convert-to-import-cargo-lock: avoid top-level with in shell.nix

with import ../../../. { };

{

  pkgs ? import ../../.. { },

}:

let

  inherit (pkgs) lib stdenv mkShell;

in

mkShell {

  packages = [ rustc cargo clippy rustfmt ] ++ lib.optional stdenv.isDarwin libiconv;

  packages =

    with pkgs;

    [

      rustc

      cargo

      clippy

      rustfmt

    ]

    ++ lib.optional stdenv.isDarwin pkgs.libiconv;

}