try {
                            collector.collectFrom(sourceFile).forEach { (version, incubating) ->
                                versionToIncubating.getOrPut(version) { mutableSetOf() }.addAll(incubating)
                            }
                        } catch (e: Exception) {
                            throw Exception("Unable to parse $sourceFile", e)
                        }

        }

        val superTypeStack = ArrayDeque<String>().apply {
            addSuperTypesOf(delegate)
        }

        val visited = mutableSetOf<String>()

        val matchesMethodNode = { candidate: MethodNode ->
            candidate.desc == methodNode.desc && candidate.signature == methodNode.signature
        }

  val writer = Http2Writer(socket.sink, client)

  // Visible for testing
  val readerRunnable = ReaderRunnable(Http2Reader(socket.source, client))

  // Guarded by this.
  private val currentPushRequests = mutableSetOf<Int>()

  init {
    if (builder.pingIntervalMillis != 0) {
      val pingIntervalNanos = TimeUnit.MILLISECONDS.toNanos(builder.pingIntervalMillis.toLong())