this derivation will be built:
  /nix/store/4h8r1qfs4cwv4l0lixq94pxqr3ps3fxd-inputDerivation-effect-docs-pages.drv
building '/nix/store/4h8r1qfs4cwv4l0lixq94pxqr3ps3fxd-inputDerivation-effect-docs-pages.drv'...