these 4 derivations will be built:
  /nix/store/cvljhiidc4idzjwsiwvr3jjamridprky-iets-0.2.0.drv
  /nix/store/zd1a7cxnkaf41alb2mzvzq3dx54lmmdz-iets-fuzz-diff-0.0.0.drv
  /nix/store/pyckbg7p0x9s98jyk4q0ifs7n64mpmyi-iets-conformance-adapter.drv
  /nix/store/y4srppyflhpwayislq6ri8vq2qbwxk5x-nix-conformance-iets.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy