UDA on double nested struct

[Sebastiaan Koppe via Digitalmars-d-learn]

Hey, I am trying to get UDAs from a doubly nested struct, to no 
avail:

code
---
import std.traits : hasUDA;
enum hover;
struct Style {
  struct Root {
    auto margin = "10px";
    auto backgroundColor = "white";
    @hover struct Hover {
      auto backgroundColor = "gray";
    }
  }
}
pragma(msg, hasUDA!(Style.Root.Hover, hover));
---

returns false. Bug or no? (Yes, I am generating css at compile 
time.)

Putting it on Root or on Style works as intended;