this derivation will be built:
  /nix/store/p17ai1bvgrag0vrbp0nqkj9n5pcrdan1-shell-completion-test.drv
these 2 paths will be fetched (12.1 MiB download, 42.9 MiB unpacked):
  /nix/store/qvkp3a6km0y8grmh47jqv2cxh8mzb6nz-fish-4.9.3
  /nix/store/6fqfyf4gm3gmq0nqcay90pm4xx5qn6w2-fish-4.9.3-doc