nix mold example, just run `nix develop`

flake.nix

{
  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    rust-evdev = {
      url = "github:ndesh26/evdev-rs";
      flake = false;
    };
  };
  outputs = { self, nixpkgs, flake-utils, rust-evdev }:
    flake-utils.lib.eachDefaultSystem (system:
      let pkgs = nixpkgs.legacyPackages.${system}; in
      rec {
        devShell = pkgs.mkShell {
          shellHook = ''
            set -x
            echo "Setting RUSTFLAGS so we use clang with mold as linker"
            export RUSTFLAGS="-C linker=clang -Clink-arg=-fuse-ld=$(which mold)"

            echo "Creating and changing into temporary directory"
            cd $(mktemp -d)

            echo "Copying the sources of rust-evdev here."
            cp -r ${rust-evdev} .
            chmod -R +w *

            echo "Building evtest"
            cd *
            cargo build --example evtest

            echo "Running evtest"
            cargo run --example evtest

          '';
          packages = [
            pkgs.mold
            pkgs.pkgconfig
            pkgs.libevdev
            pkgs.clang
            pkgs.coreutils
            pkgs.cargo
            pkgs.rustc
          ];
        };
      });
}