Fixes asynchttpsever.

lib/pure/asynchttpserver.nim

@@ -147,7 +147,7 @@ proc sendStatus(client: AsyncSocket, status: string): Future[void] =
 proc processClient(client: AsyncSocket, address: string,
                    callback: proc (request: Request):
                       Future[void] {.closure, gcsafe.}) {.async.} =
-  while not client.closed:
+  while not client.isClosed:
     # GET /path HTTP/1.1
     # Header: val
     # \n

lib/pure/asyncnet.nim

@@ -454,6 +454,10 @@ proc getFd*(socket: AsyncSocket): SocketHandle =
   ## Returns the socket's file descriptor.
   return socket.fd
 
+proc isClosed*(socket: AsyncSocket): bool =
+  ## Determines whether the socket has been closed.
+  return socket.closed
+
 when isMainModule:
   type
     TestCases = enum