The "C ABI" is really "the platform ABI", because most OS are interacted with through libc (or equivalent). Though that should not apply to Rust at all, as it

The "C ABI" is really "the platform ABI", because most OS are interacted with through libc (or equivalent). Though that should not apply to Rust at all, as it does not pledge to follow the C ABI internally (aka `extern "Rust"`).