fn progressParentFile(userdata: ?*anyopaque) std.Progress.ParentFileError!File
fn progressParentFile(userdata: ?*anyopaque) std.Progress.ParentFileError!File { const ev: *Evented = @ptrCast(@alignCast(userdata)); ev.scan_environ.once(ev, &scanEnviron); return ev.environ.zig_progress_file; }