Merge pull request #11531 from griggt/fix-#10667

Fix #10667: Add regression test

Author: liufengyun

tests/pos/i10667.scala

@@ -0,0 +1,15 @@
+sealed trait A
+
+enum Nums {
+  case One
+  case Two extends Nums with A
+  case Three
+}
+
+object Test {
+  val list = List[Nums & A](Nums.Two)
+
+  list.map {
+    case Nums.Two => ()
+  }
+}