these 2 derivations will be built:
  /nix/store/rng2w5mfp7crzrbsfhz2v5zdz15c5h03-closure-info.drv
  /nix/store/6zag2clifvgrswh2dsq2dvx8vqaa9ahq-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy