Break codegen for 0-prio async

macros/src/codegen/idle.rs

@@ -67,15 +67,15 @@ pub fn codegen(
         (mod_app, root_idle, user_idle, call_idle)
     } else {
         // TODO: No idle defined, check for 0-priority tasks and generate an executor if needed
+        unimplemented!();
 
-        //
-        (
-            vec![],
-            vec![],
-            None,
-            quote!(loop {
-                rtic::export::nop()
-            }),
-        )
+        // (
+        //     vec![],
+        //     vec![],
+        //     None,
+        //     quote!(loop {
+        //         rtic::export::nop()
+        //     }),
+        // )
     }
 }