var (
		respCh           = make(chan *Response, 1)
		errCh            = make(chan error, 1)
		success, failure js.Func
	)
	success = js.FuncOf(func(this js.Value, args []js.Value) any {
		success.Release()
		failure.Release()

		result := args[0]
		header := Header{}
		// https://developer.mozilla.org/en-US/docs/Web/API/Headers/entries

// We want to extend r.Suffix to preserve the failure, working toward
// a suffix that identifies a single change.
func (b *Bisect) search(r *Result) []string {
	// The caller should be passing in a failure result that we diagnose.
	if r.Success {
		b.Fatalf("internal error: unexpected success") // mistake by caller
	}

	// If the failure reported no changes, the target is misbehaving.
	if len(r.MatchIDs) == 0 {

	SWI $SYS_getcontext
	MOVW.CS $0, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·sigprocmask(SB),NOSPLIT,$0
	MOVW how+0(FP), R0	// arg 1 - how
	MOVW new+4(FP), R1	// arg 2 - set
	MOVW old+8(FP), R2	// arg 3 - oset
	SWI $SYS___sigprocmask14
	MOVW.CS $0, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT sigreturn_tramp<>(SB),NOSPLIT|NOFRAME,$0

	if err != nil {
		t.Fatalf("build failure: %s\n%s\n", err, string(out))
	}

	// Check that we did split text sections.
	out, err = testenv.Command(t, testenv.GoToolPath(t), "tool", "nm", exe).CombinedOutput()
	if err != nil {
		t.Fatalf("nm failure: %s\n%s\n", err, string(out))
	}
	if !bytes.Contains(out, []byte("runtime.text.1")) {

				realTest.Error("sequential test was not run")
			}
		},
	}, {
		desc:   "failure in parallel test propagates upwards",
		ok:     false,
		maxPar: 1,
		output: `
--- FAIL: failure in parallel test propagates upwards (N.NNs)
    --- FAIL: failure in parallel test propagates upwards/#00 (N.NNs)
        --- FAIL: failure in parallel test propagates upwards/#00/par (N.NNs)
        `,
		f: func(t *T) {

	// NOTE: we don't immediately check the error, because the failure could be either because
	// the runner failed for some unexpected reason, or because a test case failed, and we
	// cannot easily differentiate these cases. We check if the JSON results file was written,
	// which should only happen if the failure was because of a test failure, and use that
	// to determine the failure mode.

	resultsJSON, jsonErr := os.ReadFile(resultsFile)

	MOVW R8, (R8)
	RET

// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
	MOVW code+0(FP), R0	// arg 1 exit status
	MOVW $SYS_exit, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

// func exitThread(wait *atomic.Uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-4
	MOVW	wait+0(FP), R0
	// We're done using the stack.
	MOVW	$0, R2
storeloop:

	CALL	libc_munmap(SB)
	MOV	$-1, X5
	BNE	X5, X10, 3(PC)
	MOV	$0, X5			// crash on failure
	MOV	X5, (X5)
	RET

TEXT runtime·madvise_trampoline(SB),NOSPLIT,$8
	MOV	8(X10), X11		// arg 2 - len
	MOVW	16(X10), X12		// arg 3 - advice
	MOV	0(X10), X10		// arg 1 - addr
	CALL	libc_madvise(SB)
	// ignore failure - maybe pages are locked
	RET

TEXT runtime·open_trampoline(SB),NOSPLIT,$8

	CALL	libc_munmap(SB)
	CMP	R3, $-1
	BNE	3(PC)
	MOVD	$0, R3			// crash on failure
	MOVD	R3, (R3)
	RET

TEXT runtime·madvise_trampoline(SB),NOSPLIT,$32
	MOVD	8(R3), R4		// arg 2 - len
	MOVW	16(R3), R5		// arg 3 - advice
	MOVD	0(R3), R3		// arg 1 - addr
	CALL	libc_madvise(SB)
	// ignore failure - maybe pages are locked
	RET

TEXT runtime·open_trampoline(SB),NOSPLIT,$32

// See [golang.org/x/tools/cmd/bisect] for details about using the tool.
//
// To be a bisect target, allowing bisect to help determine which of a set of independent
// changes provokes a failure, a program needs to:
//
//  1. Define a way to accept a change pattern on its command line or in its environment.
//     The most common mechanism is a command-line flag.