// code placeholder

type Data struct {
   Name string `bson:"name"`
}

type Demo struct {
   Total []Total `bson:"total"`
   Data  []Data  `bson:"data"`
}

var new = Demo{
   Total: []Total{
      {
         Count: 100,
      },
   },
   Data: []Data{
      {
         "Alice",
      },
   },
}

type receiver struct {
   Total interface{}
   Data  interface{}
}

func TestUnmarshalBson(t *testing.T) {
   // a,b not get the value I want
   a := make([]Total, 0)
   b := make([]Data, 0)
   recv := receiver{
      Total: &a,
      Data:  &b,
   }
}