SO_DONTROUTE                      = 0x10
	SO_DONTTRUNC                      = 0x2000
	SO_ERROR                          = 0x1007
	SO_KEEPALIVE                      = 0x8
	SO_LABEL                          = 0x1010
	SO_LINGER                         = 0x80
	SO_LINGER_SEC                     = 0x1080
	SO_NKE                            = 0x1021
	SO_NOADDRERR                      = 0x1023
	SO_NOSIGPIPE                      = 0x1022

	RTV_SPIPE                     = 0x10
	RTV_SSTHRESH                  = 0x20
	RT_AWARE                      = 0x1
	RUSAGE_CHILDREN               = -0x1
	RUSAGE_SELF                   = 0x0
	SCM_RIGHTS                    = 0x1010
	SCM_TIMESTAMP                 = 0x1013
	SCM_UCRED                     = 0x1012
	SHUT_RD                       = 0x0
	SHUT_RDWR                     = 0x2
	SHUT_WR                       = 0x1

    assertThat(parse("http://[2001:db8::1]/").host).isEqualTo("2001:db8::1")
    assertThat(parse("http://[2001:db8:0:0:0:0:2:1]/").host).isEqualTo("2001:db8::2:1")
    assertThat(parse("http://[2001:db8:0:1:1:1:1:1]/").host).isEqualTo("2001:db8:0:1:1:1:1:1")
    assertThat(parse("http://[2001:db8:0:0:1:0:0:1]/").host).isEqualTo("2001:db8::1:0:0:1")
    assertThat(parse("http://[2001:0:0:1:0:0:0:1]/").host).isEqualTo("2001:0:0:1::1")

	SO_NOSIGPIPE                      = 0x800
	SO_NO_DDP                         = 0x8000
	SO_NO_OFFLOAD                     = 0x4000
	SO_OOBINLINE                      = 0x100
	SO_PEERLABEL                      = 0x1010
	SO_PROTOCOL                       = 0x1016
	SO_PROTOTYPE                      = 0x1016
	SO_RCVBUF                         = 0x1002
	SO_RCVLOWAT                       = 0x1004

	SO_NOSIGPIPE                      = 0x800
	SO_NO_DDP                         = 0x8000
	SO_NO_OFFLOAD                     = 0x4000
	SO_OOBINLINE                      = 0x100
	SO_PEERLABEL                      = 0x1010
	SO_PROTOCOL                       = 0x1016
	SO_PROTOTYPE                      = 0x1016
	SO_RCVBUF                         = 0x1002
	SO_RCVLOWAT                       = 0x1004

	SO_NOSIGPIPE                      = 0x800
	SO_NO_DDP                         = 0x8000
	SO_NO_OFFLOAD                     = 0x4000
	SO_OOBINLINE                      = 0x100
	SO_PEERLABEL                      = 0x1010
	SO_PROTOCOL                       = 0x1016
	SO_PROTOTYPE                      = 0x1016
	SO_RCVBUF                         = 0x1002
	SO_RCVLOWAT                       = 0x1004

	RTV_SPIPE                     = 0x10
	RTV_SSTHRESH                  = 0x20
	RT_AWARE                      = 0x1
	RUSAGE_CHILDREN               = -0x1
	RUSAGE_SELF                   = 0x0
	SCM_RIGHTS                    = 0x1010
	SCM_TIMESTAMP                 = 0x1013
	SCM_UCRED                     = 0x1012
	SHUT_RD                       = 0x0
	SHUT_RDWR                     = 0x2
	SHUT_WR                       = 0x1

	tg.t.Helper()
	if st, err := os.Stat(path); err != nil {
		if !os.IsNotExist(err) {
			tg.t.Log(err)
		}
		tg.t.Fatal(msg)
	} else {
		if runtime.GOOS != "windows" && st.Mode()&0111 == 0 {
			tg.t.Fatalf("binary %s exists but is not executable", path)
		}
	}
}

// isStale reports whether pkg is stale, and why
func (tg *testgoData) isStale(pkg string) (bool, string) {
	tg.t.Helper()

			uid = 0
		}
	} else {
		uid = Getuid()
	}

	if uid == 0 {
		if mode&1 == 0 {
			// Root can read and write any file.
			return nil
		}
		if st.Mode&0111 != 0 {
			// Root can execute any file that anybody can execute.
			return nil
		}
		return EACCES
	}

	var fmode uint32
	if uint32(uid) == st.Uid {
		fmode = (st.Mode >> 6) & 7
	} else {

}

// Test if this value can encoded as a mask for a rlwinm like
// operation.  Masks can also extend from the msb and wrap to
// the lsb too.  That is, the valid masks are 32 bit strings
// of the form: 0..01..10..0 or 1..10..01..1 or 1...1
func isPPC64WordRotateMask(v64 int64) bool {
	// Isolate rightmost 1 (if none 0) and add.
	v := uint32(v64)
	vp := (v & -v) + v
	// Likewise, for the wrapping case.
	vn := ^v