this derivation will be built:
  /nix/store/xsisrkqjrg7gnya8lqhr1ysal3xgqfmn-inputDerivation-effect-docs-pages.drv
building '/nix/store/xsisrkqjrg7gnya8lqhr1ysal3xgqfmn-inputDerivation-effect-docs-pages.drv'...