Writing in Rust gives me such https://xkcd.com/1425/ vibes.
🧠 Rewrite the application's entire cryptographic and network protocol, with no major bugs once it compiles...
⚙️ Sure, gimme a few hours.
🧠 ...and update the tests to concatenate some byte arrays inline.
⚙️ I'll need a research team and five years.
(Yeah, it's kind of like this in every programming language sometimes. Just finding Rust to be... more so.)
The answer turned out to be to write something like the below -- casting the first element to an unsized thing so that the compiler didn't get hung up on sizes not matching.
```
[b"..." as &[u8], b"more stuff"].concat()
```
