this derivation will be built:
  /nix/store/5z6ffm6ajnvi9zrl6nr8prfzy5c8p77c-inputDerivation-effect-docs-pages.drv
building '/nix/store/5z6ffm6ajnvi9zrl6nr8prfzy5c8p77c-inputDerivation-effect-docs-pages.drv'...