1 files changed, 7 insertions, 5 deletions
diff --git a/src/library/scala/collection/immutable/Sequence.scala b/src/library/scala/collection/immutable/Sequence.scala
index 565937335f..715cabb705 100644
--- a/src/library/scala/collection/immutable/Sequence.scala
+++ b/src/library/scala/collection/immutable/Sequence.scala
@@ -12,15 +12,17 @@ import generic._
 /** A subtrait of collection.Sequence which represents sequences
  *  that cannot be mutated.
  */
-trait Sequence[+A] extends Iterable[A] with collection.Sequence[A] with SequenceTemplate[A, Sequence[A]] {
-  override protected[this] def newBuilder = Sequence.newBuilder
-  override def traversableBuilder[B]: Builder[B, Sequence[B]] = Sequence.newBuilder[B]
+trait Sequence[+A] extends Iterable[A]
+                      with collection.Sequence[A]
+                      with TraversableClass[A, Sequence]
+                      with SequenceTemplate[A, Sequence[A]] {
+  override def companion: Companion[Sequence] = Sequence
+
   override def hashCode = (Sequence.hashSeed /: this)(_ * 41 + _.hashCode)
 }
 
 object Sequence extends SequenceFactory[Sequence] {
   private val hashSeed = "Sequence".hashCode
-  type Coll = Sequence[_]
-  implicit def builderFactory[A]: BuilderFactory[A, Sequence[A], Coll] = new BuilderFactory[A, Sequence[A], Coll] { def apply(from: Coll) = from.traversableBuilder[A] }
+  implicit def builderFactory[A]: BuilderFactory[A, Sequence[A], Coll] = new VirtualBuilderFactory[A]
   def newBuilder[A]: Builder[A, Sequence[A]] = new mutable.ListBuffer
 }