this derivation will be built:
  /nix/store/gwxjjc7kllg8960vc03wkxjjcprgcjx1-inputDerivation-effect-docs-pages.drv
building '/nix/store/gwxjjc7kllg8960vc03wkxjjcprgcjx1-inputDerivation-effect-docs-pages.drv'...