Implement basic lua test harness

src/main.rs

@@ -219,17 +219,14 @@ fn init_tokio(args: &Args) -> tokio::runtime::Runtime {
 fn init_lua(args: &Args) -> lb::runtime::Runtime {
     let mut rt = {
         let mut rt = lb::runtime::Builder::new();
-        rt.unhandled_error(error_cb);
         luby::open(&mut rt);
 
         if args.dump.iter().find(|s| *s == "cdef").is_some() {
-            print!("{}", rt.registry()); // for debugging
+            print!("{}", rt.registry()); // for cdef debugging
         }
 
-        rt
-    }
-    .build()
-    .unwrap();
+        rt.unhandled_error(error_cb).build().unwrap()
+    };
 
     for arg in args.jit.iter() {
         let mut s = rt.guard();
@@ -281,10 +278,10 @@ async fn main_async(args: Args, cx: &mut lb::runtime::Context) -> Result<(), Exi
             }
         };
 
-        if let Err(err) = cx.load(&luajit::Chunk::new(chunk).path(path)) {
-            cx.report_error(&err);
-        } else if let Err(err) = cx.call_async(0, 0).await {
-            cx.report_error(&err);
+        if let Err(ref err) = cx.load(&luajit::Chunk::new(chunk).path(path)) {
+            cx.report_error(err);
+        } else if let Err(ref err) = cx.call_async(0, 0).await {
+            cx.report_error(err);
         }
     }