(fix) Fix an overflow in evaluating trait bounds.

See: rust-lang/rust#22655

Fixes iron#71

Author: reem

examples/simple.rs

@@ -13,7 +13,7 @@ fn main() {
     router.get("/", handler);
     router.get("/:query", handler);
 
-    Iron::new(router).listen("localhost:3000").unwrap();
+    Iron::new(handler).http("localhost:3000").unwrap();
 
     fn handler(req: &mut Request) -> IronResult<Response> {
         let ref query = req.extensions.get::<Router>()

src/router.rs

@@ -18,6 +18,9 @@ pub struct Router {
     routers: HashMap<method::Method, Recognizer<Box<Handler>>>
 }
 
+unsafe impl Send for Router {}
+unsafe impl Sync for Router {}
+
 impl Router {
     /// Construct a new, empty `Router`.
     ///