warning: unknown setting 'eval-cores'
warning: unknown setting 'lazy-trees'
this derivation will be built:
  /nix/store/7mkhkkf87h6cqp44463mzpwiy6y002px-formatting.drv
building '/nix/store/7mkhkkf87h6cqp44463mzpwiy6y002px-formatting.drv'