@Throws(IOException::class)
  internal fun checkOutNotClosed() {
    when {
      sink.closed -> throw IOException("stream closed")
      sink.finished -> throw IOException("stream finished")
      errorCode != null -> throw errorException ?: StreamResetException(errorCode!!)
    }
  }

  /**
   * Like [Object.wait], but throws an [InterruptedIOException] when interrupted instead of the more
   * awkward [InterruptedException].