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function block_core_navigation_link_build_variations() {
	$post_types = get_post_types( array( 'show_in_nav_menus' => true ), 'objects' );
	$taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'objects' );

	/*
	 * Use two separate arrays as a way to order the variations in the UI.
	 * Known variations (like Post Link and Page Link) are added to the
	 * `built_ins` array. Variations for custom post types and taxonomies are
	 * added to the `variations` array and will always appear after `built-ins.
	 */
	$built_ins  = array();
	$variations = array();

	if ( $post_types ) {
		foreach ( $post_types as $post_type ) {
			$variation = build_variation_for_navigation_link( $post_type, 'post-type' );
			if ( $post_type->_builtin ) {
				$built_ins[] = $variation;
			} else {
				$variations[] = $variation;
			}
		}
	}
	if ( $taxonomies ) {
		foreach ( $taxonomies as $taxonomy ) {
			$variation = build_variation_for_navigation_link( $taxonomy, 'taxonomy' );
			if ( $taxonomy->_builtin ) {
				$built_ins[] = $variation;
			} else {
				$variations[] = $variation;
			}
		}
	}

	return array_merge( $built_ins, $variations );
}