warning: unknown setting 'eval-cores'
warning: unknown setting 'lazy-trees'
this derivation will be built:
  /nix/store/a0lsh27nd31plm9lgsxrd4cksjh0kdc1-formatting.drv
building '/nix/store/a0lsh27nd31plm9lgsxrd4cksjh0kdc1-formatting.drv'