this derivation will be built:
  /nix/store/bcdhx0c1i1nmi46a0qspizjdza6j3ygh-ats-acc-unstable-2018-10-21.drv
this path will be fetched (1.1 MiB download, 9.2 MiB unpacked):
  /nix/store/jv33jhb69cr5rzciibm4v4i9hn3paihj-ats2-0.4.2