$ nix-shell ... ... Using rust registry from /nix/store/q5ac2qj0ll147d9qpmj53q3wqpkm2rci-rustRegistry-2017-06-25-d48b245 ERROR: The Cargo.lock file doesn't exist Cargo.lock is needed to make sure that depsSha256 doesn't change when the registry is updated.
Nix Store store the archive of local file indefinitely and not trying to fetch the updated one.
Doing delete operation on Nix Store.
nix-store --delete /nix/store/aisrntierhashtofile-phraserox-cli.tar.gz