Can't convert variables using __traits

[Wusiki jeronii]

Hello.
I can't change variable type using __traits.
Code:
```d
     struct Users
     {
     public:
         string login;
         string name;
         string email;
         string icon;
         int type;
     }

     void somefun()
     {
         string[string] test = ["login": "login"];
         Users* user = new Users();
         foreach (member; __traits(allMembers, Users))
             if (member in test)
                 __traits(getMember, *user, member) = 
to!(typeof(member))(test[member]);
     }

```
I get the error:
> Error: cannot implicitly convert expression `to(test["type"])` 
> of type `string` to `int`

Can anoyne explains to me why I can't convert traits member? 
Without traits I can declare string variable and convert it to 
int succesfully.