pub fn failingDirRename(userdata: ?*anyopaque, old_dir: Dir, old_sub_path: []const u8, new_dir: Dir, new_sub_path: []const u8) Dir.RenameError!void
pub fn failingDirRename(userdata: ?*anyopaque, old_dir: Dir, old_sub_path: []const u8, new_dir: Dir, new_sub_path: []const u8) Dir.RenameError!void { _ = userdata; _ = old_dir; _ = old_sub_path; _ = new_dir; _ = new_sub_path; return error.FileNotFound; }