ctx, span := trace.StartSpan(ctx, "modload.matchPackages")
	defer span.Done()

	m.Pkgs = []string{}

	isMatch := func(string) bool { return true }
	treeCanMatch := func(string) bool { return true }
	if !m.IsMeta() {
		isMatch = pkgpattern.MatchPattern(m.Pattern())
		treeCanMatch = pkgpattern.TreeCanMatchPattern(m.Pattern())
	}

	var mu sync.Mutex
	have := map[string]bool{

		return
	}

	if m.IsLiteral() {
		m.Pkgs = []string{m.pattern}
		return
	}

	match := func(string) bool { return true }
	treeCanMatch := func(string) bool { return true }
	if !m.IsMeta() {
		match = pkgpattern.MatchPattern(m.pattern)
		treeCanMatch = pkgpattern.TreeCanMatchPattern(m.pattern)
	}

	have := map[string]bool{
		"builtin": true, // ignore pseudo-package that exists only for documentation