--- a/wp/wp-includes/template-loader.php	Tue Jun 09 11:14:17 2015 +0000
+++ b/wp/wp-includes/template-loader.php	Mon Oct 14 17:39:30 2019 +0200
@@ -12,7 +12,7 @@
 	do_action( 'template_redirect' );
 
 /**
- * Filter whether to allow 'HEAD' requests to generate content.
+ * Filters whether to allow 'HEAD' requests to generate content.
  *
  * Provides a significant performance bump by exiting before the page
  * content loads for 'HEAD' requests. See #14348.
@@ -43,7 +43,8 @@
 
 if ( defined('WP_USE_THEMES') && WP_USE_THEMES ) :
 	$template = false;
-	if     ( is_404()            && $template = get_404_template()            ) :
+	if     ( is_embed()          && $template = get_embed_template()          ) :
+	elseif ( is_404()            && $template = get_404_template()            ) :
 	elseif ( is_search()         && $template = get_search_template()         ) :
 	elseif ( is_front_page()     && $template = get_front_page_template()     ) :
 	elseif ( is_home()           && $template = get_home_template()           ) :
@@ -53,24 +54,29 @@
 		remove_filter('the_content', 'prepend_attachment');
 	elseif ( is_single()         && $template = get_single_template()         ) :
 	elseif ( is_page()           && $template = get_page_template()           ) :
+	elseif ( is_singular()       && $template = get_singular_template()       ) :
 	elseif ( is_category()       && $template = get_category_template()       ) :
 	elseif ( is_tag()            && $template = get_tag_template()            ) :
 	elseif ( is_author()         && $template = get_author_template()         ) :
 	elseif ( is_date()           && $template = get_date_template()           ) :
 	elseif ( is_archive()        && $template = get_archive_template()        ) :
-	elseif ( is_comments_popup() && $template = get_comments_popup_template() ) :
-	elseif ( is_paged()          && $template = get_paged_template()          ) :
 	else :
 		$template = get_index_template();
 	endif;
 	/**
-	 * Filter the path of the current template before including it.
+	 * Filters the path of the current template before including it.
 	 *
 	 * @since 3.0.0
 	 *
 	 * @param string $template The path of the template to include.
 	 */
-	if ( $template = apply_filters( 'template_include', $template ) )
+	if ( $template = apply_filters( 'template_include', $template ) ) {
 		include( $template );
+	} elseif ( current_user_can( 'switch_themes' ) ) {
+		$theme = wp_get_theme();
+		if ( $theme->errors() ) {
+			wp_die( $theme->errors() );
+		}
+	}
 	return;
 endif;