{26, "SIGVTALRM", "virtual timer expired"},
	{27, "SIGPROF", "profiling timer expired"},
	{28, "SIGWINCH", "window changed"},
	{29, "SIGIO", "I/O possible"},
	{30, "SIGPWR", "power failure"},
	{31, "SIGSYS", "bad system call"},

func (u *URL) IsAbs() bool {
	return u.Scheme != ""
}

// Parse parses a [URL] in the context of the receiver. The provided URL
// may be relative or absolute. Parse returns nil, err on parse
// failure, otherwise its return value is the same as [URL.ResolveReference].
func (u *URL) Parse(ref string) (*URL, error) {
	refURL, err := Parse(ref)
	if err != nil {
		return nil, err
	}

			t.Skipf("creating and observing contention on runtime-internal semaphores requires GOMAXPROCS >= %d", workers)
		}

		var sem uint32 = 1
		var tries atomic.Int32
		tries.Store(10_000_000) // prefer controlled failure to timeout
		var sawContention atomic.Int32
		var need int32 = 1
		fn := func() bool {
			if sawContention.Load() >= need {
				return false
			}
			if tries.Add(-1) < 0 {
				return false

	}
	if !req.isReplayable() {
		// Don't retry non-idempotent requests.
		return false
	}
	if _, ok := err.(transportReadFromServerError); ok {
		// We got some non-EOF net.Conn.Read failure reading
		// the 1st response byte from the server.
		return true
	}
	if err == errServerClosedIdle {
		// The server replied with io.EOF while we were trying to

	// These are all larger than any real SP.

	// Goroutine preemption request.
	// 0xfffffade in hex.
	stackPreempt = uintptrMask & -1314

	// Thread is forking. Causes a split stack check failure.
	// 0xfffffb2e in hex.
	stackFork = uintptrMask & -1234

	// Force a stack movement. Used for debugging.
	// 0xfffffeed in hex.
	stackForceMove = uintptrMask & -275

		if actual != expected {
			t.Errorf("#%d: Jacobi(%d, %d) = %d, but expected %d", i, test.x, test.y, actual, expected)
		}
	}
}

func TestJacobiPanic(t *testing.T) {
	const failureMsg = "test failure"
	defer func() {
		msg := recover()
		if msg == nil || msg == failureMsg {
			panic(msg)
		}
		t.Log(msg)
	}()
	x := NewInt(1)
	y := NewInt(2)

		}
		var dialed bool
		select {
		case <-dialedc:
			dialed = true
		default:
		}

		if !tt.ok && dialed {
			t.Errorf("For key %q, value %q, transport dialed. Expected local failure. Response was: (%v, %v)\nServer replied with: %s", tt.key, tt.val, res, err, body)
		} else if (err == nil) != tt.ok {
			t.Errorf("For key %q, value %q; got err = %v; want ok=%v", tt.key, tt.val, err, tt.ok)
		}
	}

// messages and errors to standard error.
//
// The -json flag causes download to print a sequence of JSON objects
// to standard output, describing each downloaded module (or failure),
// corresponding to this Go struct:
//
//	type Module struct {
//	    Path     string // module path
//	    Query    string // version query corresponding to this version

		{
			Certificate: [][]byte{cert},
			PrivateKey:  k,
		},
	}
	if _, _, err := testHandshake(t, clientConfig, serverConfig); err != nil {
		t.Fatalf("unexpected failure :%s", err)
	}

// backing array is immutable.
func (b *bucket) stk() []uintptr {
	stk := (*[maxProfStackDepth]uintptr)(add(unsafe.Pointer(b), unsafe.Sizeof(*b)))
	if b.nstk > maxProfStackDepth {
		// prove that slicing works; otherwise a failure requires a P
		throw("bad profile stack count")
	}
	return stk[:b.nstk:b.nstk]
}

// mp returns the memRecord associated with the memProfile bucket b.
func (b *bucket) mp() *memRecord {