these 2 derivations will be built:
  /nix/store/vangd9il7d2p55awnb9l3m7b2dqbpxs4-closure-info.drv
  /nix/store/ajdr241hbj6yd77jvsy3airhsmz92kcj-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy