tml_action_has_page()

function tml_action_has_page( $action = '' ) {

    $action = tml_get_action( $action );
    if ( ! $action ) {
        return false;
    }

    $pages = wp_cache_get( 'pages', 'theme-my-login' );
    if ( false === $pages ) {
        $pages = get_posts(
            array(
                'post_name__in'          => array_map( 'tml_get_action_slug', tml_get_actions() ),
                'post_type'              => 'page',
                'nopaging'               => true,
                'update_post_meta_cache' => false,
                'update_post_term_cache' => false,
            )
        );
        wp_cache_set( 'pages', $pages, 'theme-my-login' );
    }

    $pages = wp_list_filter( $pages, array( 'post_name' => $action->get_slug() ) );
    if ( $pages ) {
        return reset( $pages );
    }

    return false;
}

View src/includes/actions.php, line 297 on GitHub