2 files changed, 20 insertions, 0 deletions
diff --git a/doc-tool/src/dotty/tools/dottydoc/util/mutate.scala b/doc-tool/src/dotty/tools/dottydoc/util/mutate.scala
index a5a4dfec6..739a1e19d 100644
--- a/doc-tool/src/dotty/tools/dottydoc/util/mutate.scala
+++ b/doc-tool/src/dotty/tools/dottydoc/util/mutate.scala
@@ -35,6 +35,8 @@ object setters {
       e.parent = to
     case e: DefImpl =>
       e.parent = to
+    case e: TypeAliasImpl =>
+      e.parent = to
     case _ => ()
   }
 
diff --git a/doc-tool/src/dotty/tools/dottydoc/util/Traversing.scala b/doc-tool/src/dotty/tools/dottydoc/util/traversing.scala
index a3b60fa44..9c2e3bf54 100644
--- a/doc-tool/src/dotty/tools/dottydoc/util/Traversing.scala
+++ b/doc-tool/src/dotty/tools/dottydoc/util/traversing.scala
@@ -22,4 +22,22 @@ object traversing {
     "../" * (from.path.length - offset) +
     to.path.mkString("", "/", ".html")
   }
+
+
+  def rootPackages(pkgs: Map[String, Package]): List[String] = {
+    var currentDepth = Int.MaxValue
+    var packs = List.empty[String]
+
+    for (key <- pkgs.keys) {
+      val keyDepth = key.split("\\.").length
+      packs =
+        if (keyDepth < currentDepth) {
+          currentDepth = keyDepth
+          key :: Nil
+        } else if (keyDepth == currentDepth) {
+          key :: packs
+        } else packs
+    }
+    packs
+  }
 }