this derivation will be built:
  /nix/store/ya3jyxxqsymdkim1ny8iwn7a6v658iw9-inputDerivation-effect-docs-pages.drv
building '/nix/store/ya3jyxxqsymdkim1ny8iwn7a6v658iw9-inputDerivation-effect-docs-pages.drv'...