all := strings.HasPrefix(pattern, "all:")
		if all {
			glob = pattern[len("all:"):]
		}
		// Check pattern is valid for //go:embed.
		if _, err := pathpkg.Match(glob, ""); err != nil || !validEmbedPattern(glob) {
			return nil, nil, fmt.Errorf("invalid pattern syntax")
		}

		// Glob to find matches.
		match, err := fsys.Glob(str.QuoteGlob(str.WithFilePathSeparator(pkgdir)) + filepath.FromSlash(glob))