this derivation will be built:
  /nix/store/wgz86ibjy7kqkim5x7j3ypbsqajg0fgd-inputDerivation-effect-docs-pages.drv
building '/nix/store/wgz86ibjy7kqkim5x7j3ypbsqajg0fgd-inputDerivation-effect-docs-pages.drv'...