these 4 derivations will be built:
  /nix/store/idqgaf7hmvcd6csm6hzdp8la9ma5d650-crate-cc-1.11.1.tar.gz.drv
  /nix/store/nn4wj3550fbfq2sxdkhiyg7wmg0s09rq-cc-1.11.1.drv
  /nix/store/smhl0wnwbhbcssh624s9x25s2ik7xbrb-cargo-vendor-dir.drv
  /nix/store/1b4kazr655p58j56wnssw498zk1s8lqx-nix-ld.drv