this derivation will be built:
  /nix/store/26ifi37ffvy4z6b9jgqnalq90w4ivgvr-inputDerivation-effect-docs-pages.drv
building '/nix/store/26ifi37ffvy4z6b9jgqnalq90w4ivgvr-inputDerivation-effect-docs-pages.drv'...