[jsf666]

> It replaces approximately 160,000 lines of C++ with 85,000 lines of Rust

Wow! This is great, especially considering how bad and complex (in the bad sense) C++ is. Maybe Rust and Go will finally make the Frankenstein go to sleep

[zellyn]

Is this reduction in line count typical? I'm surprised. Or is this discounting parts of the code that have been moved out into separate crates?

[Rusky]

There's some good discussion of how it happened here: https://www.reddit.com/r/rust/comments/7cwpbq/fearless_concu...

One of the biggest contributors is "custom derive," which cuts out a lot of boilerplate. Another is that Gecko C++ is also pretty old and so doesn't rely on a lot of what is now standard. It's also just a ground-up rewrite, which has the advantage of hindsight.

It's not a trick of moving code around.

[zellyn]

Oh, thanks. Perfect link. It makes sense that rewrites are smaller, but the reduction factor was still surprising.