}

func TestIssue17697(t *testing.T) {
	_, err := Parse(nil, bytes.NewReader(nil), nil, nil, 0) // return with parser error, don't panic
	if err == nil {
		t.Errorf("no error reported")
	}
}

func TestParseFile(t *testing.T) {
	_, err := ParseFile("", nil, nil, 0)
	if err == nil {
		t.Error("missing io error")
	}

	var first error
	_, err = ParseFile("", func(err error) {
		if first == nil {

		return true
	case "parser.go.orig":
		return true // permit but should be ignored by ParseDir
	}
	return false
}

func dirFilter(f fs.FileInfo) bool { return nameFilter(f.Name()) }

func TestParseFile(t *testing.T) {
	src := "package p\nvar _=s[::]+\ns[::]+\ns[::]+\ns[::]+\ns[::]+\ns[::]+\ns[::]+\ns[::]+\ns[::]+\ns[::]+\ns[::]+\ns[::]"
	_, err := ParseFile(token.NewFileSet(), "", src, 0)
	if err == nil {