3 files changed, 48 insertions, 0 deletions
diff --git a/test/files/neg/t7020.check b/test/files/neg/t7020.check
new file mode 100644
index 0000000000..a869b12363
--- /dev/null
+++ b/test/files/neg/t7020.check
@@ -0,0 +1,17 @@
+t7020.scala:3: error: match may not be exhaustive.
+It would fail on the following inputs: List((x: Int forSome x not in (1, 2, 4, 5, 6, 7))), List(_, _)
+  List(5) match {
+      ^
+t7020.scala:10: error: match may not be exhaustive.
+It would fail on the following inputs: List((x: Int forSome x not in (1, 2, 4, 5, 6, 7))), List(_, _)
+  List(5) match {
+      ^
+t7020.scala:17: error: match may not be exhaustive.
+It would fail on the following inputs: List((x: Int forSome x not in (1, 2, 4, 5, 6, 7))), List(_, _)
+  List(5) match {
+      ^
+t7020.scala:24: error: match may not be exhaustive.
+It would fail on the following inputs: List((x: Int forSome x not in (1, 2, 4, 5, 6, 7))), List(_, _)
+  List(5) match {
+      ^
+four errors found
diff --git a/test/files/neg/t7020.flags b/test/files/neg/t7020.flags
new file mode 100644
index 0000000000..e8fb65d50c
--- /dev/null
+++ b/test/files/neg/t7020.flags
@@ -0,0 +1 @@
+-Xfatal-warnings
+\ No newline at end of file
diff --git a/test/files/neg/t7020.scala b/test/files/neg/t7020.scala
new file mode 100644
index 0000000000..cc5421bab1
--- /dev/null
+++ b/test/files/neg/t7020.scala
@@ -0,0 +1,30 @@
+object Test {
+  // warning was non-deterministic
+  List(5) match {
+    case 1 :: Nil | 2 :: Nil  =>
+    case (x@(4 | 5 | 6)) :: Nil =>
+    case 7 :: Nil  =>
+    case Nil =>
+  }
+
+  List(5) match {
+    case 1 :: Nil | 2 :: Nil  =>
+    case (x@(4 | 5 | 6)) :: Nil =>
+    case 7 :: Nil  =>
+    case Nil =>
+  }
+
+  List(5) match {
+    case 1 :: Nil | 2 :: Nil  =>
+    case (x@(4 | 5 | 6)) :: Nil =>
+    case 7 :: Nil  =>
+    case Nil =>
+  }
+
+  List(5) match {
+    case 1 :: Nil | 2 :: Nil  =>
+    case (x@(4 | 5 | 6)) :: Nil =>
+    case 7 :: Nil  =>
+    case Nil =>
+  }
+}