lib: {
  primops = {
    equal = a: b: a == b;
    fix = _: f: let x = f x; in x;
    fix' = f: let x = f x // { __unfix__ = f; }; in x;
    ignoreOtherArgs = _: _: f: let
      args = lib.trivial.functionArgs f;
      filterFunction = k: _: builtins.hasAttrs k set;
      filteredFunction = s: f (lib.attrsets.filterAttrs filterFunction s);
    in lib.trivial.setFunctionArgs filteredFunction args;
    mergeAttrs = a: b: a // b;
    toAny = _: v: v;
    toTypeUnchecked = _: v: v;
  };
  inherit builtins;
}