1 files changed, 36 insertions, 0 deletions
diff --git a/test/files/run/t6150.scala b/test/files/run/t6150.scala
new file mode 100644
index 0000000000..f3e83e1549
--- /dev/null
+++ b/test/files/run/t6150.scala
@@ -0,0 +1,36 @@
+object Test {
+  import collection.{ immutable, mutable, generic }
+  def TheOneTrueCBF = collection.IndexedSeq.ReusableCBF
+
+  val cbf1 = implicitly[generic.CanBuildFrom[immutable.Vector[Int], Int, collection.IndexedSeq[Int]]]
+  val cbf2 = implicitly[generic.CanBuildFrom[immutable.IndexedSeq[Int], Int, collection.IndexedSeq[Int]]]
+  val cbf3 = implicitly[generic.CanBuildFrom[collection.IndexedSeq[Int], Int, collection.IndexedSeq[Int]]]
+
+  val cbf4 = implicitly[generic.CanBuildFrom[immutable.Vector[Int], Int, immutable.IndexedSeq[Int]]]
+  val cbf5 = implicitly[generic.CanBuildFrom[immutable.Vector[Int], Int, immutable.Vector[Int]]]
+  val cbf6 = implicitly[generic.CanBuildFrom[immutable.IndexedSeq[Int], Int, immutable.IndexedSeq[Int]]]
+
+  def check[C](v: C) = {
+    assert(v == Vector(1, 2, 3, 4))
+    assert(v.isInstanceOf[Vector[_]])
+  }
+  def checkRealMccoy(x: AnyRef) = {
+    assert(x eq TheOneTrueCBF, cbf1)
+  }
+
+  val v = immutable.Vector(1, 2, 3)
+  val iiv: immutable.IndexedSeq[Int] = immutable.Vector(1, 2, 3)
+  val iv: IndexedSeq[Int] = immutable.Vector(1, 2, 3)
+
+  def main(args: Array[String]): Unit = {
+    List(cbf1, cbf2, cbf3, cbf4, cbf5, cbf6) foreach checkRealMccoy
+    check(v.:+(4)(cbf1))
+    check(v.:+(4)(cbf2))
+    check(v.:+(4)(cbf3))
+
+    check(iiv.:+(4)(cbf2))
+    check(iiv.:+(4)(cbf3))
+
+    check(iv.:+(4)(cbf3))
+  }
+}