this derivation will be built:
  /nix/store/3am4y9drxpgrxfwkd2zmx9mkp25084km-check-zcode.drv
this path will be fetched (0.0 KiB download, 803.2 MiB unpacked):
  /nix/store/p93nqlz9srh34mbjfavrx375gnpby185-zcode-3.16.2