Rust interfaces very well with C. When you have a large C codebase it's easy to one day just stop writing any more C, and write all new code in Rust without ski

Rust interfaces very well with C. When you have a large C codebase it's easy to one day just stop writing any more C, and write all new code in Rust without skipping a beat. There are successful examples of this like librsvg. OTOH interfacing with C++ is very hard. D might be the only language that has seriously tried it, but from Rust's perspective C++ has largely overlapping, but incompatible set of features, and it's a weird dead-end.