this derivation will be built:
  /nix/store/giihxr42gqwjnz4b75a5xgh9vxmw34i5-inputDerivation-effect-docs-pages.drv
building '/nix/store/giihxr42gqwjnz4b75a5xgh9vxmw34i5-inputDerivation-effect-docs-pages.drv'...