Configuring this with Clion

[KaiserKarel]

I'm a bit of a nix noob. This is my shell config

let
  oxalica_overlay = import (builtins.fetchTarball
    "https://github.com/oxalica/rust-overlay/archive/master.tar.gz");
  nixpkgs = import <nixpkgs> { overlays = [ oxalica_overlay ]; };

in with nixpkgs;
pkgs.mkShell {
    # nativeBuildInputs is usually what you want -- plugins you need to run
    nativeBuildInputs = [
        firefox
	jetbrains.clion
        docker
        docker-compose
        openssl.dev
        gcc

        protobuf
	buf
        rustPackages.clippy
        pkg-config
    ];
}

Clion is unable to find the rust toolchain location and stdlib. If I add rustup to buildinputs, it's fine. Does adding rustup conflict with the overlay?