// (4) Organize batchCursors in a min-heap, ordered by the timestamp of the next event for each M.
	// (5) Try to advance the next event for the M at the top of the min-heap.
	//   (a) On success, select that M.
	//   (b) On failure, sort the min-heap and try to advance other Ms. Select the first M that advances.
	//   (c) If there's nothing left to advance, goto (1).
	// (6) Select the latest event for the selected M and get it ready to be returned.

// not errors embedded in structs, slices, maps or other data structures that
// are processed by the [encoding/json] package.
//
// Second, an encoding failure does not cause Handle to return an error.
// Instead, the error message is formatted as a string.
//
// Each call to Handle results in a single serialized call to io.Writer.Write.

		// Run some extra validation.
		if !t.Failed() && extra != nil {
			extra(t, tb, errBuf.Bytes(), stress)
		}

		// Dump some more information on failure.
		if t.Failed() && onBuilder {
			// Dump directly to the test log on the builder, since this
			// data is critical for debugging and this is the only way
			// we can currently make sure it's retained.

// tries is the initial number of iterations.
func checkLinear(typ string, tries int, f func(n int)) {
	// Depending on the machine and OS, this test might be too fast
	// to measure with accurate enough granularity. On failure,
	// make it run longer, hoping that the timing granularity
	// is eventually sufficient.

	timeF := func(n int) time.Duration {
		t1 := time.Now()
		f(n)
		return time.Since(t1)
	}

	t0 := time.Now()

				}
				return nil, fmt.Errorf("insecure URL: %s", url.Redacted())
			}
		case "":
			if security != Insecure {
				panic("should have returned after HTTPS failure")
			}
		default:
			if cfg.BuildX {
				fmt.Fprintf(os.Stderr, "# get %s: unsupported\n", url.Redacted())
			}
			return nil, fmt.Errorf("unsupported scheme: %s", url.Redacted())
		}

	return 0, errors.New("fake write failure")
}

func TestClientWriteError(t *testing.T) {
	w := &writeCrasher{done: make(chan bool)}
	c := NewClient(w)
	defer c.Close()

	res := false
	err := c.Call("foo", 1, &res)
	if err == nil {
		t.Fatal("expected error")
	}
	if err.Error() != "fake write failure" {
		t.Error("unexpected value of error:", err)
	}
	w.done <- true

// If we are running multiple test targets, print a final "FAIL"
// in case a failure in an early package has already scrolled
// off of the user's terminal.
// (See https://golang.org/issue/30507#issuecomment-470593235.)
//
// In JSON mode, we need to maintain valid JSON output and
// we assume that the test output is being parsed by a tool
// anyway, so the failure will not be missed and would be

	return 0, UnknownFileError(path)
}

/*
 * Errors
 */

// UnknownFileError represents a failure to find the specific file in
// the symbol table.
type UnknownFileError string

func (e UnknownFileError) Error() string { return "unknown file: " + string(e) }

// UnknownLineError represents a failure to map a line to a program
// counter, either because the line is beyond the bounds of the file

	}

	if cpid != cpgrp {
		t.Fatalf("Child's process group is not the child's process ID")
	}

	cmd.Stop()

	// This call fails on darwin/arm64. The failure doesn't matter, though.
	// This is just best effort.
	syscall.Tcsetpgrp(ttyFD, fpgrp)
}

func TestForegroundSignal(t *testing.T) {
	tty, err := os.OpenFile("/dev/tty", os.O_RDWR, 0)
	if err != nil {

retry:
	var n uint32 = 1
	r := port_getn(portfd, &events[0], uint32(len(events)), &n, wait)
	e := errno()
	if r < 0 && e == _ETIME && n > 0 {
		// As per port_getn(3C), an ETIME failure does not preclude the
		// delivery of some number of events.  Treat a timeout failure
		// with delivered events as a success.
		r = 0
	}
	if r < 0 {
		if e != _EINTR && e != _ETIME {