this derivation will be built:
  /nix/store/nmcdmaajbaqlj0wfgz0km8w60h7p3m2z-inputDerivation-effect-docs-pages.drv
building '/nix/store/nmcdmaajbaqlj0wfgz0km8w60h7p3m2z-inputDerivation-effect-docs-pages.drv'...