Slightly improved efficiency of ::.writeObject(...

Slightly improved efficiency of ::.writeObject() by not creating an
iterator If style over efficiency is preferred then the code should be
this.foreach(out.writeObject)

1 files changed, 2 insertions, 2 deletions

diff --git a/src/library/scala/List.scala b/src/library/scala/List.scala
index c2158b9f2a..7d65d6d35c 100644
--- a/src/library/scala/List.scala
+++ b/src/library/scala/List.scala
@@ -1260,8 +1260,8 @@ final case class ::[B](private var hd: B, private[scala] var tl: List[B]) extend
   import java.io._
 
   private def writeObject(out: ObjectOutputStream) {
-    val i = elements
-    while (i.hasNext) out.writeObject(i.next)
+    var xs: List[B] = this
+    while (!xs.isEmpty) { out.writeObject(xs.head); xs = xs.tail }
     out.writeObject(ListSerializeEnd)
   }