this derivation will be built:
  /nix/store/r9ibg6sxmggiwhwyz6qs78q51iy2wya5-inputDerivation-effect-docs.drv
building '/nix/store/r9ibg6sxmggiwhwyz6qs78q51iy2wya5-inputDerivation-effect-docs.drv'...