this derivation will be built:
  /nix/store/mz3v3fkhm9ny5sm432vmy1w5r85l9w5h-nix-shell.drv
these 2 paths will be fetched (80.3 MiB download, 257.6 MiB unpacked):
  /nix/store/2dp0s3202a3j3h1jnr4kkp8qc22knhqi-delve-1.27.1
  /nix/store/8wqi4fqjnjaz6ln5wc8m5sdsh3r6fx4j-rustfs-1.0.0-beta.12