this derivation will be built:
  /nix/store/n8gahanl3gfk4wn8snm5djw9c3mkfgvy-inputDerivation-effect-docs-pages.drv
building '/nix/store/n8gahanl3gfk4wn8snm5djw9c3mkfgvy-inputDerivation-effect-docs-pages.drv'...