this derivation will be built:
  /nix/store/c12f1wj3xfnx6r3w84i7vc02cr7kfgmb-inputDerivation-effect-docs-pages.drv
building '/nix/store/c12f1wj3xfnx6r3w84i7vc02cr7kfgmb-inputDerivation-effect-docs-pages.drv'...