}
	if strings.HasPrefix(cwd, goroot) {
		subdir, err := filepath.Rel(goroot, cwd)
		if err != nil {
			return "", false, err
		}
		return subdir, true, nil
	}

	for _, p := range filepath.SplitList(build.Default.GOPATH) {
		pabs, err := filepath.EvalSymlinks(p)
		if err != nil {
			return "", false, err
		}
		if !strings.HasPrefix(cwd, pabs) {
			continue
		}
		subdir, err := filepath.Rel(pabs, cwd)

			if j != expect {
				b.Fatal("bad count", j, expect)
			}
		}
		for i := 0; i < len(buf); i++ {
			buf[i] = 0
		}
	})
}

type SplitTest struct {
	s   string
	sep string
	n   int
	a   []string
}

var splittests = []SplitTest{
	{"", "", -1, []string{}},
	{abcd, "a", 0, nil},
	{abcd, "", 2, []string{"a", "bcd"}},
	{abcd, "a", -1, []string{"", "bcd"}},

pkg path/filepath, func Match(string, string) (bool, error)
pkg path/filepath, func Rel(string, string) (string, error)
pkg path/filepath, func Split(string) (string, string)
pkg path/filepath, func SplitList(string) []string
pkg path/filepath, func ToSlash(string) string
pkg path/filepath, func VolumeName(string) string
pkg path/filepath, func Walk(string, WalkFunc) error