this derivation will be built:
  /nix/store/7r9ihzggq71fpbdw85ik9syj24qwk6kh-inputDerivation-effect-docs-pages.drv
building '/nix/store/7r9ihzggq71fpbdw85ik9syj24qwk6kh-inputDerivation-effect-docs-pages.drv'...