From 4019f86c990d9f60ace7c233471e781fd3108db5 Mon Sep 17 00:00:00 2001
From: Olivier Blanvillain <olivier.blanvillain@gmail.com>
Date: Fri, 7 May 2021 16:46:14 +0200
Subject: [PATCH] Fix #9849: Add regression test

---
 tests/pos-deep-subtype/9849.scala | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 tests/pos-deep-subtype/9849.scala

diff --git a/tests/pos-deep-subtype/9849.scala b/tests/pos-deep-subtype/9849.scala
new file mode 100644
index 000000000000..45f7288b8956
--- /dev/null
+++ b/tests/pos-deep-subtype/9849.scala
@@ -0,0 +1,4 @@
+type *:[A, B] = A match
+  case (B *: x) => A
+  case (x *: y) => x *: (B *: y)
+  case _ => A *: B