add @since annotations

1 files changed, 5 insertions, 0 deletions

diff --git a/src/library/scala/collection/immutable/IntMap.scala b/src/library/scala/collection/immutable/IntMap.scala
index 5d7d385d8c..0ce61f93b4 100644
--- a/src/library/scala/collection/immutable/IntMap.scala
+++ b/src/library/scala/collection/immutable/IntMap.scala
@@ -50,6 +50,9 @@ private[immutable] object IntMapUtils {
 
 import IntMapUtils._
 
+/**
+ * @since 2.7
+ */
 object IntMap {
   def empty[T] : IntMap[T]  = IntMap.Nil;
   def singleton[T](key : Int, value : T) : IntMap[T] = IntMap.Tip(key, value);
@@ -147,6 +150,8 @@ import IntMap._
  * Specialised immutable map structure for integer keys, based on
  * <a href="http://citeseer.ist.psu.edu/okasaki98fast.html">Fast Mergeable Integer Maps</a>
  * by Okasaki and Gill. Essentially a trie based on binary digits of the the integers.
+ *
+ * @since 2.7
  */
 sealed abstract class IntMap[+T] extends Map[Int, T] with MapLike[Int, T, IntMap[T]] {
   override def empty: IntMap[T] = IntMap.Nil;