class Container {
    Foo foo = void;

    this() {
        foo = Foo();
    }
}

struct Foo {
    void bar() {
        import std.stdio;
        writeln("Foo.bar");
    }
}

struct FooBar {
    void* origin;
    void delegate() barFunc;
    void delegate() caller;

    this(Foo* origin) {
            this.origin = origin;
            this.barFunc = &origin.bar;
            barFunc = &callFunc!7;
    }

    void call() {
        caller();
    }

    void callFunc(int foobared)() {
        barFunc();
    }
}

void main() {
    Container ctx = new Container;
    FooBar foobar = FooBar(&ctx.foo);
    foobar.call;
}