for _, fname := range filenames {
			if w := warningsByFilename[fname]; w != nil {
				if fname == "-" {
					_, _ = fmt.Fprint(writer, warningToString(w))
					break
				}
				_, _ = fmt.Fprintf(writer, "%q has warnings: %v\n", fname, warningToString(w))
			}
		}
		return errs
	}
	for _, fname := range filenames {
		if fname == "-" {
			if w := warningsByFilename[fname]; w != nil {