Iteration bug in TrieIterator.

1 files changed, 21 insertions, 0 deletions

diff --git a/test/files/run/bug3984.scala b/test/files/run/bug3984.scala
new file mode 100644
index 0000000000..3e4d2edf53
--- /dev/null
+++ b/test/files/run/bug3984.scala
@@ -0,0 +1,21 @@
+object Test {
+  import scala.collection.immutable.{ Set => ImmutSet }
+  import scala.collection.mutable.{ Set => MutSet }
+
+  case class IH (i: Int, h: Int) {
+    override def hashCode: Int = h
+  }
+
+  def main (args: Array[String]) {
+    var is = ImmutSet.empty[IH]
+    var ms = MutSet.empty[IH]
+    for (ih <- List(IH(2,0),IH(0,0),IH(4,4),IH(6,4),IH(-8,1520786080))) {
+      is = is + ih
+      ms = ms + ih
+    }
+    val x = IH(6,4)
+    is = is - x
+    ms = ms - x
+    assert(is == ms)
+  }
+}