this derivation will be built:
  /nix/store/ia1m2wr6px72k1ci5x4rdixwpwhllm9p-inputDerivation-effect-docs-pages.drv
building '/nix/store/ia1m2wr6px72k1ci5x4rdixwpwhllm9p-inputDerivation-effect-docs-pages.drv'...