this derivation will be built:
  /nix/store/n5jdaipy5zx786jvrcnyb8g6d0ziywxq-inputDerivation-effect-docs-pages.drv
building '/nix/store/n5jdaipy5zx786jvrcnyb8g6d0ziywxq-inputDerivation-effect-docs-pages.drv'...