Hi, I have a struct and want to extends its methods, like:
```d
struct Server
{
string name;
string ip;
int port;
string user;
}
```
extension method here:
```d
string prompt(ref in Server server)
{
return server.user ~ "@" ~ server.ip ~ ":" ~ server.port;
}
```
and call it with UFSC:
```d
string p = server.prompt;
```
is this the correct way to use struct and UFCS? it does not seem
to copy there.
