}
      future.addListener(() -> provideValueAndCloser(consumer, this), executor);
    }

    @SuppressWarnings("Interruption") // We are propagating an interrupt from a caller.
    boolean cancel(boolean mayInterruptIfRunning) {
      logger.get().log(FINER, "cancelling {0}", closingFutureToString());
      boolean cancelled = future.cancel(mayInterruptIfRunning);
      if (cancelled) {

      client
        .newBuilder()
        .sslSocketFactory(handshakeCertificates.sslSocketFactory())
    }
  }

  /** Confirm that runtime exceptions thrown inside of OkHttp propagate to the caller.  */
  @Test
  fun unexpectedExceptionSync() {
    client =
      client
        .newBuilder()
        .dns { hostname: String? -> throw RuntimeException("boom!") }
        .build()