Fix for #3204.

that can arise when return types of public facing methods are inferred.
We eventually need some mechanism to make such issues easier to avoid.
No review.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/library/scala/collection/SortedMap.scala b/src/library/scala/collection/SortedMap.scala
index 24f363243f..7b0d35220e 100644
--- a/src/library/scala/collection/SortedMap.scala
+++ b/src/library/scala/collection/SortedMap.scala
@@ -21,9 +21,9 @@ import mutable.Builder
  */
 trait SortedMap[A, +B] extends Map[A, B] with SortedMapLike[A, B, SortedMap[A, B]] {
   /** Needs to be overridden in subclasses. */
-  override def empty = SortedMap.empty[A, B]
+  override def empty: SortedMap[A, B] = SortedMap.empty[A, B]
 
-  override protected[this] def newBuilder : Builder[(A, B), SortedMap[A, B]] =
+  override protected[this] def newBuilder: Builder[(A, B), SortedMap[A, B]] =
     immutable.SortedMap.newBuilder[A, B]
 }