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