Go, Golang : 遍历结构

Question

http://play.golang.org/p/fJACxhSrXX我想遍历一个结构数组。 func GetTotalWeight(data_arr []struct) int {    total := 0    for _, elem := range data_arr {        total += elem.weight    }    return total }但我收到语法错误   syntax error: unexpected ), expecting {是否可以遍历结构？