How can execute method in new Thread?

[Marcone via Digitalmars-d-learn]

My simple example code:

import std;
struct Fruit {
        string name;
        this(string name){
                this.name = name;
        }

        void printmyname(){
                writeln(this.name);
        }

        void showname(){
		task!this.printmyname().executeInNewThread(); // Error here!! 
Can not send this.printmyname() tonew thread.
        }
}


void main(){
        Fruit f = Fruit("Banana");
        f.showname();
}


Error: 
D:\dmd2\windows\bin\..\..\src\phobos\std\parallelism.d(516): 
Error: struct `Fruit` does not overload ()