this derivation will be built:
  /nix/store/bgin7h6gjq0y40ddch9vi8f6hwvvjnpd-inputDerivation-effect-docs-pages.drv
building '/nix/store/bgin7h6gjq0y40ddch9vi8f6hwvvjnpd-inputDerivation-effect-docs-pages.drv'...