… while evaluating derivation 'llvm-binutils-wrapper-21.1.2'
         whose name attribute is located at /home/ross/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:541:13

       … while evaluating attribute 'gnugrep_bin' of derivation 'llvm-binutils-wrapper-21.1.2'

       error: infinite recursion encountered
       at /home/ross/nixpkgs/lib/customisation.nix:429:7:
          428|     // {
          429|       drvPath =
             |       ^
          430|         assert condition;

Bleh