this derivation will be built:
  /nix/store/gi4s7xbj3b7hkvn40jv6qkcxc8518gsa-inputDerivation-effect-docs-pages.drv
building '/nix/store/gi4s7xbj3b7hkvn40jv6qkcxc8518gsa-inputDerivation-effect-docs-pages.drv'...