this derivation will be built:
  /nix/store/0njy0x9gpvrffsmwcg6h9hydb8w1bmlh-inputDerivation-effect-docs-pages.drv
building '/nix/store/0njy0x9gpvrffsmwcg6h9hydb8w1bmlh-inputDerivation-effect-docs-pages.drv'...