Workaround warining of unchecked outer references

The outer reference in this type test cannot be checked at run time

Author: nicolasstucki

doc-tool/src/dotty/tools/dottydoc/model/comment/CommentParser.scala

@@ -219,8 +219,8 @@ trait CommentParser extends util.MemberLookup {
     def name: String
   }
 
-  private final case class SimpleTagKey(name: String) extends TagKey
-  private final case class SymbolTagKey(name: String, symbol: String) extends TagKey
+  private /*final*/ case class SimpleTagKey(name: String) extends TagKey
+  private /*final*/ case class SymbolTagKey(name: String, symbol: String) extends TagKey
 
   /** Something that should not have happened, happened, and Scaladoc should exit. */
   private def oops(msg: String): Nothing =

doc-tool/src/dotty/tools/dottydoc/staticsite/ResourceFinder.scala

@@ -6,7 +6,7 @@ trait ResourceFinder {
   /** If, for some reason, the supplied default files cannot be found - this
     * exception will be thrown in `layouts`.
     */
-  final case class ResourceNotFoundException(message: String) extends Exception(message)
+  /*final*/ case class ResourceNotFoundException(message: String) extends Exception(message)
 
   protected def getResource(r: String): String =
     Option(getClass.getResourceAsStream(r))