struct Inner(T) {

    T value;

    this(ref T value) { this.value = value; }

}

​

struct Outer(T) {

    Inner!T inner;

    void opAssign(ref T rhs) { inner = Inner!T(rhs); }

}

​

@safe void main() {

    int x;

    int* p = &x;

    Outer!(int*) o;

    o = p;

}