var y int
	defer func() {
		c <- y
	}()
	defer setBig(&y, 42, bigBuf{})
	useStackAndCall(i, Goexit)
}

func setBig(p *int, x int, b bigBuf) {
	*p = x
}

// TestDeferPtrsPanic is like TestDeferPtrsGoexit, but it's using panic instead
// of Goexit to run the Defers. Those two are different execution paths
// in the runtime.
func TestDeferPtrsPanic(t *testing.T) {

	// goroutines for test
	"testing.Main(",
	"testing.tRunner(",
	"testing.(*M).",

	// go runtime
	"runtime.goexit",
	"created by runtime.gc",
	"runtime.MHeap_Scavenger",
	"signal.signal_recv",
	"sigterm.handler",
	"runtime_mcall",

	// created by leak checker
	"created by runtime/trace.Start",
	"interestingGoroutines",

	path, name := fn.Pkg().Path(), fn.Name()
	return path == "syscall" && (name == "Exit" || name == "ExitProcess" || name == "ExitThread") ||
		path == "runtime" && name == "Goexit"

func (b *B) launch() {
	// Run the benchmark for a single iteration in case it's expensive.
	n := 1

	// Signal that we're done whether we return normally
	// or by FailNow's runtime.Goexit.
	defer func() {
		b.signal <- b
	}()

	b.runN(n)
	// Run the benchmark for at least the specified amount of time.
	d := *benchTime
	for !b.failed && b.duration < d && n < 1e9 {
		last := n

	MOVW	saveG-8(SP), g
	MOVW	saveR11-4(SP), R11
	RET

// The top-most function running on a goroutine
// returns to goexit+PCQuantum.
TEXT runtime·goexit(SB),NOSPLIT|NOFRAME|TOPFRAME,$0-0
	MOVW	R0, R0	// NOP
	BL	runtime·goexit1(SB)	// does not return
	// traceback from goexit1 must hit code range of goexit
	MOVW	R0, R0	// NOP

// x -> x/1000000, x%1000000, called from Go with args, results on stack.

	MOVL	(g_stack+stack_hi)(AX), AX
	RET

// The top-most function running on a goroutine
// returns to goexit+PCQuantum.
TEXT runtime·goexit(SB),NOSPLIT|TOPFRAME,$0-0
	BYTE	$0x90	// NOP
	CALL	runtime·goexit1(SB)	// does not return
	// traceback from goexit1 must hit code range of goexit
	BYTE	$0x90	// NOP

// Add a module's moduledata to the linked list of moduledata objects. This

			ctx.maxLen = n + 8 // Add additional slack to avoid too many jumps in size.
		}
	}
	go func() {
		// Signal that we're done whether we return normally
		// or by FailNow's runtime.Goexit.
		defer func() {
			b.signal <- true
		}()

		b.runN(1)
	}()
	<-b.signal
	if b.failed {
		fmt.Fprintf(b.w, "%s--- FAIL: %s\n%s", b.chatty.prefix(), b.name, b.output)
		return false
	}

			} else {
				pcBuf[1] = gp.sched.pc
				nstk += 1 + fpTracebackPCs(unsafe.Pointer(gp.sched.bp), pcBuf[2:])
			}
		}
	}
	if nstk > 0 {
		nstk-- // skip runtime.goexit
	}
	if nstk > 0 && gp.goid == 1 {
		nstk-- // skip runtime.main
	}
	id := trace.stackTab[gen%2].put(pcBuf[:nstk])
	return id
}

    sub_test.go:NNN: first this
    sub_test.go:NNN: and now this!
    --- FAIL: subtest calls fatal on parent/#00 (N.NNs)
        testing.go:NNN: test executed panic(nil) or runtime.Goexit: subtest may have called FailNow on a parent test`,
		maxPar: 1,
		f: func(t *T) {
			outer := t
			t.Errorf("first this")
			t.Run("", func(t *T) {
				outer.Fatalf("and now this!")
			})

CALLFN(·call134217728, 134217728)
CALLFN(·call268435456, 268435456)
CALLFN(·call536870912, 536870912)
CALLFN(·call1073741824, 1073741824)

TEXT runtime·goexit(SB), NOSPLIT|TOPFRAME, $0-0
	NOP // first PC of goexit is skipped
	CALL runtime·goexit1(SB) // does not return
	UNDEF

TEXT runtime·cgocallback(SB), NOSPLIT, $0-24
	UNDEF

// gcWriteBarrier informs the GC about heap pointer writes.
//