fix(server): allow Server::local_addr to be called with custom exec…

…utor (#2009)

add generic for the executor to server impl block

resolves #1988

examples/single_threaded.rs

@@ -37,14 +37,15 @@ fn main() {
 
     let server = Server::bind(&addr)
         .executor(exec)
-        .serve(new_service)
-        .map_err(|e| eprintln!("server error: {}", e));
+        .serve(new_service);
 
     println!("Listening on http://{}", addr);
 
+    assert_eq!(addr, server.local_addr());
+
     current_thread::Runtime::new()
         .expect("rt new")
-        .spawn(server)
+        .spawn(server.map_err(|e| eprintln!("server error: {}", e)))
         .run()
         .expect("rt run");
 }

src/server/mod.rs

@@ -133,7 +133,7 @@ impl Server<AddrIncoming, ()> {
 }
 
 #[cfg(feature = "runtime")]
-impl<S> Server<AddrIncoming, S> {
+impl<S, E> Server<AddrIncoming, S, E> {
     /// Returns the local address that this server is bound to.
     pub fn local_addr(&self) -> SocketAddr {
         self.spawn_all.local_addr()