Minor optimization of Rust Core library
While coding in Rust, I noticed how some of my function calls were behaving incorrectly: they don’t say they would panic in documentation, but the panicking code branch still generates. After knowing that, and digging through the source code (which was, btw, a breeze, thanks Core devs), I figured out the problem, forked Rust and sent a pull request.
Now I became a proud Rust contributor, and we can write a slightly more efficient software with less unnecessary branches.