As a sidenote, I've been thinking about instituting an internal styling guide to discourage `unwrap()` in your scenario, in favor of `expect("impossibly missing")` or etc.

The message helps a bit more, and I also want to avoid debug unwraps that were forgotten about.

Though, the more I think about it the more a macro makes sense to me, purely for code search. If we used a macro, something like `impossible!(streams.pop())` then I can code search for `.unwrap` and `.expect`.

Hmm