1 files changed, 27 insertions, 0 deletions
diff --git a/test/files/run/t4894.scala b/test/files/run/t4894.scala
new file mode 100644
index 0000000000..2b70da141d
--- /dev/null
+++ b/test/files/run/t4894.scala
@@ -0,0 +1,27 @@
+
+
+
+
+
+object Test {
+
+  def main(args: Array[String]) {
+    import collection._
+    val hs = mutable.HashSet[Int]()
+    hs ++= 1 to 10
+    hs --= 1 to 10
+
+    val phs = parallel.mutable.ParHashSet[Int]()
+    phs ++= 1 to 10
+    for (i <- 1 to 10) assert(phs(i))
+    phs --= 1 to 10
+    assert(phs.isEmpty)
+
+    val phm = parallel.mutable.ParHashMap[Int, Int]()
+    phm ++= ((1 to 10) zip (1 to 10))
+    for (i <- 1 to 10) assert(phm(i) == i)
+    phm --= 1 to 10
+    assert(phm.isEmpty)
+  }
+
+}