pub fn failingDirDeleteDir(userdata: ?*anyopaque, dir: Dir, sub_path: []const u8) Dir.DeleteDirError!void
pub fn failingDirDeleteDir(userdata: ?*anyopaque, dir: Dir, sub_path: []const u8) Dir.DeleteDirError!void { _ = userdata; _ = dir; _ = sub_path; return error.FileNotFound; }