this derivation will be built:
  /nix/store/r8q2cgcx97si0qldcyrk773crmaj2ql7-inputDerivation-effect-docs-pages.drv
building '/nix/store/r8q2cgcx97si0qldcyrk773crmaj2ql7-inputDerivation-effect-docs-pages.drv'...