From 0fdac3830746eb4aab7245411c1d581f84de7922 Mon Sep 17 00:00:00 2001
From: Nikolay Kim <fafhrd91@gmail.com>
Date: Tue, 12 Mar 2019 16:48:29 -0700
Subject: [PATCH] add constraint

---
 actix-server/src/builder.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/actix-server/src/builder.rs b/actix-server/src/builder.rs
index 99f2754f..6fa2e9ce 100644
--- a/actix-server/src/builder.rs
+++ b/actix-server/src/builder.rs
@@ -2,6 +2,7 @@ use std::time::Duration;
 use std::{io, mem, net};
 
 use actix_rt::{spawn, Arbiter, System};
+use actix_service::NewService;
 use futures::future::{lazy, ok};
 use futures::stream::futures_unordered;
 use futures::sync::mpsc::{unbounded, UnboundedReceiver};
@@ -9,6 +10,7 @@ use futures::{Async, Future, Poll, Stream};
 use log::{error, info};
 use net2::TcpBuilder;
 use num_cpus;
+use tokio_tcp::TcpStream;
 use tokio_timer::sleep;
 
 use crate::accept::{AcceptLoop, AcceptNotify, Command};
@@ -17,7 +19,7 @@ use crate::service_config::{ConfiguredService, ServiceConfig};
 use crate::services::{InternalServiceFactory, ServiceFactory, StreamNewService};
 use crate::signals::{Signal, Signals};
 use crate::worker::{self, Worker, WorkerAvailability, WorkerClient};
-use crate::{ssl, Token};
+use crate::{ssl, Io, ServerConfig, Token};
 
 /// Server builder
 pub struct ServerBuilder {
@@ -164,6 +166,7 @@ impl ServerBuilder {
     pub fn bind<F, U, N: AsRef<str>>(mut self, name: N, addr: U, factory: F) -> io::Result<Self>
     where
         F: ServiceFactory,
+        F::NewService: NewService<ServerConfig, Request = Io<TcpStream>>,
         U: net::ToSocketAddrs,
     {
         let sockets = bind_addr(addr, self.backlog)?;