add one more test for unapplySeq

Author: liufengyun

tests/patmat/i3004.scala

@@ -9,4 +9,4 @@ object O {
   }
 
   def m(c: C) = c match { case C(b) => b }
-}
+}

tests/patmat/t9232.check

@@ -1,2 +1,3 @@
 13: Pattern Match Exhaustivity: Node2()
 17: Pattern Match Exhaustivity: Node2(), Node1(Foo(Nil)), Node1(Foo(List(_, _*)))
+21: Pattern Match Exhaustivity: Node2(), Node1(Foo(Nil))

tests/patmat/t9232.scala

@@ -17,4 +17,8 @@ object Test {
   def transformTree2(tree: Tree): Any = tree match {
     case Node1(Foo(1, _: _*)) => ???
   }
+
+  def transformTree3(tree: Tree): Any = tree match {
+    case Node1(Foo(x, _: _*)) => ???
+  }
 }