Sorry, minor mistakes ;)
Again:
Thx, Simen.
Unfortunately, this works only for concretet types, but not for type parameters.
Example:
class Test(A) {
    A do_nothing(A x) {
       return x;
    }
}
/* WORKS */
Test!int test() {
    return new Test!(int);
}
/* Error : undefined identifier A */
Test!A test() {
    return new Test!(A);
}