test/jdk/java/util/concurrent/StructuredTaskScope/StressCancellation.java

@@ -65,11 +65,11 @@
      @ParameterizedTest
      @MethodSource("testCases")
      void test(ThreadFactory factory, int beforeCancel, int afterCancel) throws Exception {
          var joiner = new Joiner<Boolean, Void>() {
              @Override
-             public boolean onComplete(Subtask<? extends Boolean> subtask) {
+             public boolean onComplete(Subtask<Boolean> subtask) {
                  boolean cancel = subtask.get();
                  return cancel;
              }
              @Override
              public Void result() {