this derivation will be built:
  /nix/store/l4bz0afdq7aibwvcwaaw1hk6fkrqwssj-inputDerivation-effect-docs.drv
building '/nix/store/l4bz0afdq7aibwvcwaaw1hk6fkrqwssj-inputDerivation-effect-docs.drv'...