Rust’s Latest Release Just Cleaned Up Your Cargo Cache Automatically!

— And It Might Save You More Than Just Disk Space

The Day My Disk Space Hit Zero

It happened in the middle of a build.
I was working on a large Rust microservice, juggling multiple feature branches. cargo build was running for the 50th time that week, when my terminal politely stopped to tell me:

error: failed to write file: No space left on device

No space left. On a 512GB SSD.
I opened up my storage analyzer, and there it was — a monster eating away my disk like a rusted-out hard drive: ~/.cargo/.

It wasn’t one crate, not even ten.
It was hundreds of megabytes of old build artifacts, outdated dependencies, and cache leftovers from projects I’d abandoned months ago. And I’d never cleaned them up — because I didn’t even know how bad it was.

Then Rust 1.88 dropped… and changed everything.

The New Cache Cleanup Feature

Starting with Rust 1.88, Cargo has an automatic garbage collection system for its cache.
This means you no longer have to manually run cargo cache -r or delete ~/.cargo/registry yourself…