The failure I got from the Rust Analyzer:
error[E0554]: `#![feature]` may not be used on the stable release channel
--> src/lib.rs:1:12
|
1 | #![feature(iter_intersperse)]
| ^^^^^^^^^^^^^^^^
It’s inconsistent with the test runner - my solution passes the test suite 
My real issue is that since this feedback is hanging on my iteration, preventing the protein-based reviewer to come by, since they see automated feedback attached to my solution.