In that exercise Rust is compared with C from zero cost C ABI point of view. Rust could replace C for shared libraries. Other languages could work with Rust cdy

In that exercise Rust is compared with C from zero cost C ABI point of view. Rust could replace C for shared libraries. Other languages could work with Rust cdylibs as if those libs were written in C. But as the language, Rust features such as safety are good. I did not intend to compare the languages, but the use case of shared libs with C ABI. Also the title has "as", not "is", and that word choice is very intentional and not accidental.