MemoryListener = object
  address: string
  accept: Future[Connection]
  onListenerEnd: proc (address: string) {.closure, ...gcsafe, raises: [].}

MemoryTransportAcceptStopped = object of MemoryTransportError

MemoryTransportError = object of transport.TransportError

proc accept(self: memoryConnManager; address: string): MemoryListener {.
    ...raises: [MemoryTransportError], tags: [RootEffect].}

proc accept(self: MemoryListener): Future[Connection] {....gcsafe,
    raises: [CatchableError], tags: [].}

proc close(self: MemoryListener) {....raises: [], tags: [RootEffect].}

proc dial(self: memoryConnManager; address: string): MemoryListener {.
    ...raises: [MemoryTransportError], tags: [].}

proc dial(self: MemoryListener): Future[Connection] {....gcsafe,
    raises: [CatchableError], tags: [TimeEffect, RootEffect].}

proc getInstance(): memoryConnManager {....gcsafe, raises: [], tags: [].}