onactivate =}
    thenfunction (
      return clients.laim(;
    match_count_before: -1,
    match_count_after: -1,
    message: "claim_worker_1",
  };

  self.clients
    .matchAll()
    .then(function (matched) {
      // should be 0
      result.match_count_before = matched.length;
    })
    .then(function () {
      return self.clients.claim();
    })
    .then(function (ret) {
      result.resolve_value = ret;
      return self.clients.matchAll();
    })
    .then(function (matched) {
      // should be 2
      result.match_count_after = matched.length;
      for (i = 0; i < matched.length; i++) {
        matched[i].postMessage(result);
      }
      if (result.match_count_after !== 2) {
R:claim_worker_1 failed to capture clients.)java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
      java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 7
    });
};