Merge pull request #638 from scala/backport-lts-3.3-23968

Backport "Fix false exhaustivity warning for seq match" to 3.3 LTS

Author: tgodzik

tests/pos/i23928.scala

@@ -0,0 +1,5 @@
+object Test {
+  Nil match {
+    case Seq(xs*) => 42
+  }
+}