these 4 derivations will be built:
  /nix/store/psyff3azffag4y4dn6yf3qx2v7zf2277-iets-0.1.0.drv
  /nix/store/s0b7fvb1v3xvwi0qd8nykqwrg0aar9iz-iets-fuzz-diff-0.0.0.drv
  /nix/store/an1cfdijxss4hpb92y75kdnr3cnmkyk3-iets-conformance-adapter.drv
  /nix/store/y514z6csl9f4hz1z9bql7sjnk6w7h406-nix-conformance-iets.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy