crate

They shook the head of the unconscious pilot and when the latter opened his eyes, blinking wildly, the other members of the family lifted up the tail of the overturned crate sufficiently high enough to enable the dazed pilot, after releasing his belt, to fall out of the cockpit head first and disengage himself from the crack-up.

And Rust never compiles modules separately, even if they're in separate files: when you build a Rust crate, you're recompiling all of its modules.