removed complexity (Send is an illusion)

loader/src/main.rs

@@ -11,12 +11,10 @@ async fn main() -> Result<()> {
     let (tx,rx) = oneshot::channel();
 
     let func: Symbol<unsafe extern fn(u64,u64, Receiver<u64>) -> Pin<Box<dyn Future<Output = u64> + Send>>> =  unsafe {lib.get(b"add_wrapper")?};
-    let func = unsafe{func.into_raw()};
+
     let  fut = unsafe{func(12,54, rx)};
 
-    let out = tokio::spawn(async move {
-        fut.await
-    });
+    let out = tokio::spawn(fut);
 
     tx.send(8).unwrap();
 

readme.md

@@ -0,0 +1,9 @@
+# async hot reloading
+
+minimal example of loading an async function from a `.so` and spawning it on the tokio executor. 
+
+the loaded library returns a 
+```rust
+Pin<Box<dyn Future<Output = u64> + Send >>
+```
+which can be sent directly to tokio