Fixes and closes #4461. No review.

1 files changed, 19 insertions, 0 deletions

diff --git a/test/files/run/t4461.scala b/test/files/run/t4461.scala
new file mode 100644
index 0000000000..d1f80a6012
--- /dev/null
+++ b/test/files/run/t4461.scala
@@ -0,0 +1,19 @@
+import scala.collection.mutable._
+import scala.collection.script._
+
+
+// #4461
+object Test {
+  def main(args: Array[String]) {
+    val buf = new ArrayBuffer[Int] with ObservableBuffer[Int]
+    buf.subscribe(new Subscriber[Message[Int], ObservableBuffer[Int]] {
+      def notify(pub: ObservableBuffer[Int], event: Message[Int]) = println(event)
+    })
+
+    buf += 1 // works
+    buf ++= Array(2) // works
+    buf ++= ArrayBuffer(3, 4) // works
+    buf ++= List(5) // works
+    buf ++= collection.immutable.Vector(6, 7) // works
+  }
+}