Extension Macros and nested types

Using Swift
1

I'm running into some issues when using an extension macro on a nested type that references another nested type. My setup is roughly:

enum Foo {
  struct Bar {
  }
  @MyMacro
  struct Baz {
    let bar: Bar
  }
}
/// Macro Expansion A
extension Foo.Bar { // Error A: `Bar` is private
   var wrappedBar: Bar { ... } // Error B: Cannot find type `Bar` in scope
}
/// Macro Expansion B
extension Bar { // Seems to work
  var wrappedBar: Bar { ... } // Error B: Cannot find type `Bar` in scope
}

Any suggestions on what else I can do here to get this working?