self: super: { hydra-unstable = super.hydra-unstable.overrideAttrs (oldAttrs: rec { patches = (oldAttrs.patches or []) ++ map super.fetchpatch [ { meta.description = "Fix unhelpful error messages in aggregate jobs."; url = "https://github.com/NixOS/hydra/pull/825.diff"; sha256 = "sha256-L8SWhPHOxuzYpeeu6WuxXKsWo6e687IYIrxzwMJQses"; } ]; }); }