unfortunately, dmd doesn't accept the signature as a valid property.



import std.stdio;
import std.typecons;

struct T {
    int _i;

    @property int i(Nullable!int derp = Nullable!int.init) {
        return _i = derp.isNull ? _i : derp.get;
    }
}
void main () {
    T t;
    t.i = 1;
    writeln(t.i);
}