Passing struct parameter

How am I suppose to pass a struct argument to the `basic` rpc example?

So far I did that and got the panic shown in the comment:
```golang
type Arg struct {
Name string
}

type Greeter interface {
Greet(*Arg) string
}

type GreeterRPC struct{ client *rpc.Client }

func (g *GreeterRPC) Greet(args *Arg) string {
var resp string
err := g.client.Call("Plugin.Greet", args, &resp)
if err != nil {

// panic: gob: local interface type *interface {} can only be decoded
// from remote interface type; received concrete type Arg
panic(err)

}

return resp
}

```

I'm not very familiar with rpc but the `net/rpc` package tests works and are pretty straightforward.
```golang
args = &Args{7, 8}
reply = new(Reply)
err = client.Call("Arith.Mul", args, reply)
```

Am I missing something?