this derivation will be built:
  /nix/store/gkdmhdpa449d9abblzq2382m2rdgipg3-devshell.drv
this path will be fetched (0.0 KiB download, 29.9 KiB unpacked):
  /nix/store/v1491r5q0pdjc71rrq89giz0b73s32zi-devshell-dir