1 files changed, 12 insertions, 0 deletions
diff --git a/tests/run/t8428.scala b/tests/run/t8428.scala
new file mode 100644
index 000000000..d79a698d4
--- /dev/null
+++ b/tests/run/t8428.scala
@@ -0,0 +1,12 @@
+object Test extends dotty.runtime.LegacyApp {
+  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)
+}