golang一行代码计算函数运行时间

package main import(         "fmt"         "time" ) func main(){         defer timeCost(time.Now())         fmt.Println("start program")         time.Sleep(5*time.Second)         fmt.Println("finish program") } func timeCost(start time.Time){         terminal:=time.Since(start)         fmt.Println(terminal) }