this derivation will be built:
  /nix/store/cfk7jplihg3gjkd8vq4n5n4zcihh0na6-inputDerivation-effect-docs-pages.drv
building '/nix/store/cfk7jplihg3gjkd8vq4n5n4zcihh0na6-inputDerivation-effect-docs-pages.drv'...