this derivation will be built:
  /nix/store/3vgkkadl10ialifdnkn29z31wa1p6qnn-nix-shell.drv
these 2 paths will be fetched (3.4 MiB download, 10.5 MiB unpacked):
  /nix/store/w5wavxwf7xvwkcmga7c7yzw7mnav20mi-cargo-criterion-1.1.0
  /nix/store/7xm065h74miairaqy2v70z4p6qzblc7g-cargo-insta-1.48.0