<!-- DON'T CHANGE THE TEMPLATE --> ## Describe the feature 比如有结构体A和D ``` type A struct{ C int D *D } type D struct{ B int E int } ``` 有切片var as []A,var ds[]D,以类似copier.Copy(&ds,as)的方式,直接把A.D拷贝到ds切片中 <!-- Describe the requested Feature --> ## Motivation 简化代码,不用遍历A切片 <!-- Describe the motivation behind it --> ## Related Issues <!-- Link related issues here -->