{ ... }:

let
  /* Returns true if it is being evaluated using restrict-eval, false if not.
     It's more robust than using `builtins.getEnv` since it isn't fooled by
     `env -i`.

     See https://github.com/NixOS/nix/issues/6579 for a description of the
     behavior. Precise cause in the evaluator / store implementation is unclear.

     Type: bool
  */
  inRestrictedEval = builtins.pathExists (toString ./guinea-pig + "/.");
in

{
  inherit inRestrictedEval;
}