I am using bunch Rust tools, and now I've lost track which are supposed to be installed through rustup component add and which through cargo install -f, and which have -preview and which don't.
racer
rls
clippy
rustfmt
I want to use latest stable with Rust 2018 edition with these, if it makes any difference.
After more investigation, turns out I had still old (0.13) rustup, provided by my system (NixOS), and it was not seeing the new components. I had to manually switch to (still in git nixpkgs) rustup 0.15, then reinstall toolchains, and now everything is without -preview.