@delegate fails with "recursive value byline needs type"

[ClaireNeveu]

The following code causes /home/chris/Programming/macrame/macrame/src/test/scala/macrame/PostDelegateFailure.scala:9: recursive value byline needs type

object Post {
   final case class Byline()
}

final case class CleanPost(byline : Option[Post.Byline] = None)

final case class Post(@delegate clean : CleanPost)

[ClaireNeveu]

According to showRaw the tree output here is completely identical to the non-macro case (final case class Post(clean : CleanPost) { def byline = clean.byline } which is baffling to say the least.