this derivation will be built:
  /nix/store/9vkr5xi3rdknlxddqgfvsvs9d6im0zzx-inputDerivation-effect-docs-pages.drv
building '/nix/store/9vkr5xi3rdknlxddqgfvsvs9d6im0zzx-inputDerivation-effect-docs-pages.drv'...