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Fuchsia has a lot of Rust code. (Disclosure: I write Rust code for Fuchsia on a daily basis.)

CLOC says about ~1 MLOC of Rust and ~1.1 MLOC of C++ in https://fuchsia.googlesource.com/fuchsia/+/refs/heads/main/s...

I'd still call this a success for rust in the wild, if a huge entrenched company like Google would include it so much for a big OS play, even if it shares that room with more established languages.

There are many ways to cut metrics, but here's some line counts:

C 365017 C Header 894250 CMake 396 C++ 2025857 C++ Header 10691 Rust 3124869

Being these two the most important functions [1], [2].

The rest is merely overhead :)

[1] https://fuchsia.googlesource.com/fuchsia/+/refs/heads/main/z...

[2] https://fuchsia.googlesource.com/fuchsia/+/refs/heads/main/z...