AFAIK, in Void it's even recommended for users to use rustup to manage everything Rust they might need. Rust, Cargo and friends only get packaged themselves for the purposes of building distro packaged software written in Rust: alacritty, bottom, etc.

They don't package Rust crates for you to use them, so ABI doesn't matter of course. And yes, they don't do it like they do e.g. with Python modules — so yeah, Rust gets special treatment here.

CC: @newt@stereophonic.space