old1 := altBit(z1, i)
		if old != old1 {
			t.Errorf("bitset: inconsistent value for Bit(%s, %d), got %v want %v", z1, i, old, old1)
		}
		z := new(Int).SetBit(z, i, 1)
		z1 := altSetBit(new(Int), z1, i, 1)
		if z.Bit(i) == 0 {
			t.Errorf("bitset: bit %d of %s got 0 want 1", i, x)
		}
		if z.Cmp(z1) != 0 {
			t.Errorf("bitset: inconsistent value after SetBit 1, got %s want %s", z, z1)
		}

}{
	{1, "SIGHUP", "hangup"},
	{2, "SIGINT", "interrupt"},
	{3, "SIGQUIT", "quit"},
	{4, "SIGILL", "illegal instruction"},
	{5, "SIGTRAP", "trace/BPT trap"},
	{6, "SIGIOT", "abort trap"},
	{7, "SIGEMT", "EMT trap"},
	{8, "SIGFPE", "floating point exception"},
	{9, "SIGKILL", "killed"},
	{10, "SIGBUS", "bus error"},
	{11, "SIGSEGV", "segmentation fault"},
	{12, "SIGSYS", "bad system call"},

}{
	{1, "SIGHUP", "hangup"},
	{2, "SIGINT", "interrupt"},
	{3, "SIGQUIT", "quit"},
	{4, "SIGILL", "illegal instruction"},
	{5, "SIGTRAP", "trace/BPT trap"},
	{6, "SIGIOT", "abort trap"},
	{7, "SIGEMT", "EMT trap"},
	{8, "SIGFPE", "floating point exception"},
	{9, "SIGKILL", "killed"},
	{10, "SIGBUS", "bus error"},
	{11, "SIGSEGV", "segmentation fault"},
	{12, "SIGSYS", "bad system call"},

	SIGCONT   = Signal(0x13)
	SIGEMT    = Signal(0x7)
	SIGFPE    = Signal(0x8)
	SIGHUP    = Signal(0x1)
	SIGILL    = Signal(0x4)
	SIGINFO   = Signal(0x1d)
	SIGINT    = Signal(0x2)
	SIGIO     = Signal(0x17)
	SIGIOT    = Signal(0x6)
	SIGKILL   = Signal(0x9)
	SIGPIPE   = Signal(0xd)
	SIGPROF   = Signal(0x1b)
	SIGQUIT   = Signal(0x3)
	SIGSEGV   = Signal(0xb)
	SIGSTOP   = Signal(0x11)

	SIGCONT   = Signal(0x13)
	SIGEMT    = Signal(0x7)
	SIGFPE    = Signal(0x8)
	SIGHUP    = Signal(0x1)
	SIGILL    = Signal(0x4)
	SIGINFO   = Signal(0x1d)
	SIGINT    = Signal(0x2)
	SIGIO     = Signal(0x17)
	SIGIOT    = Signal(0x6)
	SIGKILL   = Signal(0x9)
	SIGPIPE   = Signal(0xd)
	SIGPROF   = Signal(0x1b)
	SIGQUIT   = Signal(0x3)
	SIGSEGV   = Signal(0xb)
	SIGSTOP   = Signal(0x11)

	SIGCKPT     = Signal(0x21)
	SIGCKPTEXIT = Signal(0x22)
	SIGCONT     = Signal(0x13)
	SIGEMT      = Signal(0x7)
	SIGFPE      = Signal(0x8)
	SIGHUP      = Signal(0x1)
	SIGILL      = Signal(0x4)
	SIGINFO     = Signal(0x1d)
	SIGINT      = Signal(0x2)
	SIGIO       = Signal(0x17)
	SIGIOT      = Signal(0x6)
	SIGKILL     = Signal(0x9)
	SIGPIPE     = Signal(0xd)
	SIGPROF     = Signal(0x1b)

    }

    @Override
    public NavigableSet<E> subSet(
        @ParametricNullness E fromElement,
        boolean fromInclusive,
        @ParametricNullness E toElement,
        boolean toInclusive) {
      return forward.subSet(toElement, toInclusive, fromElement, fromInclusive).descendingSet();
    }

    @Override
    public SortedSet<E> subSet(@ParametricNullness E fromElement, @ParametricNullness E toElement) {

	SIGALRM   = Signal(0xe)
	SIGBUS    = Signal(0xa)
	SIGCHLD   = Signal(0x14)
	SIGCONT   = Signal(0x13)
	SIGEMT    = Signal(0x7)
	SIGFPE    = Signal(0x8)
	SIGHUP    = Signal(0x1)
	SIGILL    = Signal(0x4)
	SIGINFO   = Signal(0x1d)
	SIGINT    = Signal(0x2)
	SIGIO     = Signal(0x17)
	SIGIOT    = Signal(0x6)
	SIGKILL   = Signal(0x9)
	SIGLIBRT  = Signal(0x21)
	SIGLWP    = Signal(0x20)

	SIGALRM   = Signal(0xe)
	SIGBUS    = Signal(0xa)
	SIGCHLD   = Signal(0x14)
	SIGCONT   = Signal(0x13)
	SIGEMT    = Signal(0x7)
	SIGFPE    = Signal(0x8)
	SIGHUP    = Signal(0x1)
	SIGILL    = Signal(0x4)
	SIGINFO   = Signal(0x1d)
	SIGINT    = Signal(0x2)
	SIGIO     = Signal(0x17)
	SIGIOT    = Signal(0x6)
	SIGKILL   = Signal(0x9)
	SIGLIBRT  = Signal(0x21)
	SIGLWP    = Signal(0x20)

}{
	{1, "SIGHUP", "hangup"},
	{2, "SIGINT", "interrupt"},
	{3, "SIGQUIT", "quit"},
	{4, "SIGILL", "illegal instruction"},
	{5, "SIGTRAP", "trace/BPT trap"},
	{6, "SIGIOT", "IOT/Abort trap"},
	{7, "SIGEMT", "EMT trap"},
	{8, "SIGFPE", "floating point exception"},
	{9, "SIGKILL", "killed"},
	{10, "SIGBUS", "bus error"},
	{11, "SIGSEGV", "segmentation fault"},
	{12, "SIGSYS", "bad system call"},