this derivation will be built:
  /nix/store/3aa8zv0kv7kacn4kgvjqw2yvamcnb4c9-inputDerivation-effect-docs-pages.drv
building '/nix/store/3aa8zv0kv7kacn4kgvjqw2yvamcnb4c9-inputDerivation-effect-docs-pages.drv'...