these 2 derivations will be built:
  /nix/store/ab14g2fj7pbigg8b3sfa14262zr4wj0p-closure-info.drv
  /nix/store/rvk0z2j76h8k0csfxfdpwgh007sdwcn7-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy