diff --git a/src/lib/comm.rs b/src/lib/comm.rs
index dfd8587e36b..07097079c0e 100644
--- a/src/lib/comm.rs
+++ b/src/lib/comm.rs
@@ -8,17 +8,18 @@ export recv;
 export chan;
 export port;
 
-native "rust" mod rustrt {
+native "c-stack-cdecl" mod rustrt {
     type void;
     type rust_port;
 
-    fn chan_id_send<~T>(target_task: task::task, target_port: port_id,
+    fn chan_id_send<~T>(unused_task: *void, t: *sys::type_desc,
+                        target_task: task::task, target_port: port_id,
                         -data: T);
 
-    fn new_port(unit_sz: uint) -> *rust_port;
-    fn del_port(po: *rust_port);
-    fn drop_port(po: *rust_port);
-    fn get_port_id(po: *rust_port) -> port_id;
+    fn new_port(unused_task: *void, unit_sz: uint) -> *rust_port;
+    fn del_port(unused_task: *void, po: *rust_port);
+    fn drop_port(unused_task: *void, po: *rust_port);
+    fn get_port_id(unused_task: *void, po: *rust_port) -> port_id;
 }
 
 native "rust-intrinsic" mod rusti {
@@ -32,23 +33,28 @@ type port_id = int;
 tag chan<~T> { chan_t(task::task, port_id); }
 
 resource port_ptr(po: *rustrt::rust_port) {
-    rustrt::drop_port(po);
-    rustrt::del_port(po);
+    rustrt::drop_port(ptr::null(), po);
+    rustrt::del_port(ptr::null(), po);
 }
 
 tag port<~T> { port_t(@port_ptr); }
 
 fn send<~T>(ch: chan<T>, -data: T) {
     let chan_t(t, p) = ch;
-    rustrt::chan_id_send(t, p, data);
+    rustrt::chan_id_send(ptr::null(), sys::get_type_desc::<T>(), t, p, data);
+    task::yield();
 }
 
 fn port<~T>() -> port<T> {
-    port_t(@port_ptr(rustrt::new_port(sys::size_of::<T>())))
+    let p = rustrt::new_port(ptr::null(), sys::size_of::<T>());
+    ret port_t(@port_ptr(p));
 }
 
-fn recv<~T>(p: port<T>) -> T { ret rusti::recv(***p) }
+fn recv<~T>(p: port<T>) -> T {
+    ret rusti::recv(***p);
+}
 
 fn chan<~T>(p: port<T>) -> chan<T> {
-    chan_t(task::get_task_id(), rustrt::get_port_id(***p))
+    let id = rustrt::get_port_id(ptr::null(), ***p);
+    ret chan_t(task::get_task_id(), id);
 }
diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index 32eb4a685d7..310d61b182e 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -576,7 +576,6 @@ chan_id_send(type_desc *t, rust_task_id target_task_id,
             port->remote_chan->send(sptr);
         }
         target_task->deref();
-        task->yield();
     }
 }
 
diff --git a/src/test/stdtest/comm.rs b/src/test/stdtest/comm.rs
index 9c31c5e6f72..bef5a3c4e5b 100644
--- a/src/test/stdtest/comm.rs
+++ b/src/test/stdtest/comm.rs
@@ -4,6 +4,13 @@ import std::comm;
 #[test]
 fn create_port_and_chan() { let p = comm::port::<int>(); comm::chan(p); }
 
+#[test]
+fn send_int() {
+    let p = comm::port::<int>();
+    let c = comm::chan(p);
+    comm::send(c, 22);
+}
+
 #[test]
 fn send_recv_fn() {
     let p = comm::port::<int>();
@@ -21,9 +28,17 @@ fn send_recv_fn_infer() {
 }
 
 #[test]
-fn chan_chan() {
+fn chan_chan_infer() {
     let p = comm::port(), p2 = comm::port::<int>();
     let c = comm::chan(p);
     comm::send(c, comm::chan(p2));
     comm::recv(p);
 }
+
+#[test]
+fn chan_chan() {
+    let p = comm::port::<comm::chan<int>>(), p2 = comm::port::<int>();
+    let c = comm::chan(p);
+    comm::send(c, comm::chan(p2));
+    comm::recv(p);
+}