
  *
  * @since 2.9.0
- * @param string $feature the feature being added
+ * @param string $feature The feature being added.
+ * @return mixed False if $feature is 'html5' and not passing an array as 2nd argument (empty 2nd arg is deprecated usage).
  */
 function add_theme_support( $feature ) {
         global $_wp_theme_features;
@@ -1398 +1399 @@
                 case 'html5' :
                         // You can't just pass 'html5', you need to pass an array of types.
                         if ( empty( $args[0] ) ) {
+                                // This is deprecated usage, only here for back compat
                                 $args = array( 0 => array( 'comment-list', 'comment-form', 'search-form' ) );
                         } elseif ( ! is_array( $args[0] ) ) {
                                 _doing_it_wrong( "add_theme_support( 'html5' )", 'You need to pass an array of types.', '3.6.1' );