error:
       … while calling the 'seq' builtin
         at /pwd/in.nix:1:16:
            1| let n = -1; in builtins.seq n (builtins.flakeRefToString {
             |                ^
            2|   type  = "github";

       … while calling the 'flakeRefToString' builtin
         at /pwd/in.nix:1:32:
            1| let n = -1; in builtins.seq n (builtins.flakeRefToString {
             |                                ^
            2|   type  = "github";

       error: negative value given for flake ref attr repo: -1
