Merge pull request #3644 from retronym/ticket/8431

SI-8428 Fix regression in iterator concatenation

1 files changed, 12 insertions, 0 deletions

diff --git a/test/files/run/t8428.scala b/test/files/run/t8428.scala
new file mode 100644
index 0000000000..7da1207b7b
--- /dev/null
+++ b/test/files/run/t8428.scala
@@ -0,0 +1,12 @@
+object Test extends App {
+  val xs = List.tabulate(4)(List(_))
+  val i = xs.map(_.iterator).reduce { (a,b) =>
+    a.hasNext
+    a ++ b
+  }
+
+  val r1 = i.toList
+  val r2 = xs.flatten.toList
+
+  assert(r1 == r2, r1)
+}