FlattenedMembers

static class A {
    int bar;
    string str;
    private int dum;
}

static class B {
    A foo;
    int mid;
}

static class C {
    B baz;
    int top;
}

static class Address {
    int zipcode;
}

static class D {
    Address address;
}

static struct E {
    int foo;
}

static struct F {
    E bar;
}

static assert(FlattenedMembers!C == ["baz", "baz.foo", "baz.foo.bar", "baz.foo.str", "baz.mid", "top"]);
static assert(FlattenedMembers!D == ["address", "address.zipcode"]);
static assert(FlattenedMembers!F == ["bar", "bar.foo"]);