these 2 derivations will be built:
  /nix/store/wbhcvssyxd0gxj98s9l10ks3y22vkgal-devshell-dir.drv
  /nix/store/j7czcjdssbgv7200cx1kzv74ccikpig0-devshell.drv
these 4 paths will be fetched (3.1 KiB download, 15.5 KiB unpacked):
  /nix/store/b1lyn1hdqrr25d58chjxnbxsrvv64js7-builder.pl
  /nix/store/2im005i31p6ihr8xwxvmpln7id024r96-devshell-entrypoint
  /nix/store/pdf1bkhs6hzfi9qhd17bjsvqj3iald4k-devshell-env.bash
  /nix/store/81spysdciabm21937nl7yc1h8kr84wyy-naked-stdenv