anchor.diff:    };
   
     passthru = {
  -    compatibleCoqVersions = v: builtins.elem v [ "8.6" "8.7" ];
  +    compatibleCoqVersions = v: builtins.hasAttr v params;
     };
   
   }
  
positive.code:     "8.8" = {
        version = "1.0";
        rev = "v1.0-8.8";
        sha256 = "129rxsdsf88vjcw0xhm74yax1hmnk6f8n9ksg0hcyyjq1ijddiwa";
      };
  
    }."${coq.coq-version}"
  ; in
  
  stdenv.mkDerivation rec {
  
  
negative.code: { stdenv, fetchFromGitHub, coq }:
  
  let
    params = {
      "8.6" = {
        version = "1.0";
        rev = "v1.0";
  