Fixes #4709.

Review by extempore.

3 files changed, 19 insertions, 3 deletions

diff --git a/src/library/scala/collection/generic/GenSeqFactory.scala b/src/library/scala/collection/generic/GenSeqFactory.scala
index 58b76aed45..ee6ecae3c2 100644
--- a/src/library/scala/collection/generic/GenSeqFactory.scala
+++ b/src/library/scala/collection/generic/GenSeqFactory.scala
@@ -11,8 +11,16 @@
 package scala.collection
 package generic
 
+import annotation.bridge
+
 /** A template for companion objects of Seq and subclasses thereof.
  *
  *  @since 2.8
  */
-abstract class GenSeqFactory[CC[X] <: GenSeq[X] with GenericTraversableTemplate[X, CC]] extends GenTraversableFactory[CC]
+abstract class GenSeqFactory[CC[X] <: GenSeq[X] with GenericTraversableTemplate[X, CC]]
+extends GenTraversableFactory[CC] {
+
+  @bridge
+  def unapplySeq[A](x: GenSeq[A]): Some[GenSeq[A]] = Some(x)
+
+}
diff --git a/src/library/scala/collection/generic/SeqFactory.scala b/src/library/scala/collection/generic/SeqFactory.scala
index c152a89528..7bd92173ff 100644
--- a/src/library/scala/collection/generic/SeqFactory.scala
+++ b/src/library/scala/collection/generic/SeqFactory.scala
@@ -11,8 +11,6 @@
 package scala.collection
 package generic
 
-import annotation.bridge
-
 /** A template for companion objects of Seq and subclasses thereof.
  *
  *  @since 2.8
diff --git a/test/files/run/t4709.scala b/test/files/run/t4709.scala
new file mode 100644
index 0000000000..c61a440397
--- /dev/null
+++ b/test/files/run/t4709.scala
@@ -0,0 +1,10 @@
+
+
+import collection.GenSeq
+
+
+object Test {
+  def main(args: Array[String]) {
+    val Seq(1, 2) = Stream(1, 2)
+  }
+}